Research on Root Responses to Pb and Zn Combined Stress of Carex putuoshan

文献类型： 外文期刊

第一作者： Hu, Yong-Lin

作者： Hu, Yong-Lin;Tan, Jia-Lang;Yang, Zhan-Biao;Yang, Yuan-Xiang;Chen, Zhang;Lin, Li-Jin;Wang, Ying-Jun;Sun, Gang;Zhu, Xue-Mei;Wang, Cheng-Long;Shao, Ji-Rong;Zhou, Mei-Liang

作者机构：

关键词： Carex putuoshan;Expression analysis;Pb and Zn combined stress;Phytochelatin synthase gene;Proteomics;Two-dimensional gel electrophoresis

期刊名称：PROTEIN AND PEPTIDE LETTERS （ 影响因子：1.89； 五年影响因子：1.528 ）

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收录情况： SCI

摘要： Pb hyper-accumulated Carex putuoshan was taken as experimental material and subjected to combined stress of Pb and Zn. The differential expression of proteins in their roots were analyzed by Proteomic Approach. The protein that was directly involved in the cellular defense under the Pb and Zn combined stress was separated, and expression of those genes was analyzed with Carex Ever-gold as control. The results were obtained by MALDI-TOF/MS analysis. After applying Pb and Zn combined stress, the expression of 9 protein spots (including 7 different proteins, 2 identical proteins, 1 unknown protein) in Carex putuoshan root was found to be significantly up-regulated. Five proteins were obtained from the 9 proteins related to carbohydrate metabolism, including malate dehydrogenase, glyceraldehyde-3-phosphate dehydrogenase, frutose-1,6-bisphosphate aldolase, enolase, and 6- phosphogluconate dehydrogenase. Two proteins were related to protein biosynthesis, including isoflavone reductase and phytochelatin synthase (PCS). From these proteins, the most important protein is PCS, which is a key enzyme in the synthesis of phytochelatins (PCs) and plays an important role in chelation. It is directly involved in cellular defense under Pb and Zn stress. After Pb and Zn combined stress, the CpPCS in Carex putuoshan was cloned. The full length of cDNA is 1461 bps, and it encodes 486 amino acids with molecular weight of 53.86 kD and pI value of 6.12. Two typical phytochelatin synthase subfamily domains constitute CpPCS protein, which includes three adjacent Cys-Cys elements in the C-terminal region. Phylogenetic analysis of PCS proteins from different species showed that it had the closest relationship with the Oryza sativa and Triticum aestivum. Real-time quantitative PCR analysis indicated that CpPCS and CePCS (Carex Evergold) genes were expressed in the root. The CpPCS and CePCS genes were up-regulated by Pb and Zn treatments. The expression of CpPCS was higher than that of CePCS under the same condition. The study found that CpPCS expression was increased by Pb and Zn stress in the Carex putuoshan enrichment process of Pb, which lead to high expression of PCS protein. CpPCS improved the accumulation ability and resistance of Carex putuoshan to heavy metals with the expression level of glucose metabolism related proteins increasing after Pb and Zn stress.

分类号： Q51

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