بررسي تنوع ژنتيكي و شاخص هاي انتخاب در لاين هاي اصلاحي حاصل از توده هاي بومي كنجد

چكيده انگليسي :

Investigation of Genetic Variation and Selection Indices in Breeding Lines Isolated from Local Population of Sesame Mina Salehi Salehi Mina@yahoo com Date of Submission 8 9 2010 Department of Agronomy and Plant Breeding Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc language Farsi Supervisors s name and Email address Ghodratollah Saeidi gsaeidi@cc iut ac ir Abstract In order to investigate genetic variation and selection indices for seed yield improvement in sesame fifteen breeding lines along with five local populations of this crop were evaluated in a randomized complete block design with three replications at the research farm of Isfahan University of Technology in 2009 In this study the traits of days to emergence days to flowering and maturity plant height branches plant capsule length capsules plant seed weight seeds capsules seed yield plant seed yield plot seed oil content and oil yield plot were evaluated The results of analysis of variance showed that there were significant differences among the genotypes for all of the studied traits Seed yield plant and seed yield plot of the genotypes varried from 13 02 to 35 g and 1297 to 3239 kg ha respectively A high broad sence heritability and low difference between genetic and phenotypic coefficients of variation was found for all of the studied traits except for days to emergence The genetic and phenotypic correlation coefficients showed that the traits of capsule length capsule plant seed weight and seeds capsule highly and positively correlated with seed yield The result of stepwise regression showed that capsules plant seeds capsule and seed weight were important components of seed yield plant and explained 99 percent of its variation Capsules plant seed weight and seeds capsule were also more important component of seed yeild plot and explained 74 percent of its variation Based on the results of path analysis capsules plant and seed weight had more direct effect on seed yield plant and seed yield plot respectively Cluster analysis classified the genotypes into two distinct groupes The highest estimated selection efficiency for genetically improvement of seed yield plant and seed yield plot was obtained via selection for seed yield plant and capsules plant respectively Therefore capsules plant can be used as an appropriate selection criterion for improvement of seed yield plant and seed yield plot The Smith Hazel 1 Smith Hazel 2 and Pesek Baker indices were constructed based on seed yield components of capsules plant seeds capsule and seed weight The results showed that seed yield was highly correlated with each of these indices and the estimated efficiency of indirect selection via these indices was relatively high Thus it seems that these selection indices can be effectively used for seed yield improvement The estimated selection efficiency for seed yield plot improvement via selection for Pesek Baker index was more than that of Smith Hazel ones However it seems that efficiency of the Smith Hazel indices for simultaneous improvement of capsules plant seeds capsule and seed weight is higher than that of Pesek Baker index Key word Sesame Agronomic traits Genetic variation Selection indices

صالحي، مينا

بررسي تنوع ژنتيكي و شاخص هاي انتخاب در لاين هاي اصلاحي حاصل از توده هاي بومي كنجد

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