Lack of mitochondrial thioredoxin o1 is compensated by antioxidant components under salinity in Arabidopsis thaliana plants
Lack of mitochondrial thioredoxin o1 is compensated by antioxidant components under salinity in Arabidopsis thaliana plants
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DOI：
10.1111/ppl.12708
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发表时间：
2018-11-01
影响因子：
6.4
通讯作者：
Sevilla, Francisca
中科院分区：
文献类型：
--
作者：
Calderon, Aingeru;Sanchez-Guerrero, Antonio;Sevilla, Francisca
在不断变化的环境中，植物能够通过参与应激反应的抗氧化剂和氧化还原系统调节新陈代谢来适应新的条件。在这里，我们研究了野生型 (WT) 拟南芥中的线粒体硫氧还蛋白以及在不存在或存在 100 mM NaCl 的情况下生长的两个 Attrxo1 突变株系。与野生型植物相比，对照条件下的突变体植物没有观察到明显的表型，尽管它们比野生型植物具有更高的气孔数量、水分损失、一氧化氮和羰基蛋白含量以及更高的超氧化物歧化酶（SOD）和过氧化氢酶活性。在盐度下，与野生型植物相比，突变体表现出较低的失水量和较高的气孔闭合、H2O2 和脂质过氧化水平，同时具有较高的过氧化氢酶和不同的 SOD 同工酶活性。这些诱导可能有助于维持在盐水条件下观察到的植物完整性和生长，可能作为补偿 TRXo1 缺乏的一种方式。我们讨论了TRXo1在盐分条件下影响整个植物发育的潜力，这对于在不利环境下生长的植物具有重要的农学价值。
In a changing environment, plants are able to acclimate to new conditions by regulating their metabolism through the antioxidant and redox systems involved in the stress response. Here, we studied a mitochondrial thioredoxin in wild-type (WT) Arabidopis thaliana and two Attrxo1 mutant lines grown in the absence or presence of 100mM NaCl. Compared to WT plants, no evident phenotype was observed in the mutant plants under control condition, although they had higher number of stomata, loss of water, nitric oxide and carbonyl protein contents as well as higher activity of superoxide dismutase (SOD) and catalase enzymes than WT plants. Under salinity, the mutants presented lower water loss and higher stomatal closure, H2O2 and lipid peroxidation levels accompanied by higher enzymatic activity of catalase and the different SOD isoenzymes compared to WT plants. These inductions may collaborate in the maintenance of plant integrity and growth observed under saline conditions, possibly as a way to compensate the lack of TRXo1. We discuss the potential of TRXo1 to influence the development of the whole plant under saline conditions, which have great value for the agronomy of plants growing under unfavorable environment.