Abstract
Strigolactones 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-to-shoot balance, nutrient acquisition, and thus resource allocation illustrates some important future directions for this area of research.
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The authors thank Shelley Urquhart for unpublished results, John Ross and Brett Ferguson for helpful comments on the manuscript, Laura Quittenden for technical assistance, and the Australian Research Council and the University of Tasmania for financial support.
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Foo, E., Reid, J.B. Strigolactones: New Physiological Roles for an Ancient Signal. J Plant Growth Regul 32, 429–442 (2013). https://doi.org/10.1007/s00344-012-9304-6
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DOI: https://doi.org/10.1007/s00344-012-9304-6