Published in Scientific Papers. Series A. Agronomy, Vol. LXIV, Issue 1
Written by Mykola NAZARENKO, Oleksandr IZHBOLDIN, Olena SEMENCHENKO
Drought tolerance is one of the key agricultural value traits for arid regions. Our investigation consists of two stages. During fist we worked with well-known by this drought tolerance winter wheat official realized 16 varieties, at the second one we evaluated new 88 mutant lines at М4 – М6 generations, which are potentially higher yielding as compared with the national Ukrainian standard for arid zone (Northern Steppe). It is well known that photosystem-ІІ (PS- ІІ) is less thermal-resistant than photosystem-І (PS-І). Since PS-ІІ is more energy consuming and directly requires water for it active operation, this leads to a conclusion that during drought its activity predominance in the photosynthesizing system is undesirable. We evaluated potential drought tolerance by comparison photosystems activity. The simazine (Sim) 10-4(М) was used as PS-ІІ inhibitor, represses the oxygen release processes in the photosystem. More drought-resistant winter wheat lines showed the predominance of PS-І over PS-ІІ. It was established that the best lines in terms of drought resistance were the wheat lines 133, 157, 157-1, 185, 213, that is the lines with the lowest ratio between PS-ІІ and PS-І were identified as being more drought-resistant.
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