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Common and divergent shoot-root signalling in legume symbioses

journal contribution
posted on 2023-05-18, 17:00 authored by Eloise FooEloise Foo, Heynen, EMH, James ReidJames Reid
  • The role of shoot–root signals in the control of nodulation and arbuscular mycorrhizal (AM) development were examined in the divergent legume species pea and blue lupin. These species were chosen as pea can host both symbionts, whereas lupin can nodulate but has lost the ability to form AM.
  • Intergeneric grafts between lupin and pea enabled examination of key long-distance signals in these symbioses. The role of strigolactones, auxin and elements of the autoregulation of nodulation (AON) pathway were investigated. Grafting studies were combined with loss-of-function mutants to monitor symbioses (nodulation, AM) and hormone effects (levels, gene expression and application studies).
  • Lupin shoots suppress AM colonization in pea roots, in part by downregulating strigolactone exudation involving reduced expression of the strigolactone biosynthesis gene PsCCD8. By contrast, lupin shoots enhance pea nodulation, independently of strigolactones, possibly due to a partial incompatibility in AON shoot–root signalling between pea and lupin.
  • This study highlights that nodulation and AM symbioses can be regulated independently and this may be due to long-distance signals, a phenomenon we were able to uncover by working with divergent legumes. We also identify a role for strigolactone exudation in determining the status of non-AM hosts.
  • Funding

    Australian Research Council

    History

    Publication title

    New Phytologist

    Volume

    210

    Pagination

    643-656

    ISSN

    0028-646X

    Department/School

    School of Natural Sciences

    Publisher

    Wiley-Blackwell Publishing Ltd.

    Place of publication

    United Kingdom

    Rights statement

    Copyright 2015 The Authors

    Repository Status

    • Restricted

    Socio-economic Objectives

    Environmentally sustainable plant production not elsewhere classified

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