Physiological and biochemical responses of okra (Abelmoschus esculentus) under salinity stress in Iran

IF 4.8 Q1 AGRICULTURE, MULTIDISCIPLINARY Journal of Agriculture and Food Research Pub Date : 2024-07-25 DOI:10.1016/j.jafr.2024.101322
Raheleh Najafi , Ayatollah Rezaei , Maryam Mozafarian
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Abstract

Saline soil and water present significant agricultural challenges, particularly in arid and semi-arid regions like Iran. Around 15 % of Iran's land is categorized as saline. Salt stress disrupts various physiological processes in plants, leading to reduced crop yields. Considering the demand for food and the limitation of cultivated areas is rising, the cultivation of salt-resistant crops is gaining attention. This study was conducted to examine the morpho-physiological responses tolerance of a native cultivar of okra (Abelmoschus esculentus L. cv. White Ahvazi) under conditions of salinity stress. Understanding how this native cultivar responds to salinity stress is crucial for increasing its productivity. The okra seedlings were subjected to seven different levels of electrical conductivity (EC) (1.7 as control, 4.4, 6.2, 8.5, 10.6, 12.5, 14.4, and 15.8 mS/cm) after the appearance of their first true leaves by dissolving NaCl salt in Hoagland's nutrient solution. The results showed that morphological traits in the treated samples were not significantly different from the non-treated samples until EC reached a value of 10.6 mS/cm. The increases in EC from 1.7 to 10.6 mS/cm resulted in a significant rise in the antioxidant capacity and content of biochemical constituents. While salinity stress from EC 12.5 mS/cm onwards caused significant induction of hydrogen peroxide free radicals and peroxidation of membrane lipids. The yield was also significantly reduced at ECs of 12.5, 14.4, and 15.8 mS/cm, which were 31.1, 40.6, and 59.6 % less than control plants, respectively. Increasing salinity stress resulted in a remarkable reduction of photosynthetic pigments in plants as compared to the non-treated plants. Generally, it can be concluded that the White Ahvazi cultivar of okra commonly cultivated in Iran had a moderate tolerance to EC with a threshold of 10.6 mS/cm. Thus, this study can contribute towards enhancing food production in regions facing challenges related to salinity.

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伊朗黄秋葵(Abelmoschus esculentus)在盐胁迫下的生理和生化反应
盐碱地和盐碱水给农业带来了巨大挑战,尤其是在伊朗这样的干旱和半干旱地区。伊朗约有 15% 的土地属于盐碱地。盐胁迫会破坏植物的各种生理过程,导致作物减产。考虑到对粮食的需求和耕地面积的限制正在增加,抗盐作物的种植正受到越来越多的关注。本研究旨在考察秋葵本地栽培品种(Abelmoschus esculentus L. cv. White Ahvazi)在盐胁迫条件下的形态生理反应耐受性。了解这种本地栽培品种如何应对盐度胁迫对提高其产量至关重要。在黄秋葵幼苗长出第一片真叶后,通过在霍格兰营养液中溶解氯化钠(NaCl),对其施加了七种不同的电导率(EC)水平(对照为 1.7、4.4、6.2、8.5、10.6、12.5、14.4 和 15.8 mS/cm)。结果表明,在 EC 值达到 10.6 mS/cm 之前,处理过的样品的形态特征与未处理过的样品没有显著差异。EC 值从 1.7 mS/cm 增加到 10.6 mS/cm 时,抗氧化能力和生化成分含量显著增加。而从 EC 12.5 mS/cm 开始的盐度胁迫会显著诱发过氧化氢自由基和膜脂过氧化。在 EC 值为 12.5、14.4 和 15.8 mS/cm 时,产量也明显下降,分别比对照植株少 31.1%、40.6% 和 59.6%。与未受盐度胁迫的植物相比,盐度胁迫的增加导致植物光合色素显著减少。总之,可以得出结论,伊朗常见的白阿瓦兹秋葵栽培品种对氨基甲酸乙酯的耐受性一般,阈值为 10.6 mS/cm。因此,这项研究有助于提高面临盐度挑战地区的粮食产量。
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来源期刊
CiteScore
5.40
自引率
2.60%
发文量
193
审稿时长
69 days
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