Tag Archives: proline
Gamma-aminobutyric acid modulates antioxidant and osmoprotective systems in seedlings of Triticum aestivum cultivars differing in drought tolerance
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.
The effect of CO donor hemin on the antioxidant and osmoprotective systems state in Arabidopsis of a wild-type and mutants defective in jasmonate signaling under salt stress
M. A. Shkliarevskyi1, Yu. E. Kolupaev1,2*, T. O. Yastreb1,
Yu. V. Karpets1, A. P. Dmitriev3
1Dokuchaev Kharkiv National Agrarian University, Ukraine;
2Karazin Kharkiv National University, Ukraine;
3Institute of Cell Biology and Genetic Engineering, National Academy of Sciences of Ukraine, Kyiv;
*e-mail: plant.biology.knau@gmail.com
Received: 6 December 2020; Accepted: 17 May 2021
The role of the gasotransmitter carbon monoxide (CO) in signaling and adaptive processes in plants has been studied insufficiently. There are indirect data indicating jasmonate signaling participation in realization of CO effects, but the possible connection between carbon monoxide and jasmonate signaling during plant adaptation to salt stress remains unclear. We studied the carbon monoxide donor hemin effect on the Arabidopsis of a wild-type (Col-0) and defective in jasmonate signaling coi1 and jin1 mutants response to the salt stress. Arabidopsis thaliana 4-week-old plants were grown on a modified Hoagland’s medium. Plants were incubated for 24 h in usual or 2 µM hemin containing culture medium, then transferred to 150 mM NaCl containing media and incubated for 24 h before the medium was replaced with the usual one. It was shown that salt stress caused water deficiency and superoxide dismutase and catalase activity decrease in the plants of all three genotypes. Treatment with 2 μM hemin stabilized the levels of catalase activity and photosynthetic pigments and increased guaiacol peroxidase activity in a wild-type, but not in coi1 and jin1 mutant plants after stress induction. Treated with hemin wild-type Arabidopsis plants accumulated more proline and sugars in response to stress than treated coi1 and jin1 mutants. It was concluded that jasmonate signaling can be involved in adaptive processes induced by exogenous carbon monoxide.