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The Wheat VRN2 Gene Is a Flowering Repressor Down-Regulated by Vernalization
Liuling Yan,1*
Artem Loukoianov,1
Ann Blechl,2
Gabriela Tranquilli,1
Wusirika Ramakrishna,3
Phillip SanMiguel,4
Jeffrey L. Bennetzen,5
Viviana Echenique,1
Jorge Dubcovsky1*
Abstract:
Plants with a winter growth habit flower earlier when exposedfor several weeks to cold temperatures, a process called vernalization.We report here the positional cloning of the wheat vernalizationgene VRN2, a dominant repressor of flowering that is down-regulatedby vernalization. Loss of function of VRN2, whether by naturalmutations or deletions, resulted in spring lines, which do notrequire vernalization to flower. Reduction of the RNA levelof VRN2 by RNA interference accelerated the flowering time oftransgenic winter-wheat plants by more than a month.
1 Department of Agronomy and Range Science, University of California, Davis, CA 95616, USA. 2 U.S. Department of AgricultureAgricultural Research Service, Albany, CA 94710, USA. 3 Department of Biological Sciences, Michigan Technological University, Houghton, MI 49931, USA. 4 Purdue University Genomics Core, Purdue University, West Lafayette, IN 47907, USA. 5 Department of Genetics, University of Georgia, Athens, GA 30602, USA.
Present address: Instituto Recursos Biológicos, InstitutoNacional de Tecnologia Agropecuaria, (1712) Castelar, BuenosAires, Argentina.
Present address: Consejo Nacional Investigaciones Cientificasy Tecnicas Departamento de Agronomía, Universidad Nacionaldel Sur, 8000 Bahía Blanca, Argentina.
To whom correspondence should be addressed. E-mail: jdubcovsky{at}ucdavis.edu
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