Role and mechanisms of callose priming in mycorrhiza-induced resistance.
Botrytis cinerea
callose
mycorrhiza-induced resistance
priming
starch degradation
sugar transport
Journal
Journal of experimental botany
ISSN: 1460-2431
Titre abrégé: J Exp Bot
Pays: England
ID NLM: 9882906
Informations de publication
Date de publication:
09 05 2020
09 05 2020
Historique:
received:
19
07
2019
accepted:
11
03
2020
pubmed:
28
1
2020
medline:
15
5
2021
entrez:
28
1
2020
Statut:
ppublish
Résumé
Mycorrhizal plants display enhanced resistance to several pathogens. However, the molecular mechanisms regulating mycorrhiza-induced resistance (MIR) are still elusive. We aim to study the mechanisms underlying MIR against Botrytis cinerea and the role of callose accumulation during this process. Mycorrhizal tomato plants inoculated with Rhizoglomus irregularis displayed callose priming upon B. cinerea infection. The callose inhibitor 2-deoxy-d-glucose abolished MIR, confirming the relevance of callose in the bioprotection phenomena. While studying the mechanisms underlying mycorrhiza-induced callose priming, we found that mycorrhizal plants display an enhanced starch degradation rate that is correlated with increased levels of β-amylase1 transcripts following pathogen infection. Starch mobilization in mycorrhizal plants seems coordinated with the increased transcription of sugar transporter and invertase genes. Moreover, the expression levels of genes encoding the vesicular trafficking proteins ATL31 and SYP121 and callose synthase PMR4 were higher in the mycorrhizal plants and further boosted by subsequent pathogen infection. All these proteins play a key role in the priming of callose accumulation in Arabidopsis, suggesting that callose priming is an induced resistance mechanism conserved in different plant species. This evidence highlights the importance of sugar mobilization and vesicular trafficking in the priming of callose as a defence mechanism in mycorrhiza-induced resistance.
Identifiants
pubmed: 31985797
pii: 5716275
doi: 10.1093/jxb/eraa030
pmc: PMC7210776
doi:
Substances chimiques
Glucans
0
callose
9064-51-1
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
2769-2781Informations de copyright
© The Author(s) 2020. Published by Oxford University Press on behalf of the Society for Experimental Biology.
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