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The Arabidopsis homeotic genes APETALA3 and PISTILLATA are sufficient to provide the B class organ identity function

Krizek, Beth Allyn and Meyerowitz, Elliot M. (1996) The Arabidopsis homeotic genes APETALA3 and PISTILLATA are sufficient to provide the B class organ identity function. Development, 122 (1). pp. 11-22. ISSN 0950-1991.

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The class B organ identity genes, APETALA3 and PISTILLATA, are required to specify petal and stamen identity in the Arabidopsis flower. We show here that the activities of these two genes are sufficient to specify petals and stamens in flowers, in combination with the class A and C genes, respectively. Flowers of plants constitutively expressing both PISTILLATA and APETALA3 under the control of the 35S promoter from cauliflower mosaic virus consist of two outer whorls of petals and inner whorls of stamens. These plants also exhibit vegetative phenotypes that are not present in either of the singly (APETALA3 or PISTILLATA) overexpressing lines. These phenotypes include leaf curling and the partial conversion of later-arising cauline leaves to petals. The presence of additional floral whorls in flowers ectopically expressing APETALA3 and PISTILLATA and the rescue of missing organs in class A mutants by ectopic B function suggest that APETALA3 and PISTILLATA play an additional role in proliferation of the floral meristem.

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Additional Information:Copyright © 1996 by Company of Biologists. (Accepted 21 September 1995) We thank Justin Goodrich, George Coupland and Detlef Weigel for allowing us to mention their unpublished results, Esther Koh for help with the plant transformations, Tom Jack, Justin Goodrich, Bobby Williams, Mark Running, Jian Hua, Hajime Sakai, José Luis Riechmann, Xuemei Chen, Joshua Levin, Zhongchi Liu and Steve Jacobsen for comments on the manuscript, and Pat Koen for advice on the use of the SEM. B.A.K. was supported by ACS postdoctoral fellowship PF-3911. This work was supported by US National Science Foundation grant MCB-9204839 to E.M.M.
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American Cancer SocietyPF-3911
National Science FoundationMCB-9204839
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Deposited On:16 Oct 2008 20:20
Last Modified:03 Dec 2014 21:22

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