Systemin-mediated long-distance systemic defense responses

Systemin, a peptide plant hormone of 18 amino acids, coordinates local and systemic immune responses. The activation of the canonical systemin-mediated systemic signaling pathway involves systemin release from its precursor prosystemin, systemin binding to its membrane receptor SYSTEMIN RECEPTOR1 (S...

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Bibliographic Details
Published in:The New phytologist 2020-06, Vol.226 (6), p.1573-1582
Main Authors: Zhang, Haiyan, Zhang, Hui, Lin, Jinxing
Format: Article
Language:English
Subjects:
Amino acids
Distance
Gene Expression Regulation, Plant
Hormones
Immune response
Jasmonic acid
Lycopersicon esculentum - metabolism
mRNA
Organic compounds
Peptides - metabolism
Plant growth substances
Plant hormones
Plant Proteins - metabolism
protein processing
Receptors
receptor‐like kinase
Research review
Secretion
Signal transduction
Signaling
systemic defense
systemin
VOCs
Volatile organic compounds
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Summary:Systemin, a peptide plant hormone of 18 amino acids, coordinates local and systemic immune responses. The activation of the canonical systemin-mediated systemic signaling pathway involves systemin release from its precursor prosystemin, systemin binding to its membrane receptor SYSTEMIN RECEPTOR1 (SYR1), and the transport of long-distance signaling molecules, including jasmonic acid, the prosystemin mRNA, volatile organic compounds and possibly systemin itself. Here, we review emerging evidence that the disordered structure and unconventional processing and secretion of systemin contribute to the regulation of systemin-mediated signaling during plant defense. We highlight recent advances in systemin research, which elucidated how cells integrate multiple long-distance signals into the systemic defense response. In addition, we discuss the perception of systemin by SYR1 and its mediation of downstream defense responses.
ISSN:0028-646X
1469-8137
DOI:10.1111/nph.16495