Effect of terminal heat stress on stability of yield and quality parameters in bread wheat in south-west Haryana

Abstract

A set of 42 bread wheat genotypes representing different agro climatic zones, were selected for the present study. The material was grown in four different test environment in randomized block design with three replications to identify the stable genotypes under different environments. The genotypes WH 711, DBW 17, PBW 343, UP 2338, WH 542, HD 2687, PBW 550, WH 416 and were promising for grain yield. A major portion of G×E was accounted by non-linear component for days to heading, days to maturity and biological yield per plant. However, the linear portion was higher for number of grains per spike, effective tillersper plant and protein (%). The genotypes WH 711, DBW 17, PBW 343, UP 2338, HD 2687, WH 416 and WH 283 were found stable for grain yield in all the environments, because they had above average mean, βi value equal to zero and non-significant S2di value. It means that these were less responsive to the environmental changes and therefore, more adaptive. . The genotypes WH 1052 and WH 1053 were found stable for favourable environment as these genotypes were having high mean performance with high response and least deviation from regression.