Interactive Regulation of Hormone and Resistance Gene in Proline Metabolism Is Involved in Effector-Triggered Immunity or Disease Susceptibility in the Xanthomonas campestris pv. campestris - Brassica napus Pathosystem
To characterize cultivar variations in hormonal regulation of the transition between pattern-triggered immunity (PTI) and effector-triggered immunity or susceptibility (ETI or ETS), the responses of resistance (R-) genes, hydrogen peroxide, and proline metabolism in two cultivars to contrasting dise...
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Published in | Frontiers in plant science Vol. 12; p. 738608 |
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Main Authors | , , , , |
Format | Journal Article |
Language | English |
Published |
Switzerland
Frontiers Media S.A
10.01.2022
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Subjects | |
Online Access | Get full text |
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Summary: | To characterize cultivar variations in hormonal regulation of the transition between pattern-triggered immunity (PTI) and effector-triggered immunity or susceptibility (ETI or ETS), the responses of resistance (R-) genes, hydrogen peroxide, and proline metabolism in two
cultivars to contrasting disease susceptibility (resistant cv. Capitol vs. susceptible cv. Mosa) were interpreted as being linked to those of endogenous hormonal levels and signaling genes based on a time course of disease symptom development. Disease symptoms caused by the
pv.
(
) infections were much more developed in cv. Mosa than in cv. Capitol, as shown by an earlier appearance (at 3 days postinoculation [3 DPI]) and larger V-shaped necrosis lesions (at 9-15 DPI) in cv. Mosa. The cultivar variations in the R-genes, hormone status, and proline metabolism were found in two different phases (early [0-3 DPI] and later [9-15 DPI]). In the early phase,
significantly upregulated PTI-related cytoplasmic kinase (Botrytis-induced kinase-1 [
]) expression (+6.3-fold) with salicylic acid (SA) accumulation in cv. Capitol, while relatively less (+2.6-fold) with highly increased jasmonic acid (JA) level in cv. Mosa. The
-responsive proline accumulation in both cultivars was similar to upregulated expression of proline synthesis-related genes (
and
). During the later phase in cv. Capitol,
-responsive upregulation of
(a coiled-coil-nucleotide binding site-leucine-rich repeat [CC-NB-LRR-type R-gene]) was concomitant with a gradual increase in JA levels without additional proline accumulation. However, in cv. Mosa, upregulation of
(a toll/interleukin-1 receptor-nucleotide binding site-leucine-rich repeat [TIR-NB-LRR-type R-gene]) was consistent with an increase in SA and abscisic acid (ABA) levels and resulted in an antagonistic depression of JA, which led to a proline accumulation. These results indicate that
-induced
and
-mediated JA signaling interactions provide resistance and confirm ETI, whereas
and
enhanced SA- and/or ABA-mediated proline accumulation is associated with disease susceptibility (ETS). |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 Edited by: Wei-Hua Tang, Center for Excellence in Molecular Plant Sciences, Chinese Academy of Sciences (CAS), China Reviewed by: Lili Zhang, Institute of Microbiology, Chinese Academy of Sciences (CAS), China; Benbo Xu, Yangtze University, China This article was submitted to Plant Pathogen Interactions, a section of the journal Frontiers in Plant Science |
ISSN: | 1664-462X 1664-462X |
DOI: | 10.3389/fpls.2021.738608 |