National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
An experiment on Indian mustard (Brassica juncea L. Czern and Coss), for divergence studies under rainfed condition, was conducted in Randomized Complete Block Design (RBCD) accommodating 50 genotypes, from various Rapeseed and Mustard centres located across country, randomly in three replications during Rabi 2015-16 at the research farm of Tirhut College of Agriculture, Dholi, Muzaffarpur. Analysis of variance revealed considerably exploitable variability for all the 25 traits. Euclidean and Tocher clustering methods, accommodated Rajendra Suphlam in oligo-genotypic cluster VIII as most divergent genotype. Rearranging fence – sitter genotypes into sub-clusters and rescaled main group through Euclidean method, Varuna and Pusa Bold grouped with Pusa Mahak and exhibited maximum intracluster distance. Utilizing maximum inter-cluster distance between cluster V and VIII followed by IV and VIII and II and VIII altogether 19 crosses suggested. Overall most promising crosses, based on per se and cluster mean values namely RH-0116/ Rajendra Suphlam, PM-25/ Rajendra Suphlam and Kanti/ Rajendra Suphlam were Late × Early (Days to first flower open, days to 50% flowering and days to physiological maturity), Non-basal branching × Basal branching, High × Low placed siliqua and Low × High (Harvest - index and Dry matter efficiency) parents along with superiority in several other yield components. Such crosses can provide useful heterotic combinations and could be utilized in trangressive breeding program. Root length followed by height of first primary branch and root volume contributed maximum (85.39%) towards total divergence. Geographically unique genotype Rajendra Suphlam proven its overall superiority exhibiting basal branching, deepest tap root with more volume, least height of first siliqua, high yield per plant along with appropriate harvest – index and dry matter efficiency, thus its usefulness in Rainfed agro-ecologies of Bihar.
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