J Integr Plant Biol. ›› 2021, Vol. 63 ›› Issue (3): 583-596.DOI: 10.1111/jipb.13020

Special Issue: Development Hormone signaling Root development

• Research Articles • Previous Articles     Next Articles

Salicylic acid promotes quiescent center cell division through ROS accumulation and down‐regulation of PLT1, PLT2, and WOX5

Zhuqing Wang1,2, Duoyan Rong2,3, Dixing Chen1,2, Yang Xiao1,2, Renyi Liu2,4, Shuang Wu2 and Chizuko Yamamuro2*   

  1. 1College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou 350002, China
    2FAFU‐UCR Joint Center for Horticultural Biology and Metabolomics, Haixia Institute of Science and Technology, Fujian Agriculture and Forestry University, Fuzhou 350002, China
    3Hunan Engineering Research Centre of Lily Germplasm Resource in Novation and Deep Processing, College of Life Sciences and Chemistry, Hunan University of Technology, Zhuzhou 412007, China
    4Center for Agroforestry Mega Data Science, Haixia Institute of Science and Technology, Fujian Agriculture and Forestry University, Fuzhou 350002, China

    *Correspondence: Chizuko Yamamuro (c.yamamuro@fafu.edu.cn)
  • Received:2020-08-30 Accepted:2020-09-30 Online:2020-10-05 Published:2021-03-01

Abstract: Salicylic acid (SA) plays a crucial role in plant immunity. However, its function in plant development is poorly understood. The quiescent center (QC), which maintains columella stem cells (CSCs) in the root apical meristem and typically exhibits low levels of cell division, is critical for root growth and development. Here, we show that the Arabidopsis thaliana SA overaccumulation mutant constitutively activated cell death 1 (cad1), which exhibits increased cell division in the QC, is rescued by additional mutations in genes encoding the SA biosynthetic enzyme SALICYLIC ACID INDUCTION DEFFICIENT2 (SID2) or the SA receptor NONEXPRESSER OF PR GENES1 (NPR1), indicating that QC cell division in the cad1 mutant is promoted by the NPR1‐dependent SA signaling pathway. The application of exogenous SA also promoted QC cell division in wild‐type plants in a dose‐dependent manner and largely suppressed the expression of genes involved in QC maintenance, including those encoding the APETALA2 (AP2) transcription factors PLETHORA1 (PLT1) and PLT2, as well as the homeodomain transcription factor WUSCHEL‐RELATED HOMEOBOX5 (WOX5). Moreover, we showed that SA promotes reactive oxygen species (ROS) production, which is necessary for the QC cell division phenotype in the cad1 mutant. These results provide insight into the function of SA in QC maintenance.

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