Morphophysiological parameters of hard and soft wheat genotypes depending on different water supply

To determine drought tolerance of 10 wheat varieties (3 durum and 7 bread) differing in architectonics, the research was performed under normal and drought conditions. The reduction in the plant height due to cultivation conditions rather than genetic properties of the genotypes occurred because of the decreasing length of upper internodes by 0.47-9.51%. Structural components of the product were determined. The greatest reduction in above-ground dry biomass per unit of the field was detected in Barakatli 95 and Garagylchyg 2 genotypes. The amounts of pigments were determined to evaluate the level of the photosynthetic apparatus development, its physiological state, formation and accumulation potential of the product. The content of chlorophyll a, b and carotenoids was determined during the grain forming, milk ripening, and wax ripening phases. Green plastids were broken down and chlorophyll content decreased under drought. Chlorophyll a content decreased more sharply compared with chlorophyll b. Chlorophyll a content decreased more sharply in all phases in the durum variety Barakatli 95 (during the phases, respectively, 19.7; 16.6 and 35.6%) and bread variety Gyrmyzy gul 1 (21.9; 15.3; 39.5%). Chlorophyll b amount decreased less in the durum variety Tartar (11.0; 7.30; 14.2%) and bread variety 4th FEFWSN-50 (4.83; 10.8; 9.20%). Amounts of the photosynthetic pigments were determined in various regions (Gobustan and Jalilabad Regional Experimental Stations). Chlorophyll a content decreased more in the Gyrmyzy gul 1 and Garagylchyg 2 varieties (in Gobustan: 2.302 and 2.979 mg/g fresh weight) in Jalilabad: 2.096 and 2.737 mg/g fresh weight) under rainfed conditions. Drought had a relatively less impact on chlorophyll a content in the Azamatli 95 and Gobustan varieties. Chlorophyll b content ranged from 0.033 to 2.398 mg/g fresh weight in Gobustan and from 0.057 to 2.175 mg/g fresh weight in Jalilabad, whereas the content of did not decrease.