Fundamental parenchyma cells are involved in Na+ and Cl- removal ability in rice leaf sheath
Fundamental parenchyma cells are involved in Na+ and Cl- removal ability in rice leaf sheath
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DOI：
10.1071/fp18318
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发表时间：
2019-01-01
影响因子：
3
通讯作者：
Mitsuya, Shiro
中科院分区：
文献类型：
--
作者：
Neang, Sarin;de Ocampo, Marjorie;Mitsuya, Shiro
水稻植株的盐敏感性与枝条中Na+和Cl-的积累量有关，更重要的是与光合组织中的Na+和Cl-积累量有关。因此，叶鞘水平的脱盐能力是耐盐的重要机制。在本研究中，我们试图确定水稻叶鞘是否排除Cl-和Na+，并确定参与这两种离子去除能力的组织。在耐盐型水稻FL478和敏感型水稻IR29中，根据叶鞘与叶片的比值估计，在NaCl处理下，叶鞘排除了Na+和Cl-。NaCl处理增加了鞘与叶片的Na+比值，但没有增加Cl-比值。NaCl处理下，叶基鞘Na+浓度较高，叶中和叶尖Cl-浓度较高。在组织水平上，高NaCl处理下叶鞘基本薄壁细胞保留的Na和Cl含量最高。这些结果表明，叶鞘可能具有从木质部血管沿轴的不同位置清除过量Na+和Cl-的功能，叶鞘的基本薄壁细胞参与了Na+和Cl-的过度积累。
Salt sensitivity in rice plants is associated with the accumulated amount of Na+ and Cl- in shoots and, more significantly, in photosynthetic tissues. Therefore, salt removal ability at the leaf sheath level is an important mechanism of salt tolerance. In the present study we attempted to determine whether rice leaf sheaths excluded Cl- as well as Na+, and to identify the tissues that were involved in the removal ability of both ions. In two rice genotypes, salt-tolerant FL478 and -sensitive IR29, leaf sheaths excluded Na+ and Cl- under NaCl treatment as estimated using their sheath:blade ratios. The sheath:blade ratio of Na+ but not of Cl-, was increased by NaCl treatment. Under NaCl treatment, Na+ concentration was higher in the basal leaf sheath, whereas Cl- concentration was higher in the middle and tip parts. At the tissue level, fundamental parenchyma cells of leaf sheaths retained the highest amounts of Na and Cl when treated with high amount of NaCl. These results imply that the leaf sheath potentially functions to remove excess Na+ and Cl- from xylem vessels in different locations along the axis, with the fundamental parenchyma cells of leaf sheaths being involved in over-accumulation of both Na+ and Cl-.