Ethylene triggers salt tolerance in maize genotypes by modulating polyamine catabolism enzymes associated with H2O2 production
Ethylene triggers salt tolerance in maize genotypes by modulating polyamine catabolism enzymes associated with H2O2 production
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DOI：
10.1016/j.envexpbot.2017.10.022
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发表时间：
2018-01-01
影响因子：
5.7
通讯作者：
Gomes-Filho, Eneas
中科院分区：
文献类型：
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作者：
Freitas, Valdineia Soares;Miranda, Rafael de Souza;Gomes-Filho, Eneas
本研究旨在调查耐盐和盐敏感玉米基因型的盐度驯化过程中乙烯和多胺代谢之间是否存在关系。仅在盐敏感植物暴露于 NaCl 期间才记录到双相乙烯产生（5.5 和 12.5 小时）。在耐盐基因型中，5.5 h 处的独特乙烯峰与多胺积累增加（多胺依赖性 H2O2 信号过程）密切相关，而在盐敏感基因型中则没有发生同样的情况。盐敏感基因型中 5.5 小时 H2O2 信号的缺失与 12.5 小时乙烯产生的爆发（称为“应激乙烯”）以及随之而来的盐度引起的总多胺含量下降有关。耐盐基因型中胁迫乙烯合成的缺乏归因于 1-氨基环丙烷-1-羧酸氧化酶 (ACO) 活性和 ZmACO5b 基因表达的下调。我们的研究结果表明，乙烯通过 H2O2 激活多胺分解代谢依赖性的复杂信号传导途径，与盐胁迫驯化密切相关。
The current study was undertaken to investigate if there is a relationship between metabolisms of ethylene and polyamines in the processes of salinity acclimation of salt-tolerant and salt-sensitive maize genotypes. Biphasic ethylene production (at 5.5 and 12.5 h) was registered only in salt-sensitive plants during NaCl exposure. In the salt-tolerant genotype, the unique ethylene peak at 5.5 h was closely related to increased polyamine accumulation (a polyamine-dependent H2O2 signalling process), whereas the same did not occur in the salt-sensitive genotype. The absence of H2O2 signalling at 5.5 h in the salt-sensitive genotype was related to a burst in ethylene production at 12.5 h, known as 'stress ethylene', as well as a concomitant decrease in total polyamine content by salinity. The lack of stress ethylene synthesis in the salt-tolerant genotype was attributed to down-regulation of 1-aminocyclopropane-1-carboxylic acid oxidase (ACO) activity and ZmACO5b gene expression. Our findings suggest that ethylene is intimately involved in salt stress acclimation through activation of a complex pathway of signalling by H2O2 that is polyamine catabolism-dependent.