Response of amino acid changes in Aphis gossypii (Glover) to elevated CO2 levels
Response of amino acid changes in Aphis gossypii (Glover) to elevated CO2 levels
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DOI：
10.1111/j.1439-0418.2008.01341.x
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发表时间：
2009-04
影响因子：
1.9
通讯作者：
Yucheng Sun;B. Jing;F. Ge
中科院分区：
文献类型：
--
作者：
Yucheng Sun;B. Jing;F. Ge
研究了CO2浓度升高对棉蚜Aphis gossypii（格洛弗）氨基酸组分的影响，棉蚜以转Bt基因棉花[Cryl A（c）]为食，在封闭动态CO2室中生长于环境CO2浓度和双环境CO2浓度下。在CO2浓度升高的条件下，棉花韧皮部中的氨基酸含量低于环境CO2浓度下的含量。然而，在A.结果表明，CO2浓度升高对棉株蜜露中氨基酸含量的影响不显著。高浓度CO2处理下取食叶片的棉蚜产生的蜜露量大于常温CO2处理下取食叶片的棉蚜。CO_2浓度升高时，棉花韧皮部的C：N比增加，从而使棉蚜对棉花韧皮部的摄食量增加。除赖氨酸和精氨酸两种碱性氨基酸外，两种CO2处理下蚜虫体内氨基酸组成基本相同。这表明韧皮部汁液的营养成分对A.棉。我们的数据表明，更多的韧皮部汁液将被A。在CO2浓度升高的情况下，棉花的营养需求和氨基酸的盈亏平衡点都得到了满足。A. CO2浓度升高会降低棉株的光合作用，导致部分虫霉的发生。
Effects of elevated CO2 levels on the amino acid constituents of cotton aphid, Aphis gossypii (Glover), fed on transgenic Bacillus thuringiensis (Berliner) (Bt) cotton [Cryl A(c)], grown in ambient and double‐ambient CO2 levels in closed‐dynamics CO2 chambers, were investigated. Lower amounts of amino acids were found in cotton phloem under elevated CO2 than under ambient CO2 levels. However, higher amounts of free amino acids were found in A. gossypii fed on elevated CO2‐grown cotton than those fed ambient CO2‐grown cotton, and the contents of amino acids in honeydew were not significantly affected by elevated CO2 levels. A larger amount of honeydew was produced by cotton aphids feeding on leaves under elevated CO2 treatment than those feeding on leaves under ambient CO2 treatment, which indicates that A. gossypii ingests more cotton phloem because of the higher C:N ratio of cotton phloem under elevated CO2 levels. Moreover, the amino acid composition was similar in bodies of aphids ingesting leaves under both CO2 treatments, except for two alkaline amino acids, lysine and arginine. This suggests that the nutritional constitution of the phloem sap was important for A. gossypii. Our data suggest that more phloem sap will be ingested by A. gossypii to satisfy its nutritional requirement and balance the break‐even point of amino acid in elevated CO2. Larger amounts of honeydew produced by A. gossypii under elevated CO2 will reduce the photosynthesis and result in the occurrence of some Entomophthora spp.