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Acclimation to NaCl and H2O2 develops cross tolerance to saline-alkaline stress in Rice (Oryza sativa L.) by enhancing fe acquisition and ROS homeostasis
Soil Science and Plant Nutrition ( IF 2 ) Pub Date : 2021-07-19 , DOI: 10.1080/00380768.2021.1952849
Rowland Maganizo Kamanga 1 , Shohei Oguro 2 , Mami Nampei 1 , Akihiro Ueda 1
Affiliation  

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.



中文翻译:

对 NaCl 和 H2O2 的驯化通过增强 fe 获取和 ROS 稳态在水稻(Oryza sativa L.)中产生对盐碱胁迫的交叉耐受

摘要

已知植物会产生交叉耐受性,其中植物在预先暴露于另一种胁迫之后耐受一种胁迫。在这项研究中,我们调查了水稻 ( Oryza sativa L.) 中的这种现象,以阐明潜在的生理机制。二十一 (21) 天大的幼苗预先暴露于不同浓度的 NaCl、NaHCO 3和 H 2 O 2 7 天,然后经受盐碱胁迫 (SAS) 14 天。本研究结果表明,预先暴露于 10 mM NaCl 和 10 µM H 2 O 2通过触发参与 Fe 摄取和 ROS 稳态的全身生理过程,对 SAS 产生交叉耐受性。虽然这种耐受性的机制因预处理而异,但共识表明以下过程的相关性:(1) 维持较低生长培养基 pH 值的能力,(2) 抑制根 K +损失的能力,(3) 维持稳定获取 Fe 和 P 和 (4) 通过增强的抗氧化酶活性调节活性氧 (ROS) 的产生。总之,这些结果与盐胁迫、氧化胁迫和 SAS 之间存在串扰的假设一致,触发适应性生理反应,使水稻对 SAS 产生耐受性,这种现象为开发耐受多种压力的植物提供了前景。

更新日期:2021-07-19
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