Insight into mechanism of lanthanum (III) induced damage to plant photosynthesis.,Ecotoxicology and Environmental Safety |
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Insight into mechanism of lanthanum (III) induced damage to plant photosynthesis.,Ecotoxicology and Environmental Safety
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A great deal of literature is available regarding the environmental and ecological effects of rare earth element pollution on plants. These studies have shown that excess lanthanum (La) (III) in the environment can inhibit plant growth and even cause plant death. Moreover, inhibition of plant photosynthesis is known to be one of the physiological bases of these damages. However, the mechanism responsible for these effects is still unclear. In this study, the mechanism of La(III)-induced damage to plant photosynthesis was clarified from the viewpoint of the chloroplast ultrastructure, the contents of chloroplast mineral elements and chlorophyll, the transcription of chloroplast ATPase subunits and chloroplast Mg(2+)-ATPase activity, in which rice was selected as a study object. Following treatment with low level of La(III), the chloroplast ultrastructure of rice was not changed, and the contents of chloroplast mineral elements (Mg, P, K, Ca, Mn, Fe, Ni, Cu, and Zn) increased, but the chlorophyll content did not change significantly. Moreover, the transcription of chloroplast ATPase subunits, chloroplast Mg(2+)-ATPase activity, the net photosynthetic rate and growth indices increased. Following treatment with high levels of La(III), the chloroplast ultrastructure was damaged, chloroplast mineral elements (except Cu and Zn) and chlorophyll contents decreased, and the transcription of chloroplast ATPase subunits, chloroplast Mg(2+)-ATPase activity, the net photosynthetic rate and growth indices decreased. Based on these results, a possible mechanism of La(III)-induced damage to plant photosynthesis was proposed to provide a reference for scientific evaluation of the potential ecological risk of rare earth elements in the environment.
中文翻译：
关于稀土元素污染对植物的环境和生态影响，已有大量文献可供参考。这些研究表明，环境中过量的镧（La）（III）会抑制植物的生长，甚至导致植物死亡。此外，已知抑制植物光合作用是这些损害的生理基础之一。但是，造成这些影响的机制仍不清楚。在这项研究中，从叶绿体超微结构，叶绿体矿物质元素和叶绿素的含量，叶绿体ATPase亚基的转录和叶绿体Mg（2 +）-的角度，阐明了La（III）诱导的植物光合作用受损的机理。 ATPase活性，其中水稻被选作研究对象。用低水平的La（III）处理后，水稻的叶绿体超微结构没有变化，叶绿体矿质元素（Mg，P，K，Ca，Mn，Fe，Ni，Cu和Zn）的含量增加，但叶绿素含量没有明显变化。此外，叶绿体ATPase亚基的转录，叶绿体Mg（2 +）-ATPase活性，净光合速率和生长指数增加。高水平的La（III）处理后，叶绿体超微结构受到破坏，叶绿体矿物质元素（铜和锌除外）和叶绿素含量降低，叶绿体ATPase亚基的转录，叶绿体Mg（2 +）-ATPase活性，净光合速率和生长指数下降。根据这些结果， |
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