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Showing 167 results for Type of Study: Research
Soheila Afkar, Faranak Hadi, Ali Ashraf Jafari,
Volume 8, Issue 2 (3-2022)
Abstract
Festuca is one of the largest genera of the grass family, which has more than 600 species with different ploidy levels. The aim of this study was to estimate the genetic diversity within 22 populations of three species of Festuca (Festuca arundinacea, F.rubra and F.ovina) using a seed storage protein electrophoresis pattern. These species showed a significant variation in the number of protein bands from 5-13. The highest number of bands was found in G17 (F.rubra) and the lowest number of protein bands was in G5 (F.ovina). Band number 14 was only observed in G3. It is suggested that this band can be considered as a specific band for the identification of this genotype. According to the results of AMOVA analysis, there is a high level of genetic diversity within the species rather than between species that can be due to the out-crossing nature of this genus. According to observed differences for variation parameters among the three studied species, it is concluded that they have dissimilar genetic structures. The results of cluster analysis based on seed storage protein profiles in evaluated genotypes using Euclidean distance matrix and UPGMA method showed four groups. The lowest similarity coefficient was between G14 and G15 (F.arundinacea) with G6 (F.ovina). Hence, it is suggested that they evolved from a different evolutionary process and it is suggested to use them as the parents of new synthetic varieties. The observed diversity in the seed protein pattern in the three species of Festuca, can be explained by allogamy-induced-heterozygosity, species difference or population collection from various regions.
Shahla Hosseini, Mohammad Reza Rahgozar, Hedieh Badakhshan,
Volume 8, Issue 2 (3-2022)
Abstract
Genus Allium L. contains very taxonomically complex sections, especially the subgenus Melanocrommyum. The systematic position of the species in each section has been revised many times over time. In the present study, the relationship between 32 ecotypes belonging to 10 different species of Allium was investigated using ISSR markers. The nine primers used produced 166 polymorphic bands (average 18 bands per primer). Among the primers used, ISSR873 primer with 27 bands made the most, and ISSR4 primer with two bands had the lowest polymorphic bands. The PIC of the markers ranged from 0.04 to 0.43. Cluster analysis by UPGMA method based on molecular markers divided the studied ecotypes into four groups. The clustering and principal coordinate analysis results showed that most morphologically similar species were grouped in closed clusters. According to Dice similarity coefficient, the highest percentage of similarity was shown between Allium stipitatum and Allium saralicum ecotypes (72 percent) from the Melanocrommyum subgenus, and the lowest similarity was obtained between Allium tripedale and Allium iranicum ecotypes (12 percent). The ecotypes with the lowest similarity percentage belong to the subgenus Allium and Nectaroscordum, which are placed in separate clusters. Based on the results, the ecotypes of Pseudoprason, Melanocrommyum, and Procerallium sections showed the highest affinity. In general, it can be concluded that ISSR markers are useful for classifying Allium species and have sufficient potential for phylogenetic studies of species. In addition, due to significant genetic diversity among the studied ecotypes of wild Allium species, this diversity can be used in future breeding programs of crop.
Reza Mir Derikvand, Seyede Sajad Sohrabi, Seyyed Mohsen Sohrabi, Kamran Samiei,
Volume 8, Issue 2 (3-2022)
Abstract
Kaveh Sadeghi, Mohammadhadi Pahlevani, Mohsen Esmeilzadeh Moghaddam, Khalil Zaynali Nezhad,
Volume 8, Issue 2 (3-2022)
Abstract
Identifying selection indices is the most important step of a breeding project that aims to improve grain yield. The definition of the selection index is usually done by evaluating the variables in multivariate statistical methods. In the present study, the relationship between grain yield and its components in bread wheat genotypes was determined by multivariate statistical methods. The experiment was conducted in a randomized complete block design with 3 replications in the research farm of Gorgan University of Agricultural Sciences and Natural Resources in the 2018-19 crop years. Ten commercial cultivars of bread wheat along with their offspring from direct and inverse crosses in a dialysis arrangement were evaluated for morphological and phenological traits, especially grain yield and its components. The results of genotypic and phenotypic correlation coefficients showed a positive and significant correlation (at 1% probability level) between grain yield and spike length, spike weight, number of fertile tillers, number of seeds per spike, number of spikes per spike, 1000-seed weight, biological yield and harvest index. Based on the results of stepwise regression analysis, biological yield, harvest index, number of grains per main spike and main spike weight were entered into the regression model, respectively, and explained a total of 98% of the variation in grain yield. Based on the results of path analysis, biological yield had the highest direct effect on grain yield. After biological yield, the most direct effect on grain yield was related to the weight of main spike. Also, by considering eigenvalues greater than one in factor analysis, 8 hidden factors were identified that explained a total of 75.18% of the data changes. In general, it can be concluded that biological yield, harvest index, number of seeds per spike and weight of spike compared to other traits can be used as appropriate indicators in breeding programs to select high-yield genotypes in field conditions. Genotypes Alo, Ehsan♂ × Gonbad♀ and Ehsan had the highest value for the studied traits, which can be used in future breeding researches.
Ahmad Kaab Omeyr, Payam Pourmohammadi, Abdolali Gilani, Khalil Alami-Saeid, Mohammad Fakhari,
Volume 8, Issue 2 (3-2022)
Abstract
Various strategies have been developed to reduce water consumption in rice cultivation, including rice cultivation in water-saturated soil, drying and wetting of the soil (periodic irrigation), and aerobic rice cultivation. In this study, in order to identify and grouping rice cultivars suitable for aerobic cultivation, 34 cultivars of native and improved rice cultivars were selected and evaluated. Factor analysis based on principal components analysis based on all traits showed that 6 factors were extracted with special values of more than one. These 6 factors, after the Varimax rotation, justify the 6 main and independent factors, justifying 78.08% of the total variation. In the first harvest, cluster analysis using WARD method, cultivars were grouped into 4 groups, which cluster 3 being the largest cluster. Discriminant analysis of first harvest, showed that all cultivars were grouped correctly. In canonical discriminant the first two canonical functions with eigenvalues greater than one explained a total of 88.9% of the variance. In cluster analysis based on the average of the data obtained from Raton product, genotypes were divided into two different groups. The genotypes of the first group were higher than the genotypes of the second group in terms of yield and yield components and were introduced as superior genotypes. Heritability with genetic improvement for leaf area duration, number of seedling (grown plants), number of spikes per unit area, number of full seeds and degree of maturity showed that these traits can be transferred to hybrid offspring and selections based on these traits are effective.
Ali Barzgari, Saeed Malekzade Shafaroudi, Saeed Khavari Khorasani, Farajollah Shahriari Ahmadi,
Volume 8, Issue 2 (3-2022)
Abstract
In breeding programs determination of gene effects and general and specific combining ability for screening of test crosses is necessary. In order to estimate the genetic variance components and the general and specific combining ability of sweet corn lines, an experiment was conducted using 8 sweet corn S6 inbred lines (including 4 maternal and 4 paternal lines) by line × tester mating design in 2019, at the Agricultural and Natural Resources Research and Education Center of Khorasan Razavi Province, Mashhad, Iran. The obtained test cross hybrids were evaluated in a randomized complete block design with 3 replications in 2020. The results of line, tester and line × tester analysis for most of measured traits showed significant differences (p < 0.05). The σ2gca/σ2sca ratio for grain yield was equal to 0.1, showed that while both additive and dominance effects play a role in controlling this trait, but dominance effect was higher. The results for general combining ability of L3 and T1 lines showed positive and significant GCA effect for grain yield. Also, the specific combining ability of grain yield showed that T4 × L2, T1 × L3 and T3 × L1 had the highest SCA rate. In this study, in terms of grain yield, T1 × L3, T4 × L2 and T1 × L4 with 33.96, 30.47 and 27.85 tons per hectare had the highest green ear yield, respectively. These combinations can be as the hybrids with high yield potential in advanced breeding programs for release of new sweet corn varieties.
Shahnoush Nayeri, Bahram Baghban Kohnehrouz,
Volume 8, Issue 2 (3-2022)
Abstract
Black poplar (Populus× euramericana Dode Guinier) is an industrially important tree with broad applications in wood and paper, biofuel and cellulose-based industries as well as plant breeding programs and soil phytoremediation approaches. Here, we have focused on development of direct shoot regeneration and Agrobacterium-mediated transformation protocols using the in vitro internodal stem tissue from hybrid black poplar. To obtain efficient plant regeneration, the internodal stem explant was cultured on SIM and RIM medium containing different concentrations of BAP × IBA and IBA × NAA, respectively. The crucial factors involved in genetic transformation have been evaluated to achieve Agrobacterium-mediated transformation protocol. We achieved fast and highly potential shoot regeneration from the explants cultured on SIM containing BAP 0.5mg/L and IBA 0.05mg/L with 28.57 shoots per explant. The normal roots developed from the plantlets cultured on RIM containing IBA 0.1mg/L and NAA 0.05mg/L and 100% of the regenerated plants were hardened and transferred to the greenhouse condition. Our results indicated that 0.5 µM Basta® could provide a stringent selection for the inhibition of non-transformed cells. We also obtained the highest transformation efficiency of 93.33% through preculturing the explants for 6 days and dipping into IM medium containing A. tumefaciens strain LBA4404 (OD600 = 0.6) and 100 µM AS for 10 min. The Southern blotting analysis, RT-PCR and GUS histochemical analysis were confirmed the stable single or two-copies gus transgenesis in the genomic DNA and its expression in the selected T0 generation plants. The findings indicate that these protocols could be used for genetic engineering approaches in hybrid black poplar.
Rizan Elyasi, Mohammad Majdi, Abdolbaset Azizi,
Volume 8, Issue 2 (3-2022)
Abstract
Black cumin (Nigella sativa) is a medicinal plant of the Ranunculacea family which raised attention due to its pharmaceutical properties. Medical significance of N. sativa mainly attributed to its oxygenated monoterpenes which are biosynthesized via the methyl erythritol phosphate (MEP) pathway located in plastids. In this study, the essential oil components of leaves, flowers, and developmental stages of seed including half black seeds, soft black seeds, and hard black seeds were analyzed in N. sativa. Whereas no terpene was detected in flowers and leaves, seeds were found to be the major site of biosynthesis and accumulation of terpenes, and the amount of terpene compounds changed during seed maturation. The essential oil consists of monoterpenes (more than 99%) and sesquiterpenes (less than 1%). In order to improve our understanding of monoterpene metabolism, the partial sequence of a hypothetical monoterpene synthase (NsTPS2) was isolated from N. sativa plant using RACE-PCR technique. This monoterpene synthase was identified from RNA sequencing data from soft black seeds. Except of the highly conserved DDXXD motif in NsTPS2 which is necessary to validate monoterpene synthases, no other conserved regions of other identified monoterpene synthases were observed. Dendrogram analysis revealed that NsTPS2 had the highest homology with a terpene synthase (72.89%) from Aconitum carmichaelii and these two sequences were grouped in the same group. Nigella sativa and Aconitum carmichaelii both belong to the Ranunculacea family. This indicates that the genetic information of plants of the Ranunculacea family can be used to isolate different monoterpene synthase. The results of this research can be useful in genetic manipulation and metabolic engineering of Nigella sativa.
Amir Gholizadeh, Hassan Amiri Oghan, Valiollah Rameeh, Kamal Payghamzadeh, Behnam Bakhshi, Bahram Alizadeh, Seyed Alireza Dalili, Shahriar Kia, Farnaz Shariati,
Volume 9, Issue 1 (9-2022)
Abstract
Genetic diversity is key to breeding programs and increasing selection efficiency. In this study, 19 promising advanced lines (F7 generation) along with two cultivars, Dalgan and, RGS003 were evaluated in a randomized complete block design with three replications in three experimental field stations (Gorgan, Sari and, Zabol) during the 2020–2021 growing season. The highest phenotypic and genotypic coefficient of variations was found for number of lateral branches and number of pods per plant, respectively. The highest broad sense heritability was estimated for days to end of flowering, and days to start of flowering and the lowest broad sense heritability was estimated for the plant height. The genotypes G16, G18, G15, G1, G2, G5, and G20 with a higher SIIG values as well as a higher seed yield above average were introduced as superior genotypes with respect to yield and other agronomic traits. Therefore, these genotypes can be used for further testing, including adaptation tests. Also, the results of factor analysis and genetic correlation coefficients indicated a positive relationship between number of lateral branches, number of pods per plant and number of seeds per pod with seed yield and seed yield. Generally, it can be concluded that number of lateral branches, number of pods per plant and number of seeds per pod traits could be used as the appropriate criteria to select for increasing seed yield in rapeseed breeding programs.
Elina Nazari Khakshoor, Amin Azadi, Peyman Fourozesh, Alireza Etminan, Eslam Majidi Hervan,
Volume 9, Issue 1 (9-2022)
Abstract
Salinity stress falls into the major environmental factors that limit the production of various crops, including wheat. An effective approach to reducing the impacts of stress is the production of new salinity-tolerant cultivars. Accordingly, identifying effective genes and molecular mechanisms responsible for salinity tolerance is an essential step for breeding programs. In this investigation, a population of F12 recombinant inbred lines (RIL) comprising 186 genotypes was studied to identify the loci that control some physiological traits and element concentrations in the wheat seedling stage under salinity stress. Totally, 12 quantitative traits loci (QTLs) were identified for wet weight, dry weight, length, and sodium and potassium contents using the composite interval mapping (CIM) analysis. Most of the identified QTLs were located on chromosomes B and D. A gene ontology (GO) analysis specified candidate genes in QTL regions. However, it is noteworthy that candidate genes need confirmation using marker-assisted identification. The prioritization of genes resulted in determining 3486 candidate genes in 19 GO phrases (including eight biological processes). These genes are involved in the processes of glutathione metabolism, L-phenylalanine catabolism, cytoplasmic translation, auxin-activated signaling pathway, transcriptional regulation, DNA-patterning, protoporphyrinogen IX, cell wall organization and genesis, xyloglucan tRNA metabolism, protein glycosylation, pigment biosynthesis, etc. GO may be introduced for identifying novel CGs in which the associated QTL is responsible for complicated traits.
Mitra Khademi, Marzih Varasteh-Shams, Farhad Nazarian-Firouzabadi,
Volume 9, Issue 1 (9-2022)
Abstract
Hairy and adventitious roots are efficient systems for expressing recombinant proteins. In the present study, the amount of DrsB1-CBDAvr4 recombinant protein in hairy and adventitious root systems was compared. To this end, the effect of different factors on the optimization of culture conditions to obtain adventitious and hairy roots was evaluated in three separate experiments by assessment of biomass production in T1 transgenic plants expressing DrsB1-CBDAvr4 recombinant protein. The efficacy of Agrobacterium rhizogenesis in producing hairy roots was ensured using rolC gene specific primers. The insertion of DrsB1-CBDAvr4 recombinant peptide transgene in the genome of hairy and adventitious roots was confirmed by PCR analysis. Also, the level of DrsB1-CBDAvr4 protein was measured in hairy and adventitious roots by ELISA analysis. Analysis of the variance of data showed that the highest number of roots and the longest roots were obtained in MS media supplemented with 1 mg/L NAA and 0.5 mg/L IBA. The results of adventitious root biomass showed that liquid MS medium containing 1 mg/L of NAA hormone had a significant effect (P <0.01) on biomass production. More biomass was obtained in MS medium supplemented with 1mg/L NAA, whereas a lower fresh and dry weight was obtained in a 1/4 MS medium with no NAA. The results also showed that ATCC15834 strain with MS media supplemented with 3% sucrose, 10 minutes inoculation time was high efficiency to induce hairy roots in tobacco plants. The results of ELISA analysis showed that clones obtained from both roots showed a significant difference in terms of total protein content. The amount of recombinant protein from hairy roots was much higher than that of adventitious roots.
Seyede Sharare Arianezhad, Hamid Hamid Najafi Zarini, Mehdi Ghaffari, Gholamali Ranjbar,
Volume 9, Issue 1 (9-2022)
Abstract
This research was carried out to estimate the genetic variance components for sunflower fatty acids in two separate optimum and drought stressed conditions in Karaj during 2020 and 2021 growing seasons. The plant materials consisted of 12 hybrids derived from crossing of four restorer lines by three cytoplasmic male sterile lines (Testers) that were evaluated in two separate experiments as randomized complete block design with three replications. Drought stress made a reduction in oil yield (34 percent), oil content (six percent), stearic acid (4.7 percent) and oleic acid (10.6 percent) and an increase in palmitic acid (12 percent) and linoleic acid (2.8 percent). Line × tester interaction effect had a major role in explanation of the variance of the hybrids in terms of fatty acid content in both conditions, indicating the critical role of non-additive effects in genetic control of these traits. Under optimum irrigation, oil yield, oil content and stearic acid content were under control of both additive and dominant gene action and palmitic, oleic and linoleic acids were under control of dominant gene action. Under drought stress, except oil content which was under control of additive effects, all the other traits were under control of dominant gene action. According to the results of this study, fatty acid composition of sunflower was under control of non-additive genetic effects and the crossing-based methods and hybrid breeding could be used for improvement of sunflower in terms of fatty acid composition.
Jamshid Moradpour, Hadi Ahmadi, Mahmoud Bagheri, Daryoush Goudarzi,
Volume 9, Issue 1 (9-2022)
Abstract
Eggplant (Solanum melongena L.) has a high genetic variation in Iran and there are many landraces of this crop in Iran. In the present study, 15 superior genotypes of eggplant which were selected from Minab landraces accompanying two superior mother landraces (totally 17 lines) were studied for two successive years in three regions of Iran including Minab, Karaj and Jiroft. The experiment was conducted in Randomized complete block design with three replications. Finally, total yield of both years was measured and the combined analysis was done and the best line(s) for different climates were introduced using evaluation the stability of the lines via AMMI and GGE biplot procedures. Based on the results of means comparison of yield in the studied lines in each region from average of two years, GHE12 line in Minab region, SA13 line in Jiroft region and AM4, SA15 and SA5 lines in Karaj region have higher fruit yield than the other lines. Based on the results of yield comparison of the examined genotypes in each region from the average of two years of testing, GHE12 genotype in Minab region, SA13 genotype in Jiroft region and AM4, SA15 and SA5 genotypes in Karaj region had acceptable yield compared to other genotypes. However, according to the results of special adaptability and stability analysis, Y genotype for Minab region, SA13 genotype for Jiroft region and AM4 genotype for Karaj region are recommended
Alireza Asghari Mirak, Seyed Siamak Alaviakia, Seyed Abolghasem Mohammadi,
Volume 9, Issue 1 (9-2022)
Abstract
Henbane has a high medicinal value due to the presence of hyoscyamine and scopolamine alkaloids. Improving the quality and quantity of henbane alkaloids using modern breeding methods requires evaluating the genetic diversity. The genetic diversity of henbane has been investigated using morphological, biochemical and molecular markers in several studies and the superiority of molecular markers over other markers has been proven. To this end, in 2018, the genetic diversity of 96 henbane genotypes collected from the habitats of northwest Iran was investigated using IRAP and REMAP molecular markers. For IRAP markers, out of 36 possible combinations obtained from eight LTR primers, seven combinations had a fine and scalable amplification. In the REMAP technique, the combination of 11 ISSR primers with eight LTR primers was used, and 12 combinations could be scored out of 88 possible combinations. The average amount of polymorphic information for IRAP and REMAP markers was 0.30 and 0.32, respectively, and the average marker index for these two markers was estimated as 2.59 and 2.47. Based on these criteria, REMAP marker was more efficient than IRAP in estimating the genetic diversity of henbane. In the analysis of molecular variance using IRAP and REMAP markers, intra-population variability was estimated to be higher than inter-population, which indicates the high diversity of these populations in northwestern Iran. Cluster analysis based on IRAP marker failed to separate species and populations, but REMAP marker was able to separate H. pusillus and H. reticulatus species to a high degree. A high shannon index in this research suggests that IRAP and REMAP retrotransposon markers resulted in a high genetic diversity within henbane populations with a high insertion in the genome of henbane populations.
Fatemeh Keykha Akhar, Abdolreza Bagheri, Nasrin Moshtaghi, Masoud Fakhrfeshani,
Volume 9, Issue 1 (9-2022)
Abstract
have been bred with altered flower color using genetic engineering approaches. One of the most effective applications is the reduction of flower pigments by suppression of involved enzymes in their biosynthesis pathways. RNA interference (RNAi) has provided an effective tool for the knock down of genes involved in the production of flower pigments. In this study, a chi-RNAi construct was designed for chalcone isomerase (chi) gene to transform Petunia plants. Transgenic lines in one phenotype showed 5.6 fold reduction in chi expression in comparison to the control. Chalcone and naringenin were also extracted and quantified. A 24% reduction in naringenin content was obvious in all transgenic lines. Generally, the results of this research showed that RNAi technology can be used as an efficient method for silencing the flower pigments in petunia. In addition, the chalcone isomerase gene was identified as one of the effective genes in anthocyanin biosynthesis pathway in Petunia plants which is involved in the production of color in these plants; hence, chi gene silencing resulted in clear phenotypic alterations in this plant.
Razieh Ghorbani, Raheleh Ghasemzadeh, Hadi Alipour,
Volume 9, Issue 1 (9-2022)
Abstract
In order to identify loci controlling seedling morpho-physiologic characteristics in 88 bread wheat cultivars, a greenhouse experiment based on simple alpha lattice was conducted under both normal and 120 mM (12 ds/m) salt stress condition of the Faculty of Agriculture, Urmia University in 2020-2021 cropping season. Chlorophyll a, b and carotenoid content, proline, plant fresh and dry weight, plant height and leaf relative water content (RWC), Na+, K+ and K+/Na+ concentrations were measured. After genotyping by sequencing with Ion Torrent technology and removal of SNPs with more than 20% of missing data and minor allele frequency less than 5%, a total of 5869 SNP markers were identified. Based on association mapping with the mixed linear model (MLM) method, a total of 25 marker-trait associations were detected under normal conditions. The A and D genomes had the highest and lowest number of significant marker-trait associations (MTAs). Among the studied traits under normal conditions, chlorophyll a had the highest number of MTAs on 1A, 3B, 3D, 5B, 7A chromosomes with eight MTAs. A total of 21 MTAs were identified under salt stress conditions which the genome B and D had the highest and lowest number of MTAs, respectively. Five MTAs were identified for plant fresh weight, which were located on chromosomes 4A and 6B. The results of this study provide valuable information about the loci associated with the studied traits, which can be used in marker assisted selection in wheat breeding programs after confirmation in biparental populations and additional experiments.
Samira Karimi, Maghsoud Pazhouhandeh, Kambiz Azizpour,
Volume 9, Issue 1 (9-2022)
Abstract
Transgenic plants and their products are being developed day by day due to their improved characteristics, and it is necessary to evaluate the safety of these plants before releasing them. Hence, the importance of the issue of biosafety of transgenic plants and the use of their products has led the regulatory agencies to create some laws called substantial equivalence. based on that, the essential nutrients of transgenic plants are examined and compared with the control. The present study aimed to compare the transgenic potato line F (salinity-resistant) with non-transgenic Agria cultivar plants. The salt resistant potato line was produced by transferring Arabidopsis SOS3 gene to potato (Agria variety) and its resistance was confirmed. First, the presence of AtSOS3 gene in F-line plants was confirmed and then the substantial equivalent experiments were performed by comparing the production of proline, soluble sugars, carotenoids and chlorophylls a and b, the relative expression of Catalase1 (CAT1) and AtSOS3 gene between F and non-transgenic WT Agria plants. Based on evaluations of physiological traits and some metabolites (proline content, soluble sugars, carotenoids and chlorophylls a and b) and morphological traits (plant height, dry and fresh weight of plant) between line F and WT, no significant difference was observed. The number of microbiome colonies around the root in the transgenic F and non-transgenic WT plants was a non-significant difference, which indicates that the transgenic line has no threatening effects on the environment and human pathogenicity. The relative expression of AtSOS3 and Catalase1 genes in line F had higher values than WT. The reason for such increase in the expression of Catalase1 is the activation of plant defense mechanisms against stress. Finally, the results of the evaluations proved the equality of line F and WT
Davood Kiani, Gholamreza Ghodrati, Sadollah Mansouri,
Volume 9, Issue 1 (9-2022)
Abstract
Sesame is an important crop plant for harsh environmental conditions because it is relatively resistance to drought stress. Evaluation of different genotypes in different climate condition plays a fundamental role in selection of the best genotypes before the commercial release of a variety and helping in identify plant traits that should be monitored during breeding experiments. In the present study, 10 promising lines obtained from the preliminary yield test were investigated to evaluate the yield compatibility along with 6 local cultivars in a randomized complete block design experiment with three replications in two cropping years (2018 and 2019) in Dashtestan climate condition in Bushehr province. During the growing season, phenology traits, grain yield components and grain yield were measured. Based on the results of ANOVA, statistically significant difference was observed between different genotypes for plant height, height of the first sub branch, height of the first capsule, number of sub branches, number of capsules per plant, length of capsule, length of capsule bearing zone, number of seeds in capsule and grain yield. Based on the mean comparison and biplot analysis the genotype 12 (Local Dashtestan), 2 (SES97-103), 7 (SES97-110) and 15 (Local Jiroft), were identified as superior genotypes for grain yield. Genotype 5 (SES97-105) and genotypes 14 (SES97-124) with 104.5 days and 4 (Local Darab1) with 111 showed the highest and lowest number of days to maturity, respectively. First capsule height showed the highest positive and significant phenotype (0.56) and genetic (0.78) correlation with grain yield. Days to the end of flowering and days to physiological maturity traits showed a negative genetic correlation with yield. Cluster analysis separated 16 sesame genotypes into four separate groups. Based on regression analysis, the height of the first capsule was identified as the most sensitive trait in predicting the yield of sesame genotypes in Dashtestan region in Bushehr province, which seems it can be considered during breeding programs.
Nasrin Razmi, Ebrahim Hezarjaribi, Abbasali Andarkhor,
Volume 9, Issue 2 (3-2023)
Abstract
Soybean is the promising oilseed in the face of protein and oil shortage. In this study 16 advanced soybean genotypes, in terms of seed yield and yield components were evaluated using multivariate statistical methods. This experiment was carried out in the form of randomized complete block design (RCBD) in the research farm of Ardabil Agricultural and Natural Resources Research Center (Moghan) for two consecutive years (2017-2018). Combined analysis of variance emphasized the statistically significant differences for seed yield, yield components and growth period among these soybean genotypes. Based on the mean comparison results, G1, G5 and G11 genotypes had the highest grain yield, longest growth period was observed in G1, G16 and G6 genotypes and highest number of seeds per m2 was belonged to G1, G16 and G9 genotypes. The broad sense heritability for plant height, seed yield and number seed in m2 were 0.92.07, 75.31 and 79.25 percentage, respectively. Also, the results showed that there was a positive and significant correlation between seed yield and leaf area of per plant, growth period, number of seeds per m2 and number of pods per plant. Genotypes were classified into four distinct groups in cluster analysis and the Ward method. The results of principal component analysis and biplot confirmed by the clustering results, too.G1, G2, G5 and G11 genotypes belong to the first group from cluster analysis with higher seed yield and number of seed per m2, and these genotypes are recommended in future breeding programs.
Jawed Rahimi, Fatemeh Amini, Hossein Ramshini, Mahyar Abedi, Mahmood Lotfi,
Volume 9, Issue 2 (3-2023)
Abstract
Tomato is the second most important vegetables, after potato, which has the highest area of cultivation worldwide. Acording to FAO statistics, Iran is the sixth producer of tomato cultivation in the world. However, more than 95 percent of vegetable seeds are imported into the country. The present study was conducted in order to evaluate commercial imported hybrids (8320, Eden, Matin and Xaman) and the F2 and F3 generations resulting from their self-breeding. In this regard, after the production of F2 and F3 generations, three generations (F1, F2 and F3) together with the control variety (Early Orbana y) were evaluated in the research farm of Seed and Plant Improvement Institute, Karaj, Iran, based on a randomized complete block design with four replications during 2019-2020. The analysis of variance showed that the difference among genotypes for single plant yield, days to flowering, average single fruit weight, number of fruits harvested and acidity (pH), was significant at the level of 1% probability and total soluble solids (TSS) was significant at the level of 5%. The results of the mean comparison showed that the highest mean of single plant yield belonged to 8320 F1 (10920/10g), the highest days to flowering was observed in Xaman F2 (47.01 days), the highest mean weight of single fruit was observed in Xaman F1 (115.50 g), the highest number of fruits harvested was in Xaman F1 (106.62), the highest amount of total soluble solids was in Matin F3 generation (4.96) and the lowest amount of acidity (pH) was in 8320 F1 (4.10). The results of estimating genetic parameters showed that most of the evaluated traits had high genetic and phenotypic variances, but a slight difference was observed between the coefficient of phototypic variation and the coefficient of genotypic variation, which indicates a small effect of environment on the control of these traits. Higher variance of dominance than additive variance in most traits caused the degree of dominance to be greater than one, Therefore, the possibility of control of traits by genes with dominance or over-dominance effects is high, and in order to improve these traits, the methods for hybrid development are suggested.
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