Contribution of salicylic acid glucosyltransferase, OsSGT1, to chemically induced disease resistance in rice plants

Abstract Salicylic acid (SA) is required for resistance to many diseases in higher plants. SA-dependent cell death and defense-related responses have been correlated with disease resistance. The accelerated cell death 5 mutant of Arabidopsis provides additional genetic evidence that SA regulates cell death and defense-related responses. However, in acd5, these events are uncoupled from disease resistance. acd5 plants are more susceptible to Pseudomonas syringae early in development and show spontaneous SA accumulation, cell death, and defense-related markers later in development. In acd5 plants, cell death and defense-related responses are SA dependent but they do not confer disease resistance. Double mutants with acd5 and nonexpressor of PR1, in which SA signaling is partially blocked, show greatly attenuated cell death, indicating a role for NPR1 in controlling cell death. The hormone ethylene potentiates the effects of SA and is important for disease symptom development in Arabidopsis. Double mutants of acd5 and ethylene insensitive 2, in which ethylene signaling is blocked, show decreased cell death, supporting a role for ethylene in cell death control. We propose that acd5 plants mimic P. syringae-infected wild-type plants and that both SA and ethylene are normally involved in regulating cell death during some susceptible pathogen infections.

Download Full-text

The Jasmonic Acid Signaling Pathway is Associated with Terpinen-4-ol-Induced Disease Resistance against Botrytis cinerea in Strawberry Fruit

Journal of Agricultural and Food Chemistry ◽

10.1021/acs.jafc.1c04608 ◽

2021 ◽

Author(s):

Zhenbiao Li ◽

Yingying Wei ◽

Zidan Cao ◽

Shu Jiang ◽

Yi Chen ◽

...

Keyword(s):

Disease Resistance ◽

Jasmonic Acid ◽

Botrytis Cinerea ◽

Signaling Pathway ◽

Strawberry Fruit ◽

Jasmonic Acid Signaling ◽

Induced Disease Resistance

Download Full-text

Sweating treatment enhances citrus fruit disease resistance by inducing the accumulation of amino acids and salicylic acid-induced resistance pathway

Physiologia Plantarum ◽

10.1111/ppl.12340 ◽

2015 ◽

Vol 155 (2) ◽

pp. 109-125 ◽

Cited By ~ 8

Author(s):

Ze Yun ◽

Feng Zhu ◽

Ping Liu ◽

Yunliu Zeng ◽

Juan Xu ◽

...

Keyword(s):

Amino Acids ◽

Salicylic Acid ◽

Disease Resistance ◽

Induced Resistance ◽

Citrus Fruit ◽

Resistance Pathway ◽

Fruit Disease

Download Full-text

Suppression of Induced Resistance in Cucumber Through Disruption of the Flavonoid Pathway

Phytopathology ◽

10.1094/phyto-95-0114 ◽

2005 ◽

Vol 95 (1) ◽

pp. 114-123 ◽

Cited By ~ 36

Author(s):

Bourlaye Fofana ◽

Nicole Benhamou ◽

David J. McNally ◽

Caroline Labbé ◽

Armand Séguin ◽

...

Keyword(s):

Disease Resistance ◽

Induced Resistance ◽

De Novo ◽

Ultrastructural Changes ◽

Protein Accumulation ◽

Complete Suppression ◽

Flavonoid Pathway ◽

Induced Disease Resistance ◽

Key Enzyme ◽

Biochemical Analyses

In this study, cucumber plants (Cucumis sativus) expressing induced resistance against powdery mildew (caused by Podosphaera xanthii) were infiltrated with inhibitors of cinnamate 4-hydroxylase, 4-coumarate:CoA ligase (4CL), and chalcone synthase (CHS) to evaluate the role of flavonoid phytoalexin production in induced disease resistance. Light and transmission electron microscopy demonstrated ultrastructural changes in inhibited plants, and biochemical analyses determined levels of CHS and β-glucosidase enzyme activity and 4CL protein accumulation. Our results showed that elicited plants displayed a high level of induced resistance. In contrast, down regulation of CHS, a key enzyme of the flavonoid pathway, resulted in nearly complete suppression of induced resistance, and microscopy confirmed the development of healthy fungal haustoria within these plants. Inhibition of 4CL ligase, an enzyme largely responsible for channeling phenylpropanoid metabolites into the lignin pathway, had little effect on induced disease resistance. Biochemical analyses revealed similar levels of 4CL protein accumulation for all treatments, suggesting no alterations of nontargeted functions within inhibited plants. Collectively, the results of this study support the idea that induced resistance in cucumber is largely correlated with rapid de novo biosynthesis of flavonoid phytoalexin compounds.

Download Full-text