Abstract
The lack of precipitation is a key stressor under the global climate change conditions around the world now. The aim of this work was analysis of the photosynthetic parameters’ changes under the influence of drought in flag leaf of alloplasmic wheat lines which obtained as a result of interspecific crosses. The content of chlorophyll a and b was determined in ethanol extracts from the flag-leaf blades of alloplasmic wheat lines and its parental forms whose were grown under field conditions. The photosynthetic activity of the flag-leaf blades was studied using a PAM fluorometer. It was shown that the chlorophyll content during drought had negatively correlated with flag-leaf water content and the magnitude of such indicators of photosynthesis intensity as Fv / Fm, Y (II) and Y (NPQ) limits by precisely the water potential decrease. The correlation dependences between photosynthetic parameters were revealed under the drought and productivity indicators. Based on the experiments, the most drought tolerant alloline D-41-05 was identified.