Stability analysis for grain yield and physiological traits in synthetic derived RILs population under different moisture regimes in wheat

Drought stress is one of the major yield limiting factors in wheat among the abiotic stresses. In the present study, different physiological traits at different growth stages and grain yield were examined in the recombinant inbred lines population derived from Synthetic 46 genotype in six test environmental conditions. Grain yield per plot showed significant positive correlation with SPAD1 and SPAD2, but negative correlation with CT2, NDVI1, NDVI2, NDVI3 and NDVI4. Combined analysis of variance suggested genotypic effect as a predominant source of variation followed by GEI and environment effect. AMMI and GGE biplot analysis were used to analyze the effects of GEI on grain yield, and to compute the AMMI stability value and yield stability index which identified G127, G120, G105, G190 and G154 genotypes (RILs) that are highly adapted, stable and high yielding. Hence, the selected RILs according to yield stability index could be used as donors to develop stable high-yielding genotypes and the physiological traits can be best utilized to screen out the lines under different moisture stress regimes.