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首页> 外文期刊>Protoplasma: An International Journal of Cell Biology >Salinity-induced subcellular accumulation of H _2O _2 in leaves of rice
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Salinity-induced subcellular accumulation of H _2O _2 in leaves of rice

机译：盐分诱导水稻叶片H _2O _2亚细胞积累

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摘要

The localization of salt-induced H _2O _2 accumulation in the leaves of rice was examined using 3,3-diaminobenzidine and CeCl _3 staining at ultrastructure level. When the 3-week-old rice plants were affected by 100 mM NaCl for 14 days, the swelling of thylakoids and the destruction of thylakoid membranes were observed. H _2O _2 accumulation was also observed in the chloroplast of the leaf treated with NaCl. The electron dense products of 3,3-diaminobenzidine and CeCl _3 were mainly observed especially around the swelling of thylakoids. H _2O _2 accumulation and any ultrastructural changes were not observed in the chloroplasts under dark condition. Furthermore, treatment with ascorbic acid suppressed both H _2O _2 accumulation and the changes in chloroplast ultrastructure. These results suggest that light-induced production of excess H _2O _2 under salinity is responsible for the changes in chloroplast ultrastructure. H _2O _2 accumulation was also observed in the mitochondria, peroxisomes, plasma membrane, and cell walls under light but not dark, suggesting that these organelles are also the source of H _2O _2 and the production is light dependent under salinity.
机译：使用3,3-二氨基联苯胺和CeCl _3染色以超微结构水平检查了盐诱导的水稻叶片中H _2O _2积累的定位。当三周大的水稻植株受到100 mM NaCl作用14天时，观察到类囊体肿胀和类囊体膜破坏。在NaCl处理的叶片的叶绿体中也观察到H _2O _2的积累。主要观察到3,3-二氨基联苯胺和CeCl _3的电子致密产物，尤其是在类囊体膨胀周围。在黑暗条件下，叶绿体中未观察到H _2O _2的积累和任何超微结构的变化。此外，抗坏血酸处理抑制了H _2O _2的积累和叶绿体超微结构的变化。这些结果表明在盐度下光诱导的过量H _2O _2的产生是叶绿体超微结构变化的原因。在光亮但不黑暗的条件下，线粒体，过氧化物酶体，质膜和细胞壁中也观察到了H _2O _2的积累，这表明这些细胞器也是H _2O _2的来源，其产量在盐度下是光依赖性的。

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