Plant species-specific recognition of long and short β-1,3-linked glucans is mediated by different receptor systems.
Clicks: 281
ID: 80517
2020
Plants survey their environment for the presence of potentially harmful or beneficial microbes. During colonization, cell surface receptors perceive microbe-derived or modified-self ligands and initiate appropriate responses. The recognition of fungal chitin oligomers and the subsequent activation of plant immunity are well described. In contrast, the mechanisms underlying β-glucan recognition and signaling activation remain largely unexplored. Here, we systematically tested immune responses towards different β-glucan structures and show that responses vary between plant species. While leaves of the monocots Hordeum vulgare and Brachypodium distachyon can recognize longer (laminarin) and shorter (laminarihexaose) β-1,3-glucans with responses of varying intensity, duration and timing, leaves of the dicot Nicotiana benthamiana activate immunity in response to long β-1,3-glucans, whereas Arabidopsis thaliana and Capsella rubella perceive short β-1,3-glucans. Hydrolysis of the β-1,6 side branches of laminarin demonstrated that not the glycosidic decoration but rather the degree of polymerization plays a pivotal role in the recognition of long-chain β-glucans. Moreover, in contrast to the recognition of short β-1,3-glucan in A. thaliana, perception of long β-1,3-glucan in N. benthamiana and rice is independent of CERK1, indicating that β-glucan recognition may be mediated by multiple β-glucan receptor systems.
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| Authors | Wanke, Alan;Rovenich, Hanna;Schwanke, Florian;Velte, Stefanie;Becker, Stefan;Hehemann, Jan-Hendrik;Wawra, Stephan;Zuccaro, Alga; |
| Journal | The Plant journal : for cell and molecular biology |
| Year | 2020 |
| DOI | 10.1111/tpj.14688 |
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