Auxin biosynthetic gene TAR2 is involved in low nitrogen-mediated reprogramming of root architecture in Arabidopsis

文献类型： 外文期刊

第一作者： Ma, Wenying

作者： Ma, Wenying;Li, Jingjuan;Qu, Baoyuan;He, Xue;Zhao, Xueqiang;Li, Bin;Fu, Xiangdong;Tong, Yiping;Li, Jingjuan

作者机构：

关键词： auxin biosynthesis; Arabidopsis thaliana; low nitrogen stress; lateral root; TAR2

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

ISSN： 0960-7412

年卷期： 2014 年 78 卷 1 期

页码：

收录情况： SCI

摘要： In plants, the plasticity of root architecture in response to nitrogen availability largely determines nitrogen acquisition efficiency. One poorly understood root growth response to low nitrogen availability is an observed increase in the number and length of lateral roots (LRs). Here, we show that low nitrogen-induced Arabidopsis LR growth depends on the function of the auxin biosynthesis gene TAR2 (tryptophan aminotransferase related 2). TAR2 was expressed in the pericycle and the vasculature of the mature root zone near the root tip, and was induced under low nitrogen conditions. In wild type plants, low nitrogen stimulated auxin accumulation in the non-emerged LR primordia with more than three cell layers and LR emergence. Conversely, these low nitrogen-mediated auxin accumulation and root growth responses were impaired in the tar2-c null mutant. Overexpression of TAR2 increased LR numbers under both high and low nitrogen conditions. Our results suggested that TAR2 is required for reprogramming root architecture in response to low nitrogen conditions. This finding suggests a new strategy for improving nitrogen use efficiency through the engineering of TAR2 expression in roots.

分类号： S9

  • 相关文献
作者其他论文 更多>>

微信小程序