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Common and divergent shoot–root signalling in legume symbioses

Citation

Foo, E and Heynen, EMH and Reid, JB, Common and divergent shoot-root signalling in legume symbioses, New Phytologist, 210, (2) pp. 643-656. ISSN 0028-646X (2016) [Refereed Article]

Copyright Statement

Copyright 2015 The Authors

DOI: doi:10.1111/nph.13779

Abstract

  • 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.
  • Item Details

    Item Type:Refereed Article
    Keywords:strigolactone, nodulation, mycorrhiza, autoregulation of nodulation, lupin, pea, grafting, auxin
    Research Division:Biological Sciences
    Research Group:Plant Biology
    Research Field:Plant Physiology
    Objective Division:Plant Production and Plant Primary Products
    Objective Group:Environmentally Sustainable Plant Production
    Objective Field:Environmentally Sustainable Plant Production not elsewhere classified
    Author:Foo, E (Dr Eloise Foo)
    Author:Heynen, EMH (Ms Eveline Heynen)
    Author:Reid, JB (Professor Jim Reid)
    ID Code:106631
    Year Published:2016 (online first 2015)
    Funding Support:Australian Research Council (DP140101709)
    Web of Science® Times Cited:2
    Deposited By:Plant Science
    Deposited On:2016-02-16
    Last Modified:2017-11-02
    Downloads:0

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