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Exploring Salinity Tolerance Mechanisms in Diverse Egyptian Grape Genotypes Based on Morpho-Physiological, Biochemical, Anatomical and Gene Expression Analysis

Viticulture is one of the agricultural sectors with major economic importance in Mediterranean climate zones. Salinity is considered a substantial issue for agricultural sectors in arid and semi-arid regions, where it has the potential to impair production of grape (Vitis vinifera), which is categorize as a moderately sensitive species to salinity, and its impact is expected to increase with climate change. As exploiting genetic diversity is one of the most promising strategies to cope with the negative impacts of climate change on viticulture and adapt under the new conditions to maintain grape production and quality, the study aimed to explore salinity tolerance mechanisms in diverse Egyptian grape genotypes based on morpho-physiological, biochemical, anatomical and gene expression analysis. Nine local grape genotypes; Baltim Eswid, Edkawy, Matrouh Eswid, Bez El-Naka, Bez El-Anza, Romy Ahmer, Gharibi, Fayoumi and Romy Abiad, were evaluated for tolerance under saline conditions. Salinity stress was induced in three levels of 2.28, 3.75 and 5.20 ms (using NaCl at 1000, 2000 and 3000 ppm, respectively) comparing to 695 µs irrigation water as control. Results indicated that, the growth of all investigated local grape genotypes was adversely affected by salt treatments in a cultivar-dependent manner. Proposed salt-tolerance mechanisms including; controlling the growth rate, reducing damage resulting from oxidative stress associated with salinity, keep balanced hydric status, structural alterations allowing protection and regulation of ions uptake. It was observed that, Edkawy local grape cultivar is a promising salt-tolerant genotype. On the other hand, Romy Abiad and Gharibi genotypes were classified as the most salt-sensitive comparable with other tested local cultivars. Bez El-Anza genotype which maintained 100% survivability under severe salinity stress condition was characterized by a remarkable decline in vegetative growth accompanied with keeping more leaves with a marked reduction in leaf area and most measurements of certain anatomical features, slight Na uptake, but undisputed oxidative stress indicators and down-regulated expression folds of AREB2 transcription factor; a sugar accumulation regulatory related gene. Therefore, local genotypes of Egyptian table grapes can be considered a storehouse of germplasm that should be conserved and not threatened with extinction or complete loss because they are adapted to severe environmental conditions and harsh cultural managements.

Grape, Salinity, Genotypes, Oxidative Stress, Biochemical, Anatomical, Gene Expression

APA Style

Mahmoud, R., Dahab, A., Mahmoud, G., El-Wahab, M. A., Ismail, A., et al. (2023). Exploring Salinity Tolerance Mechanisms in Diverse Egyptian Grape Genotypes Based on Morpho-Physiological, Biochemical, Anatomical and Gene Expression Analysis. American Journal of BioScience, 11(6), 171-186.

ACS Style

Mahmoud, R.; Dahab, A.; Mahmoud, G.; El-Wahab, M. A.; Ismail, A., et al. Exploring Salinity Tolerance Mechanisms in Diverse Egyptian Grape Genotypes Based on Morpho-Physiological, Biochemical, Anatomical and Gene Expression Analysis. Am. J. BioScience 2023, 11(6), 171-186. doi: 10.11648/j.ajbio.20231106.16

AMA Style

Mahmoud R, Dahab A, Mahmoud G, El-Wahab MA, Ismail A, et al. Exploring Salinity Tolerance Mechanisms in Diverse Egyptian Grape Genotypes Based on Morpho-Physiological, Biochemical, Anatomical and Gene Expression Analysis. Am J BioScience. 2023;11(6):171-186. doi: 10.11648/j.ajbio.20231106.16

Copyright © 2023 Authors retain the copyright of this article.
This article is an open access article distributed under the Creative Commons Attribution License ( which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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