Surveying the relations among traits affecting seed yield in sesame ( Sesamum indicum L.)
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J. Crop Sci. Biotech. 2016 (December) 19 (4) : 303 ~ 309 DOI No. 10.1007/s12892-016-0053-0 RESEARCH ARTICLE
Surveying the Relations among Traits Affecting Seed Yield in Sesame (Sesamum indicum L.) Seyyed Hamid Reza Ramazani Department of Agronomy and Plant Breeding Sciences, University of Birjand, Birjand, Iran Received: June 21, 2016 / Revised: August 2, 2016 / Accepted: November 12, 2016 Ⓒ Korean Society of Crop Science and Springer 2016
Abstract To determine the most important traits influencing seed yield of sesame, 18 lines were evaluated in a randomized block design with three replicates in two years during the 2013 and 2014 growing seasons. Following a combined analysis of variance, multivariate statistical analyses such as simple correlation coefficients, factor analysis, stepwise analysis, path analysis, and cluster analysis were administered on combined means. The correlation coefficient analysis showed a significant negative correlation between seed yield and number of capsules per plant and number of seeds per capsule. Correlation between germination period and seed yield was positive and significant at 5% probability level. Factor analysis divided the 14 measured variables into five factors. In the stepwise regression analysis for seed yield as the independent variable, four traits including number of capsules per plant, first capsule height, number of seeds per capsule, and stem length to first capsule were entered into the regression model in four steps with r2=0.72. The regression coefficient of number of capsules per plant, number of seeds per capsule, and stem length to first capsule were negative and the regression coefficient of the first capsule height was positive and significant at the 5% probability level. The path coefficient analysis based on seed yield as a dependent variable implicated that the number of seeds per capsule had the highest negative direct effect on seed yield. The highest negative indirect effect on seed yield was related to the number of capsules per plant through the number of seeds per capsule. Cluster analysis using Ward’s method divided 18 investigated lines into five clusters. Key words : Cluster analysis, correlation, path analysis. sesame, stepwise regression
Introduction Sesame (Sesamum indicum L.) is an oilseed crop belonging to the Pedaliaceae family that is famous for the high quality oil from its seed (Haruna et al. 2012; Yol et al. 2010). Seed yield is an important objectives in all plant breeding programs as well as the study of the relationship between yield and its contributing characters, issues that plant breeders must know (Ashraf and Mohsen 2013). Yield is a quantitative and complicated trait that is controlled by many genes and mainly affected by environmental factors. So in first steps of plant breeding programs, it is better to use yield component traits in selection instead of seed yield due to the biological nature and regular interaction of yield components, usually a variety of positive and negative correlations that happens between yield and
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