HIETEROSIS, INTERGENOTYPIC VARIABILITY, CORItELATION AND PATH ANALYSIS OF QUANTITATIVE CHARACTERS OF OLEIFEROUS Brassica campestris L.

Abstract

An experiment on olciferous Thu.vsica cwnpe.?1s L. was conducted to evaluate the heterosis. intergenotypic variability, character associations and direct and indirect etThct ol' different characters on seed yield. Desirable heterosis %\as shown by difkrvnt hybrids iii different characters. On the basis of desirable heterotic values the hhrids were scored lbr individual characters. On the basis of average score and ran[ position the hybrid SS 75 x Tori 7 was superior for number of primary branches per plant. number of siliquac per plant and seed yield per plant: BARlsar-ó x BAltlsar-WSS 75 x BARlsar-9 for seeds per siliqua: SALJ YC x furl 7 for number of secondary branches per plant: flARlsar-6 x flARlsar.9 for length of siliqua. SS 75 x Tori ltl3Altlsar-6 x l3ARlsar-9 tbr thousand seed weight and BARlsar-9 x SAU YC were superior for percent (u/o) oil content. [lie hybrid Tori 7 x SS 75 showed desirable negative heterosis for the characters days to first flowering. 50% flowering and maturity. Mean squares for all the characters were highl> significant and var;atIOns among the genotypes were wide. In general. environmental inFluences were minintal on yield and its component characters indicatiig that the> ere less responsive t) environmental factors for their phenotypic expression. The values cii phenol> pie coefficient of variation and genotypic coefficient of variation indicated that there were considerable variations for all the traits except days to niaturit> and length of siliqua. Heritability, genetic advance and genetic advance in percent of mean were high for almost all the characters indicating superior performance at' the genotypes ere due to geneticul reasons. [he genotypic correlatio n coefficients were higher than the corresponding phenotypic correlation coefheients. with the indication of a strong inherent association between the characters studied. Yield per plant had highest signiticant positive correlation \S ith IlLinther of siliquae per plant followed by number of secondary branches per plani. seeds per siliqua. thousand seed weight. length ofsiliqua. number of primary branches per plant. plant height and days to lirst flowering and nonsigiti leant positive correlation v. ithi days to mattirity in both geuotypic and phenotypie level. Path coefficient analysis revealed that iltotisand seed weight had the highest positive direct effect on seed yield per plant followed by seeds per siliqua. ntiniber ofsiliqtiae per plant. number of secondary branches per plant and plant height.