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Published April 9, 2013 | Accepted Version + Supplemental Material
Journal Article Open

LEAFY Controls Auxin Response Pathways in Floral Primordium Formation

Abstract

The transcription factor LEAFY is a master regulator of flowering and of flower development. It acts as a component of a switch that mediates the transition from the vegetative to the reproductive phase of plant development. Auxin is a plant hormone with many different roles in plant growth, including the induction of new primordia of both leaves and flowers at the shoot apex. We report that LEAFY acts in part by controlling the auxin response pathway in new primordia. Therefore, regulation of flower development by transcriptional master regulators and hormonal control of morphogenesis appear to be interacting processes. We found that hormone perception not only controls but is also controlled by the transcriptional signals that create plant form.

Additional Information

© 2013 American Association for the Advancement of Science. Submitted 3 January 2013; Accepted 15 March 2013; Final Publication 9 April 2013. We thank the members of the Meyerowitz laboratory for comments and discussion. We thank A. Roeder for technical assistance with mapping, Z. Nimchuk for technical assistance with construct preparation, V. Chickarmane for assistance in statistical analysis, M. Heisler for technical assistance with imaging, and A. Garda for plant care. We thank Y. Watanabe for the pTA7002 binary vector and The Arabidopsis Information Resource (TAIR) for essential genome information. Funding: Work at the California Institute of Technology was supported by the Department of Energy Office of Basic Energy Sciences, Division of Chemical Sciences, Geosciences, and Biosciences grant DE-FG02-88ER13873 (E.M.M.). Work at the University of Minnesota was supported by the NSF (grants MCB-0725149, IOS-PGRP-0923960, IOS-PGRP-1238812, and MCB-1203438), the Minnesota Agricultural Experiment Station, and the Gordon and Margaret Bailey Endowment for Environmental Horticulture. Author contributions: W.L. and E.M.M. conceived the project; W.L., Y.Z., X.L., and P.Y. performed the experiments; and W.L. and E.M.M. wrote the manuscript. X.L. and J.D.C. developed the method for auxin analysis, and J.D.C. reviewed the mass spectral data and interpreted the analytical results. Competing interests: The authors declare that they have no competing interests. Data and materials availability: Requests for materials should be addressed to E.M.M.

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August 19, 2023
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