GENETIC STUDIES ON YiELD & YIELD CONTRIBUTING CHARACTERS IN F2 DIALLEL POPULATION OF Brassica napus L

Abstract

An experiment on oleiferous Hra.s'sica napus L. was conducted at the experimental field to evaluate diallel analysis for ten different characters. Out of fifteen crosses, the parent Nap-9908 was the best general combiner for number of siliquae per plant, seed per siliqua and seed yield per plant. The parent Nap-205 was the best general combiner for plant height parent Nap-9901 was the best general combiner for days to maturity and Nap-lOS for number of primary branches per plant. The parent Nap-9905 was the best combiner for siliqua length and parent Nap-I 30 for thousand seed weightlhe higher magnitude of (JC'A variance was observed than that of SCA variance for plant height days to maturity, no. of primary branches per plant, number of siliquae per plant, siliqua length, seeds per siliqua, seed yield per plant and thousand seed weight. The SCA estimates of various characters revealed that Nap-9908 x Nap- 130 was the best combination for plant height Nap-9905 x Nap-205 for no. of primary branches per plant. Nap-9901 x Nap-205 for secondary branches, Nap-9908 x Nap-9901 for number of siliqua per plant. Nap-9901 x Nap-205 for siliqua length. Nap-9901 x Nap-205 for seeds per siliqua, Nap-9905 x Nap-205 for seed yield per plant and Nap-lOS x Nap-9908 for thousand seed weight were the best cross combinations. The Vr-Wr graph indicate over dominance for plant height, days to flowering, primary branches per plant siliquae per plant, seeds per siliqua, siliqua length and thousand seed weight. Partial dominance was observed for secondary branches per plant and seed yield per plant. The graphical analysis also indicates wide genetic diversity among the parents.