Journal
CURRENT OPINION IN PLANT BIOLOGY
Volume 72, Issue -, Pages -Publisher
CURRENT BIOLOGY LTD
DOI: 10.1016/j.pbi.2023.102349
Keywords
Salicylic acid biosynthesis; Pathogen defense; Populus; Thioredoxin; Redox signaling; SA-JA synergism
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This review examines the differences in salicylic acid (SA) synthesis between Arabidopsis and poplar, focusing on the phenylalanine ammonia-lyase (PAL) pathway and the isochorismate synthase (ICS) pathway. It discusses potential factors influencing SA diversity in plant defense and suggests future research directions.
The phytohormone salicylic acid (SA) is known to regulate plant immunity against pathogens. Plants synthesize SA via the isochorismate synthase (ICS) pathway or the phenylala-nine ammonia-lyase (PAL) pathway. The ICS pathway has been fully characterized using Arabidopsis thaliana, a model plant that exhibits pathogen-inducible SA accumulation. Many species including Populus (poplar) depend instead on the partially understood PAL pathway for constitutive as well as pathogen-stimulated SA synthesis. Diversity of SA-mediated defense is also evident in SA accumulation, redox regulation, and interplay with other hormones like jasmonic acid. This review highlights the contrast between Arabidopsis and poplar, discusses potential drivers of SA diversity in plant defenses, and offers future research directions.
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