Physiological responses of olive cultivars to salinity stress

Rahemi, Majid; Karimi, Sara; Sedaghat, Sahar; Rostami, Ahmad Ali

doi:10.13128/ahs-20726

Cited by 5 publications

(1 citation statement)

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“…In this regard, Hosseini et al (2013) disclosed that the phosphorus, nitrogen, and potassium content in leaves was substantially influenced by water stress. Moreover, according to the present experiment, drought-stressed olive cultivars accumulated proline in their leaves which is a major osmoprotectant that accumulates in plants under water scarcity (Rahemi et al, 2017). The amino acid proline is mainly responsible for osmotic adjustment by creating and maintaining osmotic pressure (Liu et al, 2011;Ali et al, 2021).…”

Section: Gene Expression Analysismentioning

confidence: 56%

Biochemical, physiological, and molecular responses of diverse olive cultivars to different irrigation regimes

ALOWAIESH,

EL-MANSY,

EL-ALAKMY

et al. 2023

Not Bot Horti Agrobo

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Olive is an essential industrial crop in the Mediterranean region with valuable economic and agricultural concerns. Despite its drought resistance, its productivity is restricted by extreme drought stress. Olive cultivars display considerable variation in response mechanisms to drought stress. Accordingly, the impact of mild and extreme water deprivation over two seasons compared to full irrigation requirements on growth and physiological characteristics of three diverse olive cultivars. Three olive cultivars, ‘Manzanillo’, ‘Eggizi-Shami’, and ‘Tofaahi’, were evaluated under three irrigation regimes 100% ETc, 75% ETc, and 50% ETc. Characteristics of shoot and root, as well as physio-chemical constituents, were determined. Besides, the gene expression of dehydration-responsive element binding (DREB), dehydrin (DHN), and catalase (CAT) genes in olive cultivars were explored under different irrigation regimes. The results indicated a substantial impact of irrigation level on all studied parameters. The mild and extreme drought stress treatments caused a gradual reduction in nitrogen, phosphorus, and potassium content, relative water content, root and shoot length, root and leaf numbers, branch count, and leaf area across both seasons. Conversely, proline content was considerably increased under drought treatments compared to well-watered conditions. Similarly, the assessed cultivars exhibited significant variation in all studied parameters, with ‘Eggizi-Shami’ demonstrating superiority. Under mild and extreme drought stress conditions, the cultivar ‘Eggizi-Shami’ displayed the highest proline content and most growth characteristics. Besides, the real-time quantitative PCR (RT-qPCR) analysis displayed significant alterations in gene expression of the tested three genes related to drought response (DHN, DREB, and CAT). The RT-qPCR analysis revealed that under drought stress conditions (75% and 50% ETc), ‘Eggizi-Shami’ exhibited higher expression compared to the other two cultivars (‘Tofaahi’ and ‘Manzanillo’). Combining the results of morphological and physiological parameters with gene expression analysis of drought-related genes can offer highly validated information about drought-tolerant olive cultivars. This integrated approach serves as an innovative methodology to identify and confirm genes involved in abiotic stress.

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Section: Gene Expression Analysismentioning

confidence: 56%