Ecology, Environment and Conservation Paper

Vol. 22, April Suppl. Issue 2016; Page No.(471-476)

TRAIT SELECTION CRITERIA AND TRANSGRESSIVE SEGREGANTS IN SELECTED CROSSES OF DOLICHOS BEAN [LABLAB PURPUREUS(L.) VAR. LIGNOSUS]

B. M. Showkath Babu, S. Ramesh and C. M. Keerthi

Abstract

Most of the economically important traits in crop plants (with no exception of dolichos bean) are governed by large number of genes with significant genotype × environment interaction. Hence, direct selection of such traits in segregating generations is less effective. Indirect selection for such traits based on easily observable/assayable/scorable traits is likely to more effective. An empirical study was conducted at the Department of Genetics and Plant Breeding, University of Agricultural Sciences, Bengaluru during 2014- 2015 to identify of surrogate traits strongly associated with difficult-to-select traits. The study indicatedsignificant and positive correlation of easily observable traits such as plant height, primary branches plant-1, racemes plant-1, fresh pods raceme-1 and fresh pods plant-1with fresh pod weight suggesting their utility as surrogates for selecting the genotypes for higher fresh pod weight plant-1. Of these traits, it is advisable to preferentially use racemes plant-1 as a surrogate as its association with fresh pod weight is more stronger than any other traits. However, selected plants need to be empirically evaluated for fresh pod weight plant-1 for assessing the effectiveness of selection based on racemes plant-1.

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