J Integr Plant Biol ›› 2017, Vol. 59 ›› Issue (5): 336-344.DOI: 10.1111/jipb.12537

• • 上一篇    

Transport of chemical signals in systemic acquired resistance

Archana Singh, Gah-Hyun Lim and Pradeep Kachroo*   

  • 收稿日期:2017-01-24 接受日期:2017-03-14 出版日期:2017-03-17 发布日期:2017-03-17

Transport of chemical signals in systemic acquired resistance

Archana Singh, Gah-Hyun Lim and Pradeep Kachroo*   

  1. Department of Plant Pathology, University of Kentucky, Lexington, Kentucky, USA
  • Received:2017-01-24 Accepted:2017-03-14 Online:2017-03-17 Published:2017-03-17
  • About author:*correspondence: E-mail: Pradeep Kachroo (pk62@uky.edu)

被引次数

10

摘要： Systemic acquired resistance (SAR) is a form of broad-spectrum resistance against plant pathogens that is regulated by signals including salicylic acid, azelaic acid and glycerol-3-phosphate. This review summarizes the role of these chemical signals in SAR and their differential transport through apoplasmic and symplasmic pathways.

Abstract:

Systemic acquired resistance (SAR) is a form of broad-spectrum resistance induced in response to local infections that protects uninfected parts against subsequent secondary infections by related or unrelated pathogens. SAR signaling requires two parallel branches, one regulated by salicylic acid (SA), and the other by azelaic acid (AzA) and glycerol-3-phosphate (G3P). AzA and G3P function downstream of the free radicals nitric oxide (NO) and reactive oxygen species (ROS). During SAR, SA, AzA and G3P accumulate in the infected leaves, but only a small portion of these is transported to distal uninfected leaves. SA is preferentially transported via the apoplast, whereas phloem loading of AzA and G3P occurs via the symplast. The symplastic transport of AzA and G3P is regulated by gating of the plasmodesmata (PD). The PD localizing proteins, PDLP1 and PDLP5, regulate SAR by regulating PD gating as well as the subcellular partitioning of a SAR-associated protein.

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