An immune receptor complex evolved in soybean to perceive a polymorphic bacterial flagellin

Yali Wei, Alexandra Balaceanu, Jose S. Rufian, Cécile Segonzac, Achen Zhao, Rafael J. L. Morcillo and Alberto P. Macho ()
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Yali Wei: Chinese Academy of Sciences
Alexandra Balaceanu: Institute for Research in Biomedicine (IRB Barcelona), The Barcelona Institute of Science and Technology (BIST)
Jose S. Rufian: Chinese Academy of Sciences
Cécile Segonzac: Seoul National University
Achen Zhao: Chinese Academy of Sciences
Rafael J. L. Morcillo: Chinese Academy of Sciences
Alberto P. Macho: Chinese Academy of Sciences

Nature Communications, 2020, vol. 11, issue 1, 1-11

Abstract: Abstract In both animals and plants, the perception of bacterial flagella by immune receptors elicits the activation of defence responses. Most plants are able to perceive the highly conserved epitope flg22 from flagellin, the main flagellar protein, from most bacterial species. However, flagellin from Ralstonia solanacearum, the causal agent of the bacterial wilt disease, presents a polymorphic flg22 sequence (flg22Rso) that avoids perception by all plants studied to date. In this work, we show that soybean has developed polymorphic versions of the flg22 receptors that are able to perceive flg22Rso. Furthermore, we identify key residues responsible for both the evasion of perception by flg22Rso in Arabidopsis and the gain of perception by the soybean receptors. Heterologous expression of the soybean flg22 receptors in susceptible plant species, such as tomato, enhances resistance to bacterial wilt disease, demonstrating the potential of these receptors to enhance disease resistance in crop plants.

Date: 2020
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DOI: 10.1038/s41467-020-17573-y

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