Light Dependency of Salinity-Induced Chloroplast Degradation
Light Dependency of Salinity-Induced Chloroplast Degradation
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DOI：
10.1626/pps.6.219
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发表时间：
2003-01
影响因子：
2.5
通讯作者：
Shiro Mitsuya;M. Kawasaki;M. Taniguchi;H. Miyake
中科院分区：
文献类型：
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作者：
Shiro Mitsuya;M. Kawasaki;M. Taniguchi;H. Miyake
摘要研究了光照和黑暗条件下不同浓度NaCl溶液对水稻幼苗Na、K、Cl、叶绿素含量及叶片超微结构的影响。幼苗首先在光照条件下在水中生长7 d，然后在不同浓度的NaCl溶液中在光照或黑暗条件下生长24 h。第3叶中Na和Cl含量随培养液中NaCl浓度的增加而增加，且光照条件下显著高于黑暗条件下。在两种条件下，K含量几乎不受NaCl浓度的影响。在光照条件下，幼苗第3叶叶绿素含量随培养液中NaCl浓度的增加而降低，但在黑暗条件下不随NaCl浓度的增加而降低。在NaCl溶液中生长的幼苗在光照条件下的第3叶中，叶肉细胞中叶绿体类囊体肿胀，呈波浪状排列。然而，在黑暗条件下，类囊体出现完整的盐条件下，虽然叶片积累了大量的Na和Cl比在光照条件下。目前的研究表明，在叶绿体中的损伤，如叶绿素含量的下降和类囊体的降解，是由光依赖性反应，而不是直接由过量的盐积累。
Abstract The contents of Na, K, CI, chlorophyll and the foliar ultrastructure of rice seedlings grown in NaCl solution at various concentrations were investigated under light and dark conditions. The seedlings were first grown in water for 7 d under a light condition and then in NaCl solutions at various concentrations for 24 h under a light or dark condition. The Na and CI contents in the 3rd leaves increased as the concentration of NaCl in the culture solution increased, and were significantly higher under a light condition than under a dark condition. The K content was scarcely influenced by the NaCl concentration under both conditions. The chlorophyll content in the 3rd leaves of the seedlings decreased as the NaCl concentrations of the culture solution increased under a light condition but not under a dark condition. In the 3rd leaves of the seedlings grown in the NaCl solution under a light condition, the thylakoids of chloroplasts in mesophyll cells were swollen and showed a wavy configuration. Under a dark condition, however, the thylakoids appeared intact under saline conditions although the leaves accumulated a large amount of Na and CI than in a light condition. The present study suggests that the damages in the chloroplasts, such as a decrease in the chlorophyll content and the degradation of thylakoids, were caused by a light-dependent reaction and not directly by accumulation of excess salt.