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Showing 7 results for Line
Shiva Gheitaran Poorsahrigh, Seyed Abolghasem Mohammadi, Behzad Sadeghzadeh,
Volume 1, Issue 1 (5-2014)
Abstract
Iron is one of the essential micronutrient, which has an important role in nitrogen fixation and activity of some enzymes such as catalase, peroxidase and cytochrome oxidase. To map QTLs related to accumulation of iron in shoot of barley at five leaves and maturity stages, 148 doubled haploid lines derived from a cross between Clipper and Sahara3771 varieties were evaluated under greenhouse condition and single plant iron concentration and content were measured. For QTL analysis by linkage map including, 26 retrotransposone markers IRAP and REMAP, 246 SSR and EST-SSR, 238 RFLP and one morphological markers was used. Analysis of variance revealed significant difference between lines for all the studies traits and presence of trangreesive segregation for all the traits and indicated presence of desirable parental allele combinations in the progenies. In total, 511 markers in 7 linkage covered 1099.09 cM of barley genome with an average distance of 2.37 cM between two adjacent markers. For single plant iron concentration, eight and four, iron content in single plant, six and three QTLs were identified at vegetative and maturity stages, respectively. Negative additive effects of the most QTLs indicate the role of Sahara3771 alleles in increased iron accumulation in offspring. One common genomics regions was detected for QTLs of single plant iron concentration and content at maturity which could be due to linkage between the QTLs or the pleiotropic effect of a single QTL.
Sedigh Ebrahimi, Abdolhossein Rezaei Nejad, Ahmad Ismaili, Farhad Karami,
Volume 1, Issue 2 (2-2015)
Abstract
Evaluation of genetic diversity among apricot genotypes may increase our genetic knowledge and provide better plant materials for selection of desirable genotypes. In this study, genetic diversity of 26 apricot genotypes phenological and physiological traits of 26 apricot cultivars collected at Kurdistan agricultural research station was studied based on a randomized complete block design with three replications for phenological and physiological traits. Analysis of variance showed that the effect of genotype on flower initiation, flowering period, relative water content (RWC), ion leakage, proline and potassium content of flower pistil tissue, spring frost damage to flowers, harvest date, total soluble solids, titratable Acidity (TA) and pH was significant at the 1% level. These results indicated that the existence of significant genetic variation among studied genotypes. The lowest heritability (28.5%) was belonged to date of 50% flowering, indicating the strong effect of environmental factors on this trait. The highest heritability (99%) estimated for related traits to yield including total soluble solids, fruit harvesting period and uniform rippening, suggested that the influence of environmental effects on these traits were very low.
Rasoul Banaei, Amin Baghizadeh, Saeid Khavari Khorasani,
Volume 3, Issue 1 (9-2016)
Abstract
In order to estimate the components of genetic variance and general and specific combining abilities of maize lines, an experiment was done using 8 S6 inbred lines as female parents and 2 male inbred lines as testers consisted of K1264/5-1 (early mature) and K3615/1 (late mature) using line by tester mating design based on randomized complete block design with three replications in two different conditions (Salt stress with Ec=5 dsm-1 and non-salt conditions) in research field of graduate university of advanced technology (Kerman, Iran) in 2014. Analysis of variance results showed significant differences among inbred lines for some of measured traits in both salt and non-salt conditions. Significant differences observed for line × tester mean-squares in non-salty condition for all measured traits except days to silking and physiological maturity. In salt stress condition, just for leaves number per plant and days to silking, line × tester effects were not significant. Additive variance for days to silking and physiological maturity in non-salt condition was more than dominant variance, therefore the additive to non-additive variance ratio was more than 1 and indicating emphasis on this matter too. Inbred line L6 had a significant positive GCA and the highest grain yield with 1455.785 and 789.107 kg/ha in non-salt and salt stress condition, respectively. The crosses (L4×T1=428.460 and L7×T1= 438,345) in non-salt condition and (L3×T1=438.345) in salt stress conditions had a positive significant specific combining ability. Finally, from all existed variation, the lines and line × tester effects were more important than tester effects that indicates transmission of diversity from lines to hybrids.
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.
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.
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.
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.
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