An LRR receptor kinase controls ABC transporter substrate preferences during plant growth-defense decisions.

Current biology : CB 2023 May 22

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The exporter of the auxin precursor indole-3-butyric acid (IBA), ABCG36/PDR8/PEN3, from the model plant Arabidopsis has recently been proposed to also function in the transport of the phytoalexin camalexin. Based on these bonafide substrates, it has been suggested that ABCG36 functions at the interface between growth and defense. Here, we provide evidence that ABCG36 catalyzes the direct, ATP-dependent export of camalexin across the plasma membrane. We identify the leucine-rich repeat receptor kinase, QIAN SHOU KINASE1 (QSK1), as a functional kinase that physically interacts with and phosphorylates ABCG36. Phosphorylation of ABCG36 by QSK1 unilaterally represses IBA export, allowing camalexin export by ABCG36 conferring pathogen resistance. As a consequence, phospho-dead mutants of ABCG36, as well as qsk1 and abcg36 alleles, are hypersensitive to infection with the root pathogen Fusarium oxysporum, caused by elevated fungal progression. Our findings indicate a direct regulatory circuit between a receptor kinase and an ABC transporter that functions to control transporter substrate preference during plant growth and defense balance decisions. Copyright © 2023 Elsevier Inc. All rights reserved.

Citation

Bibek Aryal, Jian Xia, Zehan Hu, Michael Stumpe, Tashi Tsering, Jie Liu, John Huynh, Yoichiro Fukao, Nina Glöckner, Hsin-Yao Huang, Gloria Sáncho-Andrés, Konrad Pakula, Joerg Ziegler, Karin Gorzolka, Marta Zwiewka, Tomasz Nodzynski, Klaus Harter, Clara Sánchez-Rodríguez, Michał Jasiński, Sabine Rosahl, Markus M Geisler. An LRR receptor kinase controls ABC transporter substrate preferences during plant growth-defense decisions. Current biology : CB. 2023 May 22;33(10):2008-2023.e8