THE EFFECT OF WATER AND TEMPERATURE STRESS ON THE WINTER WHEAT WATER POTENTIAL
E. I. Nekrasov | E. V. Ionova
Due to the global climate changes, increase of its continentality and sharp fluctuations of meteorological factors it is necessary to improve heat resistance of developed varieties. Drought tolerant plants can adapt to dry conditions during ontogenesis and grow, develop and give yields under such conditions. The proper selection of the varieties, being highly resistant to drought in any soil-climatic areas will help to obtain stable yields in the region. The researchers suggest a complex of informative indexes, which allow assessing a degree of drought resistance of the varieties. It concerns a state of leaves, especially in the periods of filling and ripening of grains, capacity of leaves to water retention (6), longer size of coleoptile, ratio of above-ground mass to the amount of consumed water and many other indexes. In our work we studied the indexes of water regime of plants, such as general water content, water deficit, water retention and water absorbing capacities, which determine the condition of plants during the vegetation and allow estimate their response to the stress factors in the various periods of ontogenesis. The assessment of the characteristics of water regime was carried out on the provocative background ‘zasushnik’ with the artificial drought (30% TMC and less), with the optimal moisture supply (70% TMC, irrigation) and with the natural moisture (50% TMC, field). According to all characteristics of leaf water regime we identified the samples of winter soft wheat ‘Admiral’, ‘Izyuminka’, ‘Lidiya’, ‘Kapitan’ and ‘Lilit’, which belong to the steppe ecotype and possess high resistance and adaptability to the complex drought.
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