KARRIKIN INSENSITIVE2 regulates leaf development, root system architecture and arbuscular‐mycorrhizal symbiosis in Brachypodium distachyon

Meng, Yongjie; Varshney, Kartikye; Incze, Norbert; Badics, Eszter; Kamran, Muhammad; Davies, Sabrina F.; Oppermann, Larissa M. F.; Magne, Kévin; Dalmais, Marion; Bendahmane, Abdel; Sibout, Richard; Vogel, John; Laudencia‐Chingcuanco, Debbie; Bond, Charles S.; Soós, Vilmos; Gutjahr, Caroline; Waters, Mark T.

doi:10.1111/tpj.15651

Title: KARRIKIN INSENSITIVE2 regulates leaf development, root system architecture and arbuscular‐mycorrhizal symbiosis in Brachypodium distachyon

Journal Article · 23 February 2022 · The Plant Journal

DOI: https://doi.org/10.1111/tpj.15651 · OSTI ID:1846215

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School of Molecular Sciences The University of Western Australia Perth WA 6009 Australia, College of Agronomy Sichuan Agricultural University Chengdu 611130 China
Plant Genetics TUM School of Life Sciences Technical University of Munich Freising 85354 Germany
Department of Biological Resources Agricultural Institute, Centre for Agricultural Research Martonvásár 2462 Hungary, Doctoral School of Biology Institute of Biology, ELTE Eötvös Loránd University Budapest 1117 Hungary
School of Molecular Sciences The University of Western Australia Perth WA 6009 Australia
Université Paris‐Saclay CNRS, INRAE, Univ Evry, Institute of Plant Sciences Paris‐Saclay (IPS2) Orsay 91405 France, Université de Paris, CNRS, INRAE, Institute of Plant Sciences Paris‐Saclay (IPS2) Orsay 91405 France
Institut Jean‐Pierre Bourgin, UMR1318 INRAE‐AgroParisTech Versailles Cedex F‐78026 France, UR1268 BIA, INRAE Nantes 44300 France
DOE Joint Genome Institute Berkeley California 94720 USA
USDA‐Agricultural Research Service, Western Regional Research Center Albany California 94710 USA
Department of Biological Resources Agricultural Institute, Centre for Agricultural Research Martonvásár 2462 Hungary

SUMMARY KARRIKIN INSENSITIVE2 (KAI2) is an α/β‐hydrolase required for plant responses to karrikins, which are abiotic butenolides that can influence seed germination and seedling growth. Although represented by four angiosperm species, loss‐of‐function kai2 mutants are phenotypically inconsistent and incompletely characterised, resulting in uncertainties about the core functions of KAI2 in plant development. Here we characterised the developmental functions of KAI2 in the grass Brachypodium distachyon using molecular, physiological and biochemical approaches. Bdkai2 mutants exhibit increased internode elongation and reduced leaf chlorophyll levels, but only a modest increase in water loss from detached leaves. Bdkai2 shows increased numbers of lateral roots and reduced root hair growth, and fails to support normal root colonisation by arbuscular‐mycorrhizal (AM) fungi. The karrikins KAR ₁ and KAR ₂ , and the strigolactone (SL) analogue rac ‐GR24, each elicit overlapping but distinct changes to the shoot transcriptome via BdKAI2. Finally, we show that BdKAI2 exhibits a clear ligand preference for desmethyl butenolides and weak responses to methyl‐substituted SL analogues such as GR24. Our findings suggest that KAI2 has multiple roles in shoot development, root system development and transcriptional regulation in grasses. Although KAI2‐dependent AM symbiosis is likely conserved within monocots, the magnitude of the effect of KAI2 on water relations may vary across angiosperms.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1846215

Journal Information:: The Plant Journal, Journal Name: The Plant Journal Journal Issue: 6 Vol. 109; ISSN 0960-7412

Publisher:: Wiley-BlackwellCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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