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Open AccessArticle

Broad-Spectrum Disease Resistance Conferred by the Overexpression of Rice RLCK BSR1 Results from an Enhanced Immune Response to Multiple MAMPs

1
Institute of Agrobiological Sciences, NARO (NIAS), Tsukuba 305-8602, Japan
2
Graduate School of Science and Technology, Tokyo University of Science, Noda 278-8510, Japan
*
Author to whom correspondence should be addressed.
Int. J. Mol. Sci. 2019, 20(22), 5523; https://doi.org/10.3390/ijms20225523
Received: 4 October 2019 / Revised: 31 October 2019 / Accepted: 4 November 2019 / Published: 6 November 2019
(This article belongs to the Special Issue Molecular Research in Rice: Agronomically Important Traits)
Plants activate their immune system through intracellular signaling pathways after perceiving microbe-associated molecular patterns (MAMPs). Receptor-like cytoplasmic kinases mediate the intracellular signaling downstream of pattern-recognition receptors. BROAD-SPECTRUM RESISTANCE 1 (BSR1), a rice (Oryza sativa) receptor-like cytoplasmic kinase subfamily-VII protein, contributes to chitin-triggered immune responses. It is valuable for agriculture because its overexpression confers strong disease resistance to fungal and bacterial pathogens. However, it remains unclear how overexpressed BSR1 reinforces plant immunity. Here we analyzed immune responses using rice suspension-cultured cells and sliced leaf blades overexpressing BSR1. BSR1 overexpression enhances MAMP-triggered production of hydrogen peroxide (H2O2) and transcriptional activation of the defense-related gene in cultured cells and leaf strips. Furthermore, the co-cultivation of leaves with conidia of the blast fungus revealed that BSR1 overexpression allowed host plants to produce detectable oxidative bursts against compatible pathogens. BSR1 was also involved in the immune responses triggered by peptidoglycan and lipopolysaccharide. Thus, we concluded that the hyperactivation of MAMP-triggered immune responses confers BSR1-mediated robust resistance to broad-spectrum pathogens. View Full-Text
Keywords: disease resistance; microbe-associated molecular pattern (MAMP); Pyricularia oryzae (formerly Magnaporthe oryzae); Oryza sativa (rice); receptor-like cytoplasmic kinase (RLCK); reactive oxygen species (ROS) disease resistance; microbe-associated molecular pattern (MAMP); Pyricularia oryzae (formerly Magnaporthe oryzae); Oryza sativa (rice); receptor-like cytoplasmic kinase (RLCK); reactive oxygen species (ROS)
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Kanda, Y.; Nakagawa, H.; Nishizawa, Y.; Kamakura, T.; Mori, M. Broad-Spectrum Disease Resistance Conferred by the Overexpression of Rice RLCK BSR1 Results from an Enhanced Immune Response to Multiple MAMPs. Int. J. Mol. Sci. 2019, 20, 5523.

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