The reaction of the photosynthetic apparatus of different resistance modern varieties of winter wheat to the effect of moderate drought

In vegetation experiments, a study of changes in the content of chlorophyll, chlorophyll fluorescence induction and the content of protective low molecular weight proteins in four different plasticity varieties of winter wheat under the conditions of a ten-day drought was carried out. It was established that the Natalka variety is the most sensitive to drought. On the first day of drought, this variety lost chlorophyll the fastest, and was distinguished by a more significant decrease in fluorescence induction parameters. In the varieties Podolyanka, Podilska Nyva and Paradnytsia, the loss of chlorophyll and the reduction of parameters of the induction curve on the first day of drought were smaller. It is shown that on the seventh day of moderate drought, the fluorescence induction indicators increase in Podolyanka, Poradnytsia and Podilska Nyva varieties. The formation of non-specific resistance due to the increased synthesis of protective proteins is noted for these varieties. The strong, high-protein variety Natalka only partially restored the indicators of fluorescence induction and was distinguished by a slight increase in the content of protective low molecular weight proteins.