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Alleviation of drought stress in faba bean (Vicia faba L.) by exogenous application of β-aminobutyric acid (BABA).
Physiology and Molecular Biology of Plants ( IF 3.5 ) Pub Date : 2020-04-28 , DOI: 10.1007/s12298-020-00796-0
Ghassen Abid 1 , Rim Nefissi Ouertani 2 , Salwa Harzalli Jebara 1 , Hatem Boubakri 1 , Yordan Muhovski 3 , Emna Ghouili 1 , Souhir Abdelkarim 1 , Oumaima Chaieb 1 , Yassine Hidri 4 , Safwen Kadri 5 , Mohamed El Ayed 5 , Salem Elkahoui 5, 6 , Fethi Barhoumi 1 , Moez Jebara 1
Affiliation  

Drought stress is one of the most prevalent environmental factors limiting faba bean (Vicia faba L.) crop productivity. β-aminobutyric acid (BABA) is a non-protein amino acid that may be involved in the regulation of plant adaptation to drought stress. The effect of exogenous BABA application on physiological, biochemical and molecular responses of faba bean plants grown under 18% PEG-induced drought stress were investigated. The results showed that the application of 1 mM of BABA improved the drought tolerance of faba bean. The application of BABA increased the leaf relative water content, leaf photosynthesis rate (A), transpiration rate (E), and stomatal conductance (gs), thereby decreased the water use efficiency. Furthermore, exogenous application of BABA decreased production of hydrogen peroxide (H2O2), malondialdehyde and electrolyte leakage levels, leading to less cell membrane damage due to oxidative stress. Regarding osmoprotectants, BABA application enhanced the accumulation of proline, and soluble sugars, which could improve the osmotic adjustment ability of faba bean under drought challenge. Interestingly, mended antioxidant enzyme activities like catalase, guaiacol peroxidase, ascorbate peroxidase and superoxide dismutase and their transcript levels may lead to counteract the damaging effects of oxidative stress and reducing the accumulation of harmful substances in BABA-treated faba bean plants. In addition, exogenous BABA significantly induced the accumulation of drought tolerance-related genes like VfMYB, VfDHN, VfLEA, VfERF, VfNCED, VfWRKY, VfHSP and VfNAC in leaves and roots, suggesting that BABA might act as a signal molecule to regulate the expression of drought tolerance-related genes.

中文翻译:

通过外源应用β-氨基丁酸(BABA)减轻蚕豆(Vicia faba L.)的干旱胁迫。

干旱胁迫是限制蚕豆(Vicia faba L.)作物生产力的最普遍环境因素之一。β-氨基丁酸(BABA)是一种非蛋白质氨基酸,可能参与植物对干旱胁迫的适应性调节。研究了外源BABA施用对18%PEG诱导的干旱胁迫下蚕豆植物生理,生化和分子反应的影响。结果表明,施用1 mM的BABA可以提高蚕豆的抗旱性。BABA的施用增加了叶片的相对含水量,叶片的光合作用速率(A),蒸腾速率(E)和气孔导度(gs),从而降低了水分利用效率。此外,外源施用BABA会降低过氧化氢(H2 O 2),丙二醛和电解质的泄漏水平,从而减少了由于氧化应激引起的细胞膜损伤。关于渗透保护剂,BABA的施用增加了脯氨酸和可溶性糖的积累,可以提高干旱胁迫下蚕豆的渗透调节能力。有趣的是,改良的抗氧化酶活性(如过氧化氢酶,愈创木酚过氧化物酶,抗坏血酸过氧化物酶和超氧化物歧化酶及其转录水平)可以抵消BABA处理的蚕豆植物中氧化胁迫的破坏作用并减少有害物质的积累。此外,外源BABA显着诱导了干旱耐受相关基因如VfMYBVfDHN叶和根中的VfLEAVfERFVfNCEDVfWRKYVfHSPVfNAC,表明BABA可能是调节干旱耐受性相关基因表达的信号分子。
更新日期:2020-04-28
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