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Information × Registration Number 0223U000626, 0121U100747 , R & D reports Title Regulatory systems of the photosynthetic apparatus and their role in the realization of genetic potential of plant yield under variable climatic conditions popup.stage_title Head Stasyk Oleh O., Доктор біологічних наук Registration Date 16-01-2023 Organization Institute of Plant Physiology and Genetics of the National Academy of Sciences of Ukraine popup.description2  It was established that drought-resistant winter wheat varieties of have a better ability to regulate the stomatal aperture and photosynthetic CO2 and H2O gas exchange under conditions of soil drought. Closure of flag leaf stomata under moisture deficiency was greater in drought-resistant cultivars than in less resistant cultivars, but photosynthesis intensity was less inhibited and water use efficiency was higher. The differences between varieties in the structural and functional characteristics of the stomata were more pronounced for the abaxial side of the leaf than for the adaxial side. The traits of the stomatal apparatus of the abaxial side of the leaf were more closely correlated with indicators of drought resistance of plants. In plants exposed to drought, the number of stomata per unit of abaxial leaf surface was negatively correlated with the intensity of photosynthesis (r = -0.748), the mass of grain from the main ear (r = -0.748), and the area of the stomatal pore with the intensity of photosynthesis (r = - 0.854) and water use efficiency (r = -0.796). It is shown that under a heat stress, the less drought-resistant variety Natalka undergoes more significant structural rearrangements of chloroplast grains and the loss of their physiological activity than the varieties Podolyanka, Podilska Niva, and Poradnytsia. Under a drought, the Natalka variety loses a greater amount of chlorophyll, especially in the lower leaves, and is distinguished by the lowest accumulation of a protective protein of 21.5 kDa. In the varieties Podolyanka, Podilska Niva and Poradnytsia, along with increased synthesis of this protein, there is a partial compensation of chlorophyll loss due to increased activity of the light phase of photosynthesis in the flag leaf after resuming watering. Product Description popup.authors Bondarenko Oksana Y Zhuk Olga I. Kiriziy Dmytro A. Mikhno Alla I. Makharynska Nadiia Mykhaylivna Оsipova Oksana L Petrushevska Valentyna N. Polishchuk Hanna I. Sitnik Sergiy Kostyantinovich Sokolovska-Serhiienko Oksana H. Tarasyuk Maksim Vitaliyvich Trosenko Vita Anatoliivna Tumenok Ludmyla V. Shevshenko Viktor V. popup.nrat_date 2023-01-16 Close