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Gamma-aminobutyric acid (GABA) and salinity impacts antioxidative response and expression of stress-related genes in strawberry cv. Aromas

  • Biochemistry & Physiology - Original Article
  • Published:
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Abstract

Salinity is one of the most crucial abiotic stresses which is the consequence of increase in the concentration of NaCl ions influencing plant’s growth, development, and yield. Gamma-aminobutyric acid (GABA) is a non-protein amino acid involved in various metabolic processes that accumulates in many plant species during stress conditions. The present study was aimed to evaluate the effect of GABA (0 and 25 mM) and salinity (3 and 5 dS m−1) on physiological characteristics and expression pattern of some salinity-related genes in strawberry cv. Aromas under soilless culture condition at 12, 24, and 36 h after treatments’ initiation. Based on the results, salinity increased the content of H2O2, MDA, and proline, while it decreased the percentage of MSI and the activity of SOD and POD antioxidant enzymes. In contrast, the implementation of GABA not only decreased H2O2 and MDA content and maintained MSI percentage, but it also improved the activity of antioxidant enzymes and the transcription level of DREB, cAPX, MnSOD, and GST genes. Under non-stress conditions, GABA acted as a mild stressor by imposing effects similar to abiotic stress which could help plants adapt under the adverse environmental conditions. We concluded that strawberry plants had a better response to salinity by enhancing both enzymatic and non-enzymatic antioxidant physiological protection mechanisms and also by increasing the transcription of salinity-related genes upon GABA application.

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Abbreviations

GST:

Glutathione S-transferases

MDA:

Malondialdehyde

MSI:

Membrane stability index

SOD:

Superoxide dismutase

ROS:

Reactive oxygen species

SOD:

Superoxide dismutase

cAPX:

Cytosolic ascorbate peroxidase

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Acknowledgements

The authors acknowledge the Vice-Chancellor of Academic Affairs, University of Kurdistan, for financial support.

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Authors and Affiliations

  1. Department of Horticultural Science, Faculty of Agriculture, University of Kurdistan, 66177-15175, Sanandaj, Iran

    Sahar Golnari, Yavar Vafaee, Farzad Nazari & Naser Ghaderi

  2. Research Center for Strawberry Breeding and Improvement, University of Kurdistan, 66177-15175, Sanandaj, Iran

    Yavar Vafaee & Naser Ghaderi

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  1. Sahar Golnari
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  2. Yavar Vafaee
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All authors contributed to the study conception and design. YV and FN participated in the experiment design and coordination and guaranteed of integrity of the entire study. SG carried out the experiment. YV and NG performed the statistical analysis. YV, FN, and NG were involved in drafting the manuscript, evaluating the statistical analysis, and critical revising the manuscript. All authors read and approved the final manuscript.

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Correspondence to Yavar Vafaee.

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Golnari, S., Vafaee, Y., Nazari, F. et al. Gamma-aminobutyric acid (GABA) and salinity impacts antioxidative response and expression of stress-related genes in strawberry cv. Aromas. Braz. J. Bot 44, 639–651 (2021). https://doi.org/10.1007/s40415-021-00750-8

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