Integrating nitric oxide into salicylic acid and jasmonic acid/ ethylene plant defence pathways.

Frontiers in Plant Science

Kim Henrik eHebelstrup¹  Sandra ePierre²  Luis A.J. Mur²  Michael Anthony Hall²  Elena ePrats³ 

[1] Aarhus University;Aberystywyth University;CSIC;

关键词: Ethylenes;    Nitric Oxide;    pathogens;    Jasmonic acid;    resistance mechanisms;    Signaling Pathways;   

DOI  :  10.3389/fpls.2013.00215

来源: DOAJ

【 摘 要 】

Plant defence against pests and pathogens is known to be conferred by either salicylic acid (SA) or jasmonic acid (JA)/ethylene (ET) pathways, depending on infection or herbivore-grazing strategy.It is well attested that SA and JA/ET pathways are mutually antagonistic allowing defence responses to be tailored to particular biotic stresses. Nitric oxide (NO) has emerged as a major signal influencing resistance mediated by both signalling pathways but no attempt has been made to integrate NO into established SA/JA/ET interactions. NO has been shown to act as an inducer or suppressor of signalling along each pathway. NO will initiate SA biosynthesis and nitrosylate key cysteines on TGA-class transcription factors to aid in the initiation of SA—dependent gene expression. Against this, S-nitrosylation of NONEXPRESSOR OF PATHOGENESIS-RELATED PROTEINS1 (NPR1) will promote the NPR1 oligomerisation within the cytoplasm to reduce TGA activation. In JA biosynthesis, NO will initiate the expression of JA biosynthetic enzymes, presumably to over-come any antagonistic effects of SA on JA-mediated transcription. NO will also initiate the expression of ET biosynthetic genes but a suppressive role is also observed in the S –nitrosylation and inhibition of s-adenosylmethionine transferases which provides methyl groups for ethylene production.Based on these data a model for NO action is proposed but we have also highlighted the need to understand when and how inductive and suppressive steps are used.

【 授权许可】

Unknown