Common and divergent roles of plant hormones in nodulation and arbuscular mycorrhizal symbioses

Plant Signaling & Behavior
Eloise FooJames B Reid

Abstract

All of the classical plant hormones have been suggested to influence nodulation, including some that interact with the Autoregulation of Nodulation (AON) pathway. Leguminous plants strictly regulate the number of nodules formed through this AON pathway via a root-shoot-root loop that acts to suppress excessive nodulation. A related pathway, the Autoregulation of Mycorrhization (AOM) pathway controls the more ancient, arbuscular mycorrhizal (AM) symbiosis. A comparison of the published responses to the classical hormones in these 2 symbioses shows that most influence the symbioses in the same direction. This may be expected if they affect the symbioses via common components of these symbiotic regulatory pathways. However, some hormones influence these symbioses in opposite directions, suggesting a more complex relationship, and probably one that is not via the common components of these pathways. In a recent paper we showed, using a genetic approach, that strigolactones and brassinosteroids do not act downstream of the AON genes examined and argued that they probably act independently to promote nodule formation. Recently it has been shown that the control of nodulation via the AON pathway involves mobile CLE peptide signals. It...Continue Reading

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Citations

Jun 7, 2015·Annual Review of Phytopathology·Erik LimpensRene Geurts
Sep 18, 2015·Molecular Plant Pathology·Sara N BlakeEloise Foo
Dec 15, 2015·The New Phytologist·Eloise FooJames B Reid
Jul 26, 2018·Frontiers in Plant Science·Chenglei WangEloise Foo
Mar 30, 2020·Science China. Life Sciences·Chen ZhangZhaosheng Kong
May 4, 2016·The American Journal of the Medical Sciences·Ning CuiGuang Yu

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