Broad-Spectrum Disease Resistance Conferred by the Overexpression of Rice RLCK BSR1 Results from an Enhanced Immune Response to Multiple MAMPs
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 (...
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doaj-3e2237b6303746c6a4e13e116d506f482020-11-25T01:18:38ZengMDPI AGInternational Journal of Molecular Sciences1422-00672019-11-012022552310.3390/ijms20225523ijms20225523Broad-Spectrum Disease Resistance Conferred by the Overexpression of Rice RLCK BSR1 Results from an Enhanced Immune Response to Multiple MAMPsYasukazu Kanda0Hitoshi Nakagawa1Yoko Nishizawa2Takashi Kamakura3Masaki Mori4Institute of Agrobiological Sciences, NARO (NIAS), Tsukuba 305-8602, JapanInstitute of Agrobiological Sciences, NARO (NIAS), Tsukuba 305-8602, JapanInstitute of Agrobiological Sciences, NARO (NIAS), Tsukuba 305-8602, JapanGraduate School of Science and Technology, Tokyo University of Science, Noda 278-8510, JapanInstitute of Agrobiological Sciences, NARO (NIAS), Tsukuba 305-8602, JapanPlants 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 (<i>Oryza sativa</i>) 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 (H<sub>2</sub>O<sub>2</sub>) 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.https://www.mdpi.com/1422-0067/20/22/5523disease resistancemicrobe-associated molecular pattern (mamp)<i>pyricularia oryzae</i> (formerly <i>magnaporthe oryzae</i>)<i>oryza sativa</i> (rice)receptor-like cytoplasmic kinase (rlck)reactive oxygen species (ros) |
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DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Yasukazu Kanda Hitoshi Nakagawa Yoko Nishizawa Takashi Kamakura Masaki Mori |
spellingShingle |
Yasukazu Kanda Hitoshi Nakagawa Yoko Nishizawa Takashi Kamakura Masaki Mori Broad-Spectrum Disease Resistance Conferred by the Overexpression of Rice RLCK BSR1 Results from an Enhanced Immune Response to Multiple MAMPs International Journal of Molecular Sciences disease resistance microbe-associated molecular pattern (mamp) <i>pyricularia oryzae</i> (formerly <i>magnaporthe oryzae</i>) <i>oryza sativa</i> (rice) receptor-like cytoplasmic kinase (rlck) reactive oxygen species (ros) |
author_facet |
Yasukazu Kanda Hitoshi Nakagawa Yoko Nishizawa Takashi Kamakura Masaki Mori |
author_sort |
Yasukazu Kanda |
title |
Broad-Spectrum Disease Resistance Conferred by the Overexpression of Rice RLCK BSR1 Results from an Enhanced Immune Response to Multiple MAMPs |
title_short |
Broad-Spectrum Disease Resistance Conferred by the Overexpression of Rice RLCK BSR1 Results from an Enhanced Immune Response to Multiple MAMPs |
title_full |
Broad-Spectrum Disease Resistance Conferred by the Overexpression of Rice RLCK BSR1 Results from an Enhanced Immune Response to Multiple MAMPs |
title_fullStr |
Broad-Spectrum Disease Resistance Conferred by the Overexpression of Rice RLCK BSR1 Results from an Enhanced Immune Response to Multiple MAMPs |
title_full_unstemmed |
Broad-Spectrum Disease Resistance Conferred by the Overexpression of Rice RLCK BSR1 Results from an Enhanced Immune Response to Multiple MAMPs |
title_sort |
broad-spectrum disease resistance conferred by the overexpression of rice rlck bsr1 results from an enhanced immune response to multiple mamps |
publisher |
MDPI AG |
series |
International Journal of Molecular Sciences |
issn |
1422-0067 |
publishDate |
2019-11-01 |
description |
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 (<i>Oryza sativa</i>) 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 (H<sub>2</sub>O<sub>2</sub>) 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. |
topic |
disease resistance microbe-associated molecular pattern (mamp) <i>pyricularia oryzae</i> (formerly <i>magnaporthe oryzae</i>) <i>oryza sativa</i> (rice) receptor-like cytoplasmic kinase (rlck) reactive oxygen species (ros) |
url |
https://www.mdpi.com/1422-0067/20/22/5523 |
work_keys_str_mv |
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