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Strigolactones: new physiological roles for an ancient signal
journal contribution
posted on 2023-05-17, 14:27 authored by Eloise FooEloise Foo, James ReidJames ReidStrigolactones are an ancient group of plant signalling molecules. They play a critical role in the rhizosphere where they facilitate the formation of symbioses with fungi, crucial for the acquisition of plant nutrients in over 80 % of land plant species. Strigolactones have also been exploited by parasitic weeds as a rhizosphere signal indicating the presence of a host species, resulting in devastating losses in some agricultural systems. Recently, they have also been shown to act endogenously as plant hormones controlling shoot branching and have been implicated in a wide range of other physiological processes, including root growth, root-hair elongation, adventitious rooting, secondary growth, photomorphogenesis, seed germination, nodulation, and protonemal development in mosses. Here, we discuss the evidence for the involvement of strigolactones as endogenous regulators of these processes and highlight some examples where the evidence is inconclusive. One major gap in our understanding is the identity of the endogenous strigolactone( s) that are biologically active. A discussion of the interactions between the different plant hormones and the possible role of strigolactones as integrators of the root-toshoot balance, nutrient acquisition, and thus resource allocation illustrates some important future directions for this area of research.
Funding
Australian Research Council
History
Publication title
Journal of Plant Growth RegulationVolume
32Pagination
429-442ISSN
0721-7595Department/School
School of Natural SciencesPublisher
Springer New York LLCPlace of publication
233 Spring St, New York, NY 10013 United StatesRights statement
Copyright Springer Science+Business MediaRepository Status
- Restricted