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Phenotypic plasticity of adventitious rooting in Arabidopsis is controlled by complex regulation of Auxin response factor transcripts and microRNA abundance
Umeå Plant Science Centre, Department of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences, SE-90183 Umeå, Sweden. (Centre de Ressources Régionales en Biologie Moléculaire, Université de Picardie Jules Verne, 80039 Amiens, France)
Umeå Plant Science Centre, Department of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences, SE-90183 Umeå, Sweden. (Australian Research Council Centre of Excellence in Plant Energy Biology, University of Western Australia, Crawley WA 6009, Australia)
Umeå Plant Science Centre, Department of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences, SE-90183 Umeå, Sweden. (University of Agricultural Sciences and Veterinary Medicine, 400372 Cluj Napoca, Romania)
Umeå Plant Science Centre, Department of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences, SE-90183 Umeå, Sweden.
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2009 (English)In: The Plant Cell, ISSN 1040-4651, E-ISSN 1532-298X, Vol. 21, no 10, 3119-3132 p.Article in journal (Refereed) Published
Abstract [en]

The development of shoot-borne roots, or adventitious roots, is indispensable for mass propagation of elite genotypes. It is a complex genetic trait with a high phenotypic plasticity due to multiple endogenous and environmental regulatory factors. We demonstrate here that a subtle balance of activator and repressor AUXIN RESPONSE FACTOR (ARF) transcripts controls adventitious root initiation. Moreover, microRNA activity appears to be required for fine-tuning of this process. Thus, ARF17, a target of miR160, is a negative regulator, and ARF6 and ARF8, targets of miR167, are positive regulators of adventitious rooting. The three ARFs display overlapping expression domains, interact genetically, and regulate each other's expression at both transcriptional and posttranscriptional levels by modulating miR160 and miR167 availability. This complex regulatory network includes an unexpected feedback regulation of microRNA homeostasis by direct and nondirect target transcription factors. These results provide evidence of microRNA control of phenotypic variability and are a significant step forward in understanding the molecular mechanisms regulating adventitious rooting.

Place, publisher, year, edition, pages
2009. Vol. 21, no 10, 3119-3132 p.
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Biological Sciences
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URN: urn:nbn:se:umu:diva-30741DOI: 10.1105/tpc.108.064758PubMedID: 19820192OAI: oai:DiVA.org:umu-30741DiVA: diva2:286443
Available from: 2010-01-14 Created: 2010-01-14 Last updated: 2017-12-12Bibliographically approved

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Pacurar, Daniel IPacurar, MonicaBellini, Catherine
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