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首页> 外文期刊>Plant Physiology and Biochemistry >Is ABA involved in tolerance responses to salinity by affecting cytoplasm ion homeostasis in rice cell lines?
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Is ABA involved in tolerance responses to salinity by affecting cytoplasm ion homeostasis in rice cell lines?

机译：ABA是否通过影响水稻细胞系的细胞质离子稳态而参与对盐分的耐受性响应？

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The ability of plant cells to maintain cytoplasm ion homeostasis under saline stress is among the main mechanisms involved in salt tolerance. To cope with excess Na~+, cells extrude it from the cytoplasm, which requires expenditure of metabolic energy, provided by H~+ gradients generated by membrane-bound H~+-pumps. ABA is well-known to be involved in physiological processes elicited or enhanced by stresses causing cell dehydration. In this work we studied the possible implication of this plant hormone in the control of salt-induced cellular mechanisms conducting to Na~+ extrusion from the cytoplasm. We used rice (Oryza sativa L.) cell lines selected for their different tolerance to salinity to measure the response to ABA of H~+-pumps and Na~+/H~+-antiporters associated to the plasma membrane and the tonoplast. Our results show that ABA generally enhances H~+-pumping under salt stress but not under control conditions. This effect occurs to a higher extent across the tonoplast in the more tolerant lines (L-T). Na~+/H~+ antiport activity is practically undetectable in calli under control conditions, pre-treated or not with ABA, but shows a strong activation under salinity across the tonoplast, particularly in L-T lines (cv Bahia) and also across de plasma membrane in cv Bomba. In these lines, prior treatments with ABA tend to reduce the NaCl enhanced activity of both antiporters. Overall, under saline conditions ABA seems to affect synergistically H~+ pumping and antagonistically Na~+ extrusion. A complex network of positive and negative regulatory signals seems involved in restoring ion cell homeostasis under salt stress.
机译：植物细胞在盐胁迫下维持细胞质离子稳态的能力是涉及耐盐性的主要机制之一。为了应付过量的Na〜+，细胞从细胞质中挤出Na〜+，这需要消耗代谢能，这是由膜结合的H〜+泵产生的H〜+梯度提供的。众所周知，ABA参与由引起细胞脱水的应激引起或增强的生理过程。在这项工作中，我们研究了这种植物激素在控制盐诱导的细胞质从细胞质中向Na +挤出过程中的细胞机制的可能含义。我们使用因对盐度的不同耐受性而选择的水稻（Oryza sativa L.）细胞系来测量与质膜和液泡膜相关的H〜+泵和Na〜+ / H〜+反向转运体对ABA的响应。我们的结果表明，ABA在盐胁迫下通常会增强H〜+泵浦作用，而在对照条件下则不会。在更宽容的品系（L-T）中，液泡膜上的这种效应发生的程度更高。 Na〜+ / H〜+反向转运活性实际上在对照条件下的愈伤组织中是无法检测到的，无论是用ABA预处理还是未用ABA处理，但在盐度下，在液泡膜上，特别是在LT系（cv Bahia）以及整个血浆中，都显示出强活化简历中的膜。在这些品系中，先前用ABA进行的治疗往往会降低NaCl增强的两种反向转运蛋白的活性。总体而言，在盐条件下，ABA似乎协同影响H〜+的泵送和拮抗的Na〜+的挤出。正负调节信号的复杂网络似乎参与了盐胁迫下离子细胞稳态的恢复。

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