Tag Archives: gamma-aminobutyric acid

Stress metabolites in wheat: role in adaptation to drought

24.06.2025   Uncategorized   No comments

Yu. E. Kolupaev1,2*, L. I. Relina1, A. I. Oboznyi1, N. I. Ryabchun1,
N. I. Vasko1, V. P. Kolomatska1, O. Yu. Leonov1

1Yuriev Plant Production Institute, National Academy
of Agrarian Sciences of Ukraine, Kharkiv;
2Poltava State Agrarian University, Poltava, Ukraine;
*e-mail: plant_biology@ukr.net

Received: 25 April 2025; Revised: 21 May 2025;
Accepted: 11 June 2025; Available on-line: 07 July 2025

Drought is one of the main factors limiting agricultural production and leading to crop losses. Wheat, being a source of food for over half of the world’s population, is a plant species that is very susceptible to drought. In this regard, research into the species-specific stress metabolites and physiological and biochemical mechanisms of drought tolerance is of particular practical interest. This review comprehensively examines the roles of soluble carbohydrates, proline, polyamines, and GABA, as well as their functional interplay, in adaptation of wheat and other plant species to drought.

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Gamma-aminobutyric acid modulates antioxidant and osmoprotective systems in seedlings of Triticum aestivum cultivars differing in drought tolerance

02.11.2023   Uncategorized   No comments

Yu. E. Kolupaev1,2,3*, I. V. Shakhov1,3, A. I. Kokorev1,
L. Kryvoruchko2, T. O. Yastreb1,4

1Yuriev Plant Production Institute, National Academy of Agrarian Sciences of Ukraine, Kharkiv;
*e-mail: plant_biology@ukr.net;
2Poltava State Agrarian University, Poltava, Ukraine;
3State Biotechnological University, Kharkiv, Ukraine;
4Crop Research Institute, Prague, Czech Republic

Received: 28 August 2023; Revised: 30 September 2023;
Accepted: 27 October 2023; Available on-line: 06 November 2023

The stress-protective effects of plant neurotransmitters, including gamma-aminobutyric acid (GABA) have been intensively examined in recent years. However, studies on the GABA influence on stress protective systems in bread wheat cultivars with different drought adaptation strategies are still lacking. The aim of this work was to estimate the GABA effect on the state of antioxidant and osmoprotective systems in etiolated seedlings of two wheat cultivars differing significantly in drought tolerance, namely Doskonala (non-drought-resistant) and Tobak (drought-resistant) under model drought induced by PEG 6000. Two-day-old seedlings were transferred to 15% PEG 6000 and incubated for two days in the absence or presence of GABA. Treatment with 0.1 and 0.5 mM GABA significantly reduced the growth-inhibitory effect of PEG 6000 on the roots and shoots of both cultivars, but to a greater extent on those of non-resistant Doskonala. It was shown that GABA treatment reduced drought-induced accumulation of H2O2 and MDA, stabilized SOD and GPX activity, the level of sugars, anthocyanins and flavonoids in seedlings of both cultivars. Meanwhile GABA treatment enhanced the stress-induced increase in proline content in the Doskonala cultivar, but decreased it in the Tobak, completely prevented stress induced decrease in anthocyanins and flavonoids level in the Tobak and only partially in Doskonala cultivar. Thus, the stabilization of the stress-protective systems functioning in the wheat cultivars and variety-dependent differences in response to GABA were revealed.

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