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首页> 外文期刊>Journal of Plant Physiology >Salicylic acid improves acclimation to salt stress by stimulating abscisic aldehyde oxidase activity and abscisic acid accumulation, and increases Na+ content in leaves without toxicity symptoms in Solanum lycopersicum L.
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Salicylic acid improves acclimation to salt stress by stimulating abscisic aldehyde oxidase activity and abscisic acid accumulation, and increases Na+ content in leaves without toxicity symptoms in Solanum lycopersicum L.

机译:水杨酸通过刺激脱落醛氧化酶活性和脱落酸积累来改善对盐胁迫的适应性,并增加无茄茄中无毒性症状的叶片中的Na +含量。

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摘要

Pre-treatment with 10(-4) M salicylic acid (SA) in hydroponic culture medium provided protection against salinity stress in tomato plants (Solanum lycopersicum L. cv. Rio Fuego). The effect of 10(-7) or 10(-4) M SA on the water status of plants was examined in relation to the biosynthesis and accumulation of abscisic acid (ABA) in order to reveal the role of SA in the subsequent response to salt stress. Both pre-treatments inhibited the K+ (Rb-86(+)) uptake of plants, reduced the K+ content of leaves, and caused a decrease in leaf water potential (psi(W)). Due to the changes in the cellular water status, SA triggered the accumulation of ABA. Since the decrease in psi(W), proved to be transient, the effect of SA on ABA synthesis may also develop via other mechanisms. In spite of osmotic adaptation, the application of 10(-4) M, but not 10(-7) M SA, led to prolonged ABA accumulation and to enhanced activity of aldehyde oxidase (AO1, EC.1.2.3.1.), an enzyme responsible for the conversion of ABA-aldehyde to ABA, both in root and leaf tissues. AO2-AO4 isoforms from the root extracts also exhibited increased activities. The fact that the activities of AO are significantly enhanced both in the leaves and roots of plants exposed to 10(-4) M SA, may indicate a positive feedback regulation of ABA synthesis by ABA in this system.
机译:在水培培养基中用10(-4)M水杨酸(SA)进行预处理可保护番茄植物(Solanum lycopersicum L. cv。Rio Fuego)免受盐分胁迫。考察了脱落酸(ABA)的生物合成和积累方面的关系,研究了10(-7)或10(-4)M SA对植物水分状况的影响,以揭示SA在随后对水的响应中的作用。盐胁迫。两种预处理均抑制植物对K +(Rb-86(+))的吸收,降低叶片的K +含量,并导致叶片水势(psi(W))降低。由于细胞水状态的变化,SA触发了ABA的积累。由于psi(W)的降低被证明是短暂的,因此SA对ABA合成的影响也可能通过其他机制产生。尽管有渗透适应性,但使用10(-4)M而不是10(-7)M SA可以延长ABA的积累并提高醛氧化酶的活性(AO1,EC.1.2.3.1。)。在根和叶组织中负责将ABA-醛转化为ABA的酶。来自根提取物的AO2-AO4同工型也表现出增加的活性。在暴露于10(-4)M SA的植物的叶子和根中,AO的活性均得到显着增强,这一事实可能表明该系统中ABA合成ABA的正反馈调节。

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