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In an effort to find breeding methods for improving drought stress tolerance   and grain yield, twelve photosynthetic efficiency parameters have been   measured on ten cultivars of winter wheat (Triticum aestivum L.), along with   water use (WU), water use efficiency (WUE) and agronomic traits of grain   yield (GYP), biomass weight (BWP), harvest index (HI), yield stability index   (YSI) and stress tolerance index (STI) in the vegetative pot trial with   control (B1) and drought stress (B2) treatments. Drought stress induced in   three different stages of development has caused decrease in water use   efficiency based on biomass (WUEb) (B1: 2.94 g L-1; B2: 2.71 g L-1) and grain   yield (WUEg) (B1: 1.03 g L-1; B2: 0.89 g L-1), as well as GYP and BWP.   Dissipation energy flux per excited cross section (DI0/CS0) observed in the   drought stress treatment in the tillering stage of growth gave significant   negative correlation coefficient (P?0.05) with agronomic traits of tested   wheat cultivars (GYP:-0.75; WUEg and STI: -0.74; YSI: -0.67). Performance   index (PIABS) measured in the drought stress conditions in the flag leaf   stage was in significant positive correlation with GYP and WUEg (r=0.64).   Lower values of absorption flux per excited cross section (ABS/CS0), electron   transport per excited CS (ET0/CS0) and dissipation energy flux per excited CS   (DI0/CS0) and higher values of PIABS, measured on wheat genotypes (cultivars)   in the drought stress conditions of pot trial, could indicate higher   tolerance to drought stress conditions. Results of the studied photosynthetic   efficiency parameters of wheat cultivars were also the good predictor for   important agronomic traits, especially, when they were detected in the early   stage of growth.

Photosynthetic efficiency parameters as indicators of agronomic traits of winter wheat cultivars in different soil water conditions