Im Jong Hee, Choi Naeyeoung, Lee Jinjeong, Jung Man-Young, Park Sang Ryeol, Hwang Duk-Ju
National Institute of Agricultural Sciences, Rural Development Administration, Jeonju, 54874, Korea.
Interdisciplinary Graduate Programme in Advanced Convergence Technology and Science, Jeju National University, 102 Jejudaehak-ro, Jeju, 63243, Korea.
J Integr Plant Biol. 2025 Aug;67(8):2198-2213. doi: 10.1111/jipb.13940. Epub 2025 May 28.
Transcription activator-like effectors (TALEs) mimic eukaryotic transcriptional activators and translocate into host plant cells via the bacterial type III secretion system (T3SS) during pathogenic interactions. They play a crucial role in disease development by regulating host genes. Despite this, the regulatory mechanisms by which TALEs control OsWRKY transcription factors (TFs) remain poorly understood. In this study, we show that two TALEs from Xanthomonas oryzae pv. oryzae (Xoo) individually modulate two OsWRKY TFs, resulting in increased susceptibility and reduced host defense. Specifically, Xoo1219 and Xoo2145 activate the expression of OsWRKY104 and OsWRKY55, respectively, through direct interactions. OsWRKY104 increases the susceptibility to Xoo by activating OsSWEET11 and OsSWEET14, while OsWRKY55 suppresses host defense against Xoo by directly regulating OsWRKY62. These findings suggest that TALEs hijack the host's OsWRKY TFs to create a favorable environment for bacterial survival.
转录激活样效应因子(TALEs)模拟真核转录激活因子,并在致病相互作用期间通过细菌III型分泌系统(T3SS)转运到宿主植物细胞中。它们通过调控宿主基因在疾病发展中发挥关键作用。尽管如此,TALEs调控OsWRKY转录因子(TFs)的机制仍知之甚少。在本研究中,我们表明来自水稻白叶枯病菌(Xanthomonas oryzae pv. oryzae,Xoo)的两个TALEs分别调节两个OsWRKY TFs,导致易感性增加和宿主防御能力降低。具体而言,Xoo1219和Xoo2145分别通过直接相互作用激活OsWRKY104和OsWRKY55的表达。OsWRKY104通过激活OsSWEET11和OsSWEET14增加对Xoo的易感性,而OsWRKY55通过直接调节OsWRKY62抑制宿主对Xoo的防御。这些发现表明,TALEs劫持宿主的OsWRKY TFs以创造有利于细菌生存的环境。