Multivariate analysis of yield and its components in sunflower genotypes (Helianthus annuus L.) under favorable irrigation and moisture stress conditions
Subject Areas :
Ali Saremi-Rad
1
,
Khodadad Mostafsvi
2
1 - Plant breeding Ph. D. student, Department of Agronomy and Plant Breeding, Young Researchers and Elite Club, Karaj Branch, Islamic Azad University, Karaj, Iran.
2 - Associated Professor, Department of Agronomy and Plant Breeding, Karaj Branch, Islamic Azad University, Karaj, Iran.
Keywords: factor analysis, Regression, Sunflower,
Abstract :
Considering the important role of sunflower in human life, in order to investigate the relationship between grain yield and other traits, 12 genotypes were cultivated in two conditions under favorable irrigation conditions and moisture stress in a randomized complete block design with three replications in 2015. Plant height and 100 seed weight in optimum irrigation condition and stem diameter, grain diameter, plant height, leaf length and leaf width were significantly and positively correlation with grain yield at 1 and 5% levels. The results of stepwise regression analysis in non-stress conditions showed that only two grain width and grain length traits were enteredinto the regression model and explained 80% of grain yield changes. However, under stress conditions, two traits of plant height and grain diameter were enteredinto the regression model and 91% of the changes explained. In factor analysis, four independent factors under normal conditions and three independent factors under stress conditions were 69.62% and 74.16% of total data changes. Considering the results obtained in terms of moisture stress, plant height and grain diameter, and under non stress conditions, traits related to seed characteristics (grain width, grain length and 100 seed weight) were the best traits for evaluating sunflower genotypes.
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