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首页> 外文期刊>Frontiers in Plant Science >Enhanced Drought Stress Tolerance by the Arbuscular Mycorrhizal Symbiosis in a Drought-Sensitive Maize Cultivar Is Related to a Broader and Differential Regulation of Host Plant Aquaporins than in a Drought-Tolerant Cultivar
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Enhanced Drought Stress Tolerance by the Arbuscular Mycorrhizal Symbiosis in a Drought-Sensitive Maize Cultivar Is Related to a Broader and Differential Regulation of Host Plant Aquaporins than in a Drought-Tolerant Cultivar

机译：干旱敏感玉米品种中丛枝菌根共生对干旱胁迫的耐受性增强，与寄主植物水通道蛋白的调控相比，宽泛和差异的调控要比抗旱品种的调控更为广泛。

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The arbuscular mycorrhizal (AM) symbiosis has been shown to improve maize tolerance to different drought stress scenarios by regulating a wide range of host plants aquaporins. The objective of this study was to highlight the differences in aquaporin regulation by comparing the effects of the AM symbiosis on root aquaporin gene expression and plant physiology in two maize cultivars with contrasting drought sensitivity. This information would help to identify key aquaporin genes involved in the enhanced drought tolerance by the AM symbiosis. Results showed that when plants were subjected to drought stress the AM symbiosis induced a higher improvement of physiological parameters in drought-sensitive plants than in drought-tolerant plants. These include efficiency of photosystem II, membrane stability, accumulation of soluble sugars and plant biomass production. Thus, drought-sensitive plants obtained higher physiological benefit from the AM symbiosis. In addition, the genes ZmPIP1;1, ZmPIP1;3, ZmPIP1;4, ZmPIP1;6, ZmPIP2;2, ZmPIP2;4, ZmTIP1;1, and ZmTIP2;3 were down-regulated by the AM symbiosis in the drought-sensitive cultivar and only ZmTIP4;1 was up-regulated. In contrast, in the drought-tolerant cultivar only three of the studied aquaporin genes ( ZmPIP1;6, ZmPIP2;2 , and ZmTIP4;1 ) were regulated by the AM symbiosis, resulting induced. Results in the drought-sensitive cultivar are in line with the hypothesis that down-regulation of aquaporins under water deprivation could be a way to minimize water loss, and the AM symbiosis could be helping the plant in this regulation. Indeed, during drought stress episodes, water conservation is critical for plant survival and productivity, and is achieved by an efficient uptake and stringently regulated water loss, in which aquaporins participate. Moreover, the broader and contrasting regulation of these aquaporins by the AM symbiosis in the drought-sensitive than the drought-tolerant cultivar suggests a role of these aquaporins in water homeostasis or in the transport of other solutes of physiological importance in both cultivars under drought stress conditions, which may be important for the AM-induced tolerance to drought stress.
机译：丛枝菌根（AM）共生已显示可通过调节多种寄主植物水通道蛋白来提高玉米对不同干旱胁迫情况的耐受性。这项研究的目的是通过比较AM共生对两个玉米品种根系水通道蛋白基因表达和植物生理的影响，并对比干旱敏感性来突出水通道蛋白调控的差异。该信息将有助于鉴定与AM共生增强的干旱耐受性有关的关键水通道蛋白基因。结果表明，当植物遭受干旱胁迫时，AM共生在干旱敏感植物中比耐旱植物诱导更高的生理参数改善。这些包括光系统II的效率，膜的稳定性，可溶性糖的积累和植物生物量的生产。因此，干旱敏感植物从AM共生中获得了更高的生理益处。此外，在干旱敏感的AM共生作用下，基因ZmPIP1; 1，ZmPIP1; 3，ZmPIP1; 4，ZmPIP1; 6，ZmPIP2; 2，ZmPIP2; 4，ZmTIP1; 1和ZmTIP2; 3被下调。品种，只有ZmTIP4; 1上调。相反，在耐旱品种中，只有三个研究的水通道蛋白基因（ZmPIP1; 6，ZmPIP2; 2和ZmTIP4; 1）受AM共生调控，从而被诱导。对干旱敏感的品种的结果与以下假设相吻合：在缺水条件下水通道蛋白的下调可能是减少水分流失的一种方式，而AM共生可以帮助植物进行这种调节。确实，在干旱胁迫期间，节水对于植物的存活和生产力至关重要，这是通过水通道蛋白参与的有效吸收和严格控制的水分流失来实现的。此外，在干旱敏感品种比耐旱品种中，AM共生对这些水通道蛋白的调节作用范围更广，形成对比，这表明这些水通道蛋白在水分稳态下或在干旱胁迫下对两个品种中具有重要生理意义的其他溶质的转运都起着作用。条件，这可能对AM诱导的干旱胁迫耐受性很重要。

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