DUS characterization of some released varieties and advanced breeding lines of soybean (Glycine max L.) under Punjab agroclimatic conditions.

Abstract

Soybean is ranked as one of the major oil crops in the world. In India, the consumption of soybean oil, as well as other soy-based products, has been on the rise which has led to its occupying a cherished position in area and production amongst the different oilseed crops. Morphological characterization of genotypes helps create a database on the grounds of which these can be distinguished and the genetic diversity existing in them can be assessed. A total of 22 soybean lines were evaluated for DUS characterization, which comprised of 7 released varieties and 15 advanced breeding lines bred under Punjab agroclimatic conditions. Of the 19 characters observed only one character, viz, plant growth type, was monomorphic and showed no variation amongst any of the lines studied. All the entries exhibited semi-determinate growth type during both the years of observation. Nine characters were dimorphic while 9 characters showed polymorphic variation. The study revealed that flower color and hypocotyl pigmentation could be used as critical morphological characters for ascertaining varietal distinctiveness amongst genotypes. Of the 22 genotypes, few were utterly unique as they could be distinguished based on a single trait while the majority were very closely related. Cluster analysis revealed that the 22 genotypes could be grouped into four major clusters, whereby 13 genotypes were found to be unique based on at least one character and others could be distinguished based on a set of traits rather than a single trait.

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