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- Title
Plant immunity suppression by an exo-β-1,3-glucanase and an elongation factor 1α of the rice blast fungus.
- Authors
Liu, Hang; Lu, Xunli; Li, Mengfei; Lun, Zhiqin; Yan, Xia; Yin, Changfa; Yuan, Guixin; Wang, Xingbin; Liu, Ning; Liu, Di; Wu, Mian; Luo, Ziluolong; Zhang, Yan; Bhadauria, Vijai; Yang, Jun; Talbot, Nicholas J.; Peng, You-Liang
- Abstract
Fungal cell walls undergo continual remodeling that generates β-1,3-glucan fragments as products of endo-glycosyl hydrolases (GHs), which can be recognized as pathogen-associated molecular patterns (PAMPs) and trigger plant immune responses. How fungal pathogens suppress those responses is often poorly understood. Here, we study mechanisms underlying the suppression of β-1,3-glucan-triggered plant immunity by the blast fungus Magnaporthe oryzae. We show that an exo-β-1,3-glucanase of the GH17 family, named Ebg1, is important for fungal cell wall integrity and virulence of M. oryzae. Ebg1 can hydrolyze β-1,3-glucan and laminarin into glucose, thus suppressing β-1,3-glucan-triggered plant immunity. However, in addition, Ebg1 seems to act as a PAMP, independent of its hydrolase activity. This Ebg1-induced immunity appears to be dampened by the secretion of an elongation factor 1 alpha protein (EF1α), which interacts and co-localizes with Ebg1 in the apoplast. Future work is needed to understand the mechanisms behind Ebg1-induced immunity and its suppression by EF1α. Fungal cell walls release β-1,3-glucan fragments that trigger plant immunity. Here, the authors show that a glucanase (Ebg1) of the blast fungus Magnaporthe oryzae suppresses plant immunity by hydrolyzing β-1,3-glucan. At the same time, Ebg1 induces plant immune responses that are dampened by a fungal protein that interacts with Ebg1.
- Subjects
FUNGAL cell walls; DISEASE resistance of plants; RICE blast disease; BETA-glucans; FUNGAL proteins; FUNGI
- Publication
Nature Communications, 2023, Vol 14, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-023-41175-z