Journal
ANNUAL REVIEW OF PLANT BIOLOGY, VOL 72, 2021
Volume 72, Issue -, Pages 761-791Publisher
ANNUAL REVIEWS
DOI: 10.1146/annurev-arplant-081320-092855
Keywords
salicylic acid; plant immunity; SA receptors; SA biosynthesis; systemic acquired resistance; SA metabolism
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Funding
- NSERC-Discovery program
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Salicylic acid (SA) serves as a crucial plant defense hormone, playing essential roles in plant immunity against pathogens. Significant progress has been made in understanding the biosynthesis, perception, and receptor regulation of SA in recent years, but there are still key questions that need to be addressed in SA biosynthesis and signaling.
Salicylic acid (SA) is an essential plant defense hormone that promotes immunity against biotrophic and semibiotrophic pathogens. It plays crucial roles in basal defense and the amplification of local immune responses, as well as the establishment of systemic acquired resistance. During the past three decades, immense progress has been made in understanding the biosynthesis, homeostasis, perception, and functions of SA. This review summarizes the current knowledge regarding SA in plant immunity and other biological processes. We highlight recent breakthroughs that substantially advanced our understanding of how SA is biosynthesized from isochorismate, how it is perceived, and how SA receptors regulate different aspects of plant immunity. Some key questions in SA biosynthesis and signaling, such as how SA is produced via another intermediate, benzoic acid, and how SA affects the activities of its receptors in the transcriptional regulation of defense genes, remain to be addressed.
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