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Regulation of SUP Expression Identifies Multiple Regulators Involved in Arabidopsis Floral Meristem Development

Sakai, Hajime and Krizek, Beth A. and Jacobsen, Steven E. and Meyerowitz, Elliot M. (2000) Regulation of SUP Expression Identifies Multiple Regulators Involved in Arabidopsis Floral Meristem Development. Plant Cell, 12 (9). pp. 1607-1618. ISSN 1040-4651. PMCID PMC149073. doi:10.1105/tpc.12.9.1607.

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During the course of flower development, floral homeotic genes are expressed in defined concentric regions of floral meristems called whorls. The SUPERMAN (SUP, also called FLO10) gene, which encodes a C2H2-type zinc finger protein, is involved in maintenance of the stamen/carpel whorl boundary (the boundary between whorl 3 and whorl 4) in Arabidopsis. Here, we show that the regulation of SUP expression in floral meristems is complex, consisting of two distinct phases, initiation and maintenance. The floral meristem identity gene LEAFY (LFY) plays a role in the initiation phase through at least two pathways, which differ from each other in the involvement of two homeotic genes, APETALA3 (AP3) and PISTILLATA (PI). AP3, PI, and another homeotic gene, AGAMOUS (AG), are further required for SUP expression in the later maintenance phase. Aside from these genes, there are other as yet unidentified genes that control both the temporal and spatial patterns of SUP expression in whorl 3 floral meristems. SUP appears to act transiently, probably functioning to trigger a genetic circuit that creates the correct position of the whorl 3/whorl 4 boundary.

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Meyerowitz, Elliot M.0000-0003-4798-5153
Additional Information:© 2000 American Society of Plant Biologists. Received March 10, 2000. Accepted July 24, 2000. Published September 1, 2000. We thank Catherine Baker, Chiou-Fen Chung, Toshiro Ito, Carolyn Ohno, Doris Wagner, and Eva Ziegelhofer for comments on the manuscript and Pat Koen for assistance with the scanning electron microscope. This work was supported by National Science Foundation Grant No. MCB-9603821 to E.M.M.
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Issue or Number:9
PubMed Central ID:PMC149073
Record Number:CaltechAUTHORS:20161212-120947796
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:72727
Deposited By: George Porter
Deposited On:12 Dec 2016 22:03
Last Modified:11 Nov 2021 05:05

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