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Stress defense mechanisms of NADPH-dependent thioredoxin reductases (NTRs) in plants

机译:NADPH依赖的硫氧还蛋白还原酶(NTRs)在植物中的胁迫防御机制

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摘要

Plants establish highly and systemically organized stress defense mechanisms against unfavorable living conditions. To interpret these environmental stimuli, plants possess communication tools, referred as secondary messengers, such as Ca2C signatureand reactive oxygen species (ROS) wave. Maintenance of ROS is an important event for whole lifespan of plants, however, in special cases, toxic ROS molecules are largely accumulated under excess stresses and diverse enzymes played as ROS scavengers. Arabidopsis and rice contain 3 NADPH-dependent thioredoxin reductases (NTRs) which transfer reducing power to Thioredoxin/Peroxiredoxin (Trx/Prx) system for scavenging ROS. However, due to functional redundancy between cytosolic and mitochondrial NTRs (NTRAand NTRB, respectively), their functional involvements under stress conditions have not been well characterized. Recently, we reported that cytosolic NTRA confers the stress tolerance against oxidative and drought stresses via regulation of ROS amounts using NTRA-overexpressing plants. With these findings, mitochondrial NTRB needs to be further elucidated.
机译:植物建立了针对不利的生活条件的高度系统地组织的压力防御机制。为了解释这些环境刺激,植物拥有交流工具,称为次级信使,例如Ca2C签名和活性氧(ROS)波。维持ROS是植物整个生命的重要事件,但是,在特殊情况下,有毒的ROS分子在过量的胁迫下大量积累,各种酶作为ROS的清除剂。拟南芥和大米含有3种NADPH依赖性的硫氧还蛋白还原酶(NTR),可将还原力转移至硫氧还蛋白/过氧化物酶(Trx / Prx)系统,以清除ROS。但是,由于胞质和线粒体NTR(分别为NTRA和NTRB)之间的功能冗余,它们在应激条件下的功能参与尚未得到很好的表征。最近,我们报道了胞质NTRA通过使用过表达NTRA的植物调节ROS量来赋予抗氧化和干旱胁迫的胁迫耐受性。有了这些发现,需要进一步阐明线粒体NTRB。

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