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Originally published as Genetics Published Articles Ahead of Print on October 16, 2004.
Genetics, Vol. 169, 907-915, February 2005, Copyright © 2005
doi:10.1534/genetics.104.033357
Photoperiod Regulates Flower Meristem Development in Arabidopsis thaliana
Sangho Jeong1 and Steven E. Clark2
Department of Molecular, Cellular and Developmental Biology, University of Michigan, Ann Arbor, Michigan 48109-1048
2 Corresponding author: Department of Molecular, Cellular and Developmental Biology, Kraus Natural Science Bldg., University of Michigan, Ann Arbor, MI 48109-1048.
E-mail: clarks{at}umich.edu
Photoperiod has been known to regulate flowering time in many plant species. In Arabidopsis, genes in the long day (LD) pathway detect photoperiod and promote flowering under LD. It was previously reported that clavata2 (clv2) mutants grown under short day (SD) conditions showed suppression of the flower meristem defects, namely the accumulation of stem cells and the resulting production of extra floral organs. Detailed analysis of this phenomenon presented here demonstrates that the suppression is a true photoperiodic response mediated by the inactivation of the LD pathway under SD. Inactivation of the LD pathway was sufficient to suppress the clv2 defects under LD, and activation of the LD pathway under SD conditions restored clv2 phenotypes. These results reveal a novel role of photoperiod in flower meristem development in Arabidopsis. Flower meristem defects of clv1 and clv3 mutants are also suppressed under SD, and 35S:CO enhanced the defects of clv3, indicating that the LD pathway works independently from the CLV genes. A model is proposed to explain the interactions between photoperiod and the CLV genes.
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