Studies on Selection Parameters For Yield Improvement in Indian Mustard [brassica Juncea (L.) Czern. & Coss.]

Abstract

The present i~ves~igation entitled, "Studies on Selection Parameters for Yield Improvement in Ind1an ~ustard [Bras.slCGJ~m~e~ (L.) ~ze~: & Coss .. ]" involving twenty five genotypes was undertaken to exa~nme the geneyc v.anab1hty, hentab1hty, genetic advance, correlation coefficient, path coefficient analysis. and genetic. d1ve~gence. ~II . the .twenty five Indian mustard genotypes were grown in randomized ~lock design With 3 replications m 5 rows plot of 5 meter length, with row to row and plant to plant spacmg of 45cm and !Scm, respectively during rabi 20 13-14. Observations were recorded on various characters viz; days to 50% flowering, days to maturity, number of primary branches per plant, number of secondary branches per plant, plant height, length of main raceme, number of siliquae on main raceme, number of seeds per siliqua, siliquae length, seed yield per plant, test weight, and oil content. Analysis of variance revealed substantial amount of variability among the genotypes for all the characters, under study, indicated wide spectrum of variability among the genotypes. High genotypic and phenotypic coefficient of variation was observed for plant height, seed yield per plant and test weight and moderate was observed for number of secondary branches per plant, number of siliquae on main raceme and siliquae length, While, low GCV and PCV was observed for days to 50% flowering, days to maturity, number of primary branches per plant, length of main raceme, number of seeds per siliquae and oil content: High heritability coupled with high genetic advance were observed for number of secondary branches per plant, length of main raceme, number of siliquae on main raceme, seed yield per plant and test weight. Improvement in seed yield can be made by selecting these yield contributed traits having high heritability coupled with high genetic advance. Seed yield per plant exhibited significant and positive association with test weight, oil content, number of secondary branches per plant, plant height and length of main raceme at both genotypic and phen'otypic level. This might be due to linkage of genes determining these characters. Thus, it can be inferred that selection based on any one of these characters either alone or in combination, will help to identifying high yielding genotypes. Genotypic correlation was of higher magnitude as compare to the~r correspondi~g phenotypic correlati~n in most of the character combination, thereby, suggesting strong mherent association between genotypic and phenotypic level. Path coefficient analysis showed. that number of secondar~ branches per plant, plant height, length of main raceme, test weight and Oil c?ntent were the t~ost tmportant characters, controlling directly to seed yield. Whereas, days to matunty, numb~r of pnmary branches .P.er plant, number of secondary branches per plant, plant height, length .of ~at~ raceme, number ~f st~tqua~ ~n main raceme and test weight characters may improve seed yield mdtrectly. Mahala~obts D statistic revealed considerable genetic diversity among the genotypes. The genotypes group~d mt~ four clusters. The 1 and III cluster having the maximum number of genotypes C? each): ~hts envtsage that the genotypes grouped within a particular cluster are more or less .ge~etically stmtlar to each other and ·d apparent WI e d"t versi• ty ·IS mam· Jy due to tJ1e remaining genotype dtstnbuted over rest ofthe other cluster). In the present study, the maximum inter cluster distance was revealed between cluster~ and II (4.145 . The least inter cluster distance was revealed betwee~ .cluster II and .m (2.774). Dtvergence study ·n enoty es like Rohmt Maya, Krantl, RLM-619, RRN-505, CS-54, suggested that crosses suggest! g g P . h A' r d Mathura Rai for getting desired Pusa Basant, RGN-73, LET-18, RGN-48, Va1b av, rawa 1 an segregants from breeding point of view.