In the evolution of land plants, the plant immune system has experienced expansion in immune receptor and signaling pathways. Lineage-specific expansions have been observed in diverse gene families that are potentially involved in immunity but lack causal association. Here, we show that Rps8-mediated resistance in barley to the pathogen Puccinia striiformis f. sp. tritici (wheat stripe rust) is conferred by a genetic module: Pur1 and Exo70FX12, which are together necessary and sufficient. Pur1 encodes a leucine-rich repeat receptor kinase and is the ortho-log of rice Xa21, and Exo70FX12 belongs to the Poales-specific Exo70FX clade. The Exo70FX clade emerged after the divergence of the Bromeliaceae and Poaceae and comprises from 2 to 75 members in sequenced grasses. These results demonstrate the requirement of a lineage-specific Exo70FX12 in Pur1-mediated immunity and sug-gest that the Exo70FX clade may have evolved a specialized role in receptor kinase signaling
A lineage-specific Exo70 is required for receptor kinase-mediated immunity in barley / Holden S.; Bergum M.; Green P.; Bettgenhaeuser J.; Hernandez-Pinzon I.; Thind A.; Clare S.; Russell J.M.; Hubbard A.; Taylor J.; Smoker M.; Gardiner M.; Civolani L.; Cosenza F.; Rosignoli S.; Strugala R.; Molnar I.; Simkova H.; Dolezel J.; Schaffrath U.; Barrett M.; Salvi S.; Moscou M.J.. - In: SCIENCE ADVANCES. - ISSN 2375-2548. - ELETTRONICO. - 8:27(2022), pp. abn7258.1-abn7258.12. [10.1126/sciadv.abn7258]
A lineage-specific Exo70 is required for receptor kinase-mediated immunity in barley
Civolani L.;Rosignoli S.;Salvi S.;
2022
Abstract
In the evolution of land plants, the plant immune system has experienced expansion in immune receptor and signaling pathways. Lineage-specific expansions have been observed in diverse gene families that are potentially involved in immunity but lack causal association. Here, we show that Rps8-mediated resistance in barley to the pathogen Puccinia striiformis f. sp. tritici (wheat stripe rust) is conferred by a genetic module: Pur1 and Exo70FX12, which are together necessary and sufficient. Pur1 encodes a leucine-rich repeat receptor kinase and is the ortho-log of rice Xa21, and Exo70FX12 belongs to the Poales-specific Exo70FX clade. The Exo70FX clade emerged after the divergence of the Bromeliaceae and Poaceae and comprises from 2 to 75 members in sequenced grasses. These results demonstrate the requirement of a lineage-specific Exo70FX12 in Pur1-mediated immunity and sug-gest that the Exo70FX clade may have evolved a specialized role in receptor kinase signaling| File | Dimensione | Formato | |
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Holden 2022 non host immunity barley SCIENCEADV.pdf
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