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首页> 外文期刊>Journal of Experimental Botany >Mycorrhizal and non-mycorrhizal Lactuca sativa plants exhibit contrasting responses to exogenous ABA during drought stress and recovery
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Mycorrhizal and non-mycorrhizal Lactuca sativa plants exhibit contrasting responses to exogenous ABA during drought stress and recovery

机译：菌根和非菌根紫花苜蓿植物在干旱胁迫和恢复过程中对外源ABA表现出不同的响应

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摘要

The arbuscular mycorrhizal (AM) symbiosis enhances plant tolerance to water deficit through the alteration of plant physiology and the expression of plant genes. These changes have been postulated to be caused (among others) by different contents of abscisic acid (ABA) between AM and non-AM plants. However, there are no studies dealing with the effects of exogenous ABA on the expression of stress-related genes and on the physiology of AM plants. The aim of the present study was to evaluate the influence of AM symbiosis and exogenous ABA application on plant development, physiology, and expression of several stress-related genes after both drought and a recovery period. Results show that the application of exogenous ABA had contrasting effects on AM and non-AM plants. Only AM plants fed with exogenous ABA maintained shoot biomass production unaltered by drought stress. The addition of exogenous ABA enhanced considerably the ABA content in shoots of non-AM plants, concomitantly with the expression of the stress marker genes Lsp5cs and Lslea and the gene Lsnced. By contrast, the addition of exogenous ABA decreased the content of ABA in shoots of AM plants and did not produce any further enhancement of the expression of these three genes. AM plants always exhibited higher values of root hydraulic conductivity and reduced transpiration rate under drought stress. From plants subjected to drought, only the AM plants recovered their root hydraulic conductivity completely after the 3 d recovery period. As a whole, the results indicate that AM plants regulate their ABA levels better and faster than non-AM plants, allowing a more adequate balance between leaf transpiration and root water movement during drought and recovery.
机译：丛枝菌根（AM）共生通过改变植物生理和植物基因的表达来增强植物对水分缺乏的耐受性。推测这些变化（除其他外）是由AM和非AM植物中脱落酸（ABA）含量的不同引起的。但是，目前还没有关于外源ABA对胁迫相关基因表达和AM植物生理的影响的研究。本研究的目的是评估干旱和恢复期后，AM共生和外源ABA的施用对植物发育，生理以及几种胁迫相关基因表达的影响。结果表明，外源ABA的施用对AM和非AM植物具有对比作用。只有用外源ABA饲喂的AM植物可以保持苗生物量的生产，而不受干旱胁迫的影响。外源ABA的添加显着提高了非AM植物芽中ABA的含量，并伴随着胁迫标记基因Lsp5cs和Lslea以及Lsnced基因的表达。相比之下，外源ABA的添加会降低AM植物芽中ABA的含量，并且不会进一步增强这三个基因的表达。 AM植物在干旱胁迫下总是表现出较高的根系水力传导率值和蒸腾速率降低。从遭受干旱的植物中，只有AM植物在3天恢复期后完全恢复了根系水力传导率。总体而言，结果表明AM植物比非AM植物更好，更快地调节其ABA水平，从而在干旱和恢复过程中在叶片蒸腾与根水运动之间实现了更充分的平衡。

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    《Journal of Experimental Botany》 |2008年第8期|p.2029-2041|共13页
  • 作者

    Ricardo Aroca1 Paolo Vernieri2 and Juan Manuel Ruiz-Lozano1*;

  • 作者单位

    1Departamento de Microbiología del Suelo y Sistemas Simbióticos. Estación Experimental del Zaidín (CSIC). Profesor Albareda no. 1, E-18008 Granada, Spain 2Dipartimento di Biologia delle Piante Agrarie, Università degli Studi di Pisa, I-56100 Pisa, Italy;

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