Dysfunction of the 4-coumarate:coenzyme A ligase 4CL4 impacts aluminum resistance and lignin accumulation in rice

文献类型： 外文期刊

第一作者： Liu, Shuo

作者： Liu, Shuo;Zhao, Li;Liao, Yonghui;Luo, Zhenling;Huang, Chao-Feng;Liu, Shuo;Zhao, Li;Liao, Yonghui;Luo, Zhenling;Huang, Chao-Feng;Liu, Shuo;Wang, Peng;Huang, Chao-Feng;Wang, Hua;Zhao, Han;Xia, Jixing

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关键词： aluminum resistance; 4-Coumarate; Coenzyme A Ligase 4; cell wall; hydroxycinnamic acids; lignin; Oryza sativa

期刊名称：PLANT JOURNAL （ 影响因子：6.417； 五年影响因子：7.627 ）

ISSN： 0960-7412

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收录情况： SCI

摘要： The root cell wall is the first and primary target of aluminum (Al) toxicity. Monocots such as rice (Oryza sativa) can accumulate appreciable levels of hydroxycinnamic acids (HCAs) to modify and cross-link hemicellulose and/or lignin of the cell wall. Nevertheless, it is unclear whether this HCA-mediated modification of the cell wall is important for Al accumulation and resistance. We previously isolated and characterized a riceral1(resistance toaluminum1) mutant that shows enhanced Al resistance. In this study, we clonedRAL1and found that it encodes the 4-coumarate:coenzyme A ligase 4CL4, an enzyme putatively involved in lignin biosynthesis. Mutation ofRAL1/4CL4reduces lignin content and increases the accumulation of its substrates 4-coumaric acid (PA) and ferulic acid (FA). We demonstrate that altered lignin accumulation is not required for the enhanced Al resistance inral1/4cl4mutants. We found that the increased accumulation of PA and FA can reduce Al binding to hemicellulose and consequently enhance Al resistance inral1/4cl4mutants. Al stress is able to trigger PA and FA accumulation, which is likely caused by the repression of the expression ofRAL1/4CL4and its homologous genes. Our results thus reveal that Al-induced PA and FA accumulation is actively and positively involved in Al resistance in rice through the modification of the cell wall and thereby the reduced Al binding to the cell wall.

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