Acclimation to NaCl and H2O2 develops cross tolerance to saline-alkaline stress in Rice (Oryza sativa L.) by enhancing fe acquisition and ROS homeostasis
Acclimation to NaCl and H2O2 develops cross tolerance to saline-alkaline stress in Rice (Oryza sativa L.) by enhancing fe acquisition and ROS homeostasis
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DOI：
10.1080/00380768.2021.1952849
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发表时间：
2021-07
影响因子：
2
通讯作者：
R. Kamanga;Shohei Oguro;Mami Nampei;A. Ueda
中科院分区：
文献类型：
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作者：
R. Kamanga;Shohei Oguro;Mami Nampei;A. Ueda
摘要植物具有交叉耐受性，即植物在经历一种胁迫后又能耐受另一种胁迫。在这项研究中，我们研究了这一现象在水稻（Oryza sativa L.）来阐明潜在的生理机制二十一（21）日龄幼苗预暴露于各种浓度的NaCl，NaHCO3，和H2O2 7天，然后进行盐碱胁迫（SAS）14天。目前的研究结果报告说，预先暴露于10 mM NaCl和10 µM H2O2通过触发涉及Fe吸收和ROS稳态的全身生理过程来产生对SAS的交叉耐受性。虽然这种耐受性的机制在预处理之间有所不同，但一致认为以下过程的相关性：（1）维持较低生长培养基pH的能力，（2）抑制根K+损失的能力，（3）维持稳定的Fe和P获取和（4）通过增强抗氧化酶活性调节活性氧（ROS）的产生。两者合计，这些结果是一致的假设，即盐胁迫，氧化胁迫和SAS之间存在串扰，引发适应性生理反应，发展耐SAS水稻，一种现象，提供了一个前景发展耐多种胁迫的植物。
ABSTRACT Plants are known to develop cross-tolerance in which plants tolerate to one stress following prior exposure to another stress. In this study, we investigated this phenomenon in rice (Oryza sativa L.) to elucidate the underlying physiological mechanisms. Twenty-one (21) day-old seedlings were pre-exposed to various concentrations of NaCl, NaHCO3, and H2O2 for 7 days and then subjected to saline-alkaline stress (SAS) for 14 days. The present findings report that pre-exposure to 10 mM NaCl and 10 µM H2O2 develops cross-tolerance to SAS by triggering systemic physiological processes involved in Fe uptake and ROS homeostasis. While the mechanisms of this tolerance vary among pre-treatments, a consensus suggests the relevance of the following processes: (1) the ability to maintain a lower growth medium pH, (2) ability to suppress root K+ losses, (3) maintenance of a stable acquisition of Fe and P and (4) regulated generation of reactive oxygen species (ROS) via enhanced antioxidant enzyme activities. Taken together, these results are consistent with the hypothesis that a crosstalk exists between salinity stress, oxidative stress, and SAS, triggering adaptive physiological responses that develop tolerance to SAS in rice, a phenomenon that offers a prospect for developing plants tolerant to multiple stressors.