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Responses of rice growth to copper stress under free-air CO_2 enrichment (FACE)

机译：空气中CO_2富集（FACE）下水稻生长对铜胁迫的响应

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摘要

The responses of rice to the second degree contamination of copper were studied by pot experiments under free-air CO_2 enrichment (FACE) with 570 μmol • mol~(-1) of CO_2. The results showed that the content of copper in rice leaves was reduced with the CO_2 concentration reaching 570 μmol • mol~(-1) and this happened more significantly under the second degree contamination of copper. Under FACE, activities of superoxide dismutase (SOD) enzyme in rice leaves treated by copper contamination were induced, whereas the contents of glutathione (GSH) and glutathione disulfide (GSSG) had no significant difference from the control. In the presence of ambient CO_2, activities of SOD enzyme treated by copper pollution were suppressed during the whole rice growth, however, the contents of GSH and GSSG were induced at tillering and jointing stages, and then restored to the control levels in later growth under the second degree contamination of copper. With the rice growing, the content of malondialdehyde (MDA) rises continuously, but there had been no significant difference between the treatments at the same growth stage. Further studies are needed on the response mechanism of rice to Cu stress under elevated CO_2.
机译：通过盆栽试验研究了570μmol•mol〜（-1）的CO_2在空气中CO_2富集下水稻对铜二级污染的响应。结果表明，随着CO_2浓度达到570μmol•mol〜（-1），水稻叶片中的铜含量降低，这在铜的二次污染下更为明显。在FACE作用下，铜污染处理的水稻叶片中的超氧化物歧化酶（SOD）活性被诱导，而谷胱甘肽（GSH）和谷胱甘肽二硫化物（GSSG）的含量与对照无显着性差异。在环境CO_2存在下，铜污染处理过的SOD酶活性在整个水稻生长过程中受到抑制，但在分er和拔节期诱导了GSH和GSSG的含量，并在随后的生育期恢复到控制水平。铜的二级污染。随着水稻的生长，丙二醛（MDA）的含量不断增加，但在相同的生育阶段，两种处理之间没有显着差异。 CO_2升高对水稻对Cu胁迫的响应机制有待进一步研究。

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