School of Life Sciences, University of Science and Technology of China, Hefei 230027, China.
Nat Commun. 2014 Dec 19;5:5833. doi: 10.1038/ncomms6833.
Jasmonic acid (JA) is well known to promote lateral root formation but the mechanisms by which JA signalling is integrated into the pathways responsible for lateral root formation, and how it interacts with auxin in this process remains poorly understood. Here, we report that the highly JA-responsive ethylene response factor 109 (ERF109) mediates cross-talk between JA signalling and auxin biosynthesis to regulate lateral root formation in Arabidopsis. erf109 mutants have fewer lateral roots under MeJA treatments compared with wild type whereas ERF109 overexpression causes a root phenotype that resembles those of auxin overproduction mutants. ERF109 binds directly to GCC-boxes in the promoters of ASA1 and YUC2, which encode two key enzymes in auxin biosynthesis. Thus, our study reveals a molecular mechanism for JA and auxin cross-talk during JA-induced lateral root formation.
茉莉酸（JA）是众所周知的促进侧根形成，但 JA 信号转导如何整合到负责侧根形成的途径中，以及它如何在这个过程中与生长素相互作用，仍然知之甚少。在这里，我们报告说，高度响应 JA 的乙烯响应因子 109（ERF109）介导 JA 信号转导和生长素生物合成之间的串扰，以调节拟南芥的侧根形成。与野生型相比，erf109 突变体在 MeJA 处理下的侧根较少，而 ERF109 过表达导致类似于生长素过表达突变体的根表型。ERF109 直接结合到编码生长素生物合成中两个关键酶的 ASA1 和 YUC2 启动子中的 GCC 盒上。因此，我们的研究揭示了 JA 诱导侧根形成过程中 JA 和生长素串扰的分子机制。
