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Showing 2 results for Sadeghi
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.
Seyede Maryam Seyed Seyed Hassan Pour, Leila Nejadsadeghi, Zahra Sadat Shobbar, Danial Kahrizi,
Volume 10, Issue 2 (2-2024)
Abstract
Camelina )Camelina sativa (is an annual, self-pollinating, allohexaploid plant with diploid inheritance belonging to the Brassicaceae family. Camelina exhibits a remarkable degree of similarity to the model plant Arabidopsis thaliana. WRKY transcription factors are among important gene families in plants that play crucial roles in regulating growth and development and in response to diverse stresses. In this research, using bioinformatics analysis and databases, members of the WRKY gene family were identified and their various characteristics were investigated. Overall, the genome of the Camelina plant was found to harbor 214 members of the WRKY gene family. All 214 WRKY genes were found to possess the conserved WRKY functional domain, along with a variety of motifs within their structural composition. Phylogenetic analysis divided the identified members of Camelina WRKY genes into four main groups. Examination of the chromosomal positions revealed that the 214 identified WRKY genes exhibited an uneven distribution across the chromosomes. In order to validate the identified genes, the expression of two genes (Csa11g065620 and Csa07g035970) orthologs of two genes involved in drought stress in Arabidopsis (WRKY8 and WRKY57), were investigated in a drought tolerant (DH 91) and a drought sensitive (DH 101) lines. The results of the gene expression analysis showed that both genes had high expression in drought stress conditions in tolerant line in comparison to normal conditions, whereas no significant expression was found in drought sensitive line. The findings of the present study offer valuable insights for evolutionary investigations and enhance our understanding of the functional roles of the WRKY gene family in Camelina, thereby laying a foundation for future research endeavors in this field.
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