Investigating stress indices to discriminate the physiologically efficient heat tolerant genotypes of mungbean [Vigna radiata (L.) Wilczek

Abstract

In present global climatic scenario, heat stress is one of the prime problems affecting production of mungbean crop during summer. A major objective of mungbean breeding programs to increase genetic potential of genotypes under heat stress environments. In order to identify heat tolerant promising lines, a total of 35 genotypes were evaluated in normal and heat stress environments during 2012–2013. Eight heat indices were used on the basis of grain yield in normal and heat stress environment. Highest significant positive correlations were observed among mean productivity, Geometric mean productivity, stress tolerant index and yield indices under both normal and heat stress environments. Based on 3-D plot, the genotypes i.e. SML 1186, NDM 12–308, IPM 02-4 and Smrat were found with high stress indices score and could be utilized in mungbean breeding programs to introduce and develop the heat tolerant promising varieties.