Search academic texts

Information × Registration Number 0225U000412, (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 Дослідити участь регуляторних систем фотосинтетичного апарату в адаптації до посухи і високої температури в сортів озимої пшениці. Head Stasyk Oleh O., Доктор біологічних наук Registration Date 11-01-2025 Organization Institute of Plant Physiology and Genetics of the National Academy of Sciences of Ukraine popup.description1 Research of peculiarities of functioning of regulatory systems of photosynthetic apparatus, ensuring preservation of its activity and maximum realization of genetic potential of grain productivity under optimal conditions and influence of stress factors in modern high-yielding varieties and lines of winter wheat and identification of indicators that can serve as physiological used to develop highly effective molecular genetic markers in the breeding of winter wheat. popup.description2  Genotypic differences in drought and heat tolerance of the leaf photosynthetic apparatus of winter wheat varieties were revealed. Drought significantly affects both the activity of photosynthesis under stationary conditions and the dynamics of photosynthesis induction during the transition from darkness to light, in particular, it slows down the growth of the intensity of gas exchange. It was found that the processes of CO2 assimilation - the Rubisco carboxylase reaction and the Calvin cycle are much more sensitive to the effects of drought than the stomatal conductivity and the processes of light energy conversion and electron transport in chloroplasts. The decrease in the use of energy in the processes of CO2 assimilation under the drought affected the activity of photosystem II, however, the intensity of linear electron transport was maintained due to the activation of alternative energy sinks, in particular photorespiration and pseudo-cyclic electron transport. Plants of the Sofia Kyivska variety demonstrated high drought resistance of the photosynthetic apparatus, rapid response to changes in the light both under stress and normal conditions as well as good recovery ability. Plants of the Chygyrynka variety, which showed the worst performance under drought conditions, showed the best recovery ability after the stressor was removed. The high-protein variety Natalka was most sensitive to drought and high temperature. One of the reasons for its relatively lower resistance may be the lower synthesis of molecular chaperones of the 20-22 kDa family. The heating temperature of 55 °C was lethal for all studied varieties. Under drought conditions, the Podolyanka, Podilska Nyva and Poradnytsia varieties increase the synthesis of protective structural proteins, which contribute to the preservation of photosystem II in an intact state, which allows maintaining its high functional activity. Product Description popup.authors Bondarenko Oksana Yu. Holoboroda Alina S. Zhuk Olha I. Zborivska Oksana V. Kirizii Dmitro A. Mikhno Alla I. Makharynska Nadiia M. Moskalenko Alla V. Osypova Oksana L. Petrushevska Valentyna N. Sytnyk Serhii K. Sokolovska-Serhiienko Oksana H. Tarasiuk Maksym V. Trotsenko Vita A. Shevshenko Viktor V. popup.nrat_date 2025-01-11 Close