Visn. Hark. nac. agrar. univ., Ser. Biol., 2020, Issue 2 (50), p. 83-92


I. V. Kosakivska, L. V. Voytenko, M. M. Shcherbatiuk, V. A. Vasjuk

Kholodny Institute of Botany
of National Academy of Sciences of Ukraine
(Kyiv, Ukraine)


We analyzed the effect of simulated heat stress (+ 40°C, 2 h) on endogenous abscisic (ABA) and indole-3-acetic (IAA) acids accumulation and distribution in 14-day-old wheat Triticum spelta L. cultivar Frankenkorn and on the 21st day after recovery. In the control conditions, ABA and IAA were found to dominate in the shoots. During growth on the 21st day, the content of IAA in the roots doubled, while ABA accumulated mainly in the shoots. After hyperthermia, the content of endogenous ABA in the shoots and roots increased 1,8 and 1.4 times, respectively, and amounted to 42,5 and 22,8 ng/g of fresh weight, while the content of IAA decreased 2,3 and 1,3 times and amounted to 24,8 and 6,4 ng/g of fresh weight. During the recovery period on the 21st day, level of endogenous ABA in shoots increased by 39,3%, in the roots – by 8,3%. Concentration of the hormone in the shoots in the post-stress period did not reach the control values, but in the roots – exceeded 20.1%. A decrease in the content of endogenous IAA by 25,4% during the recovery period was observed in the shoots, while in the roots, on the contrary, the hormone content increased by 60,9%, but was lower than control. Thus, after the short-term hyperthermia the pattern of ABA and IAA accumulation and distribution in Triticum spelta, like in the related species Triticum aestivum L. cultivar Podolyanka, had different directions: ABA content increased and that of IAA decreased, especially in the shoots, and the lowest IAAs were found in the roots. The functional interaction of ABA and IAA under heat stress and after recovery is discussed. The obtained results revealed similarities and differences in the response of two wheat species` phytohormonal system to a short-term hyperthermia and confirmed that changes in the balance and localization of ABA and IAA are involved in the formation of adaptive strategy.

Key words: Triticum spelta, abscisic acid, indol-3-acetic acid, heat stress, recovery



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