Effect of photoperiod on the regulation of wheat vernalization genes VRN1 and VRN2

Plant Molecular Biology
J DubcovskyLiuling Yan

Abstract

Wheat is usually classified as a long day (LD) plant because most varieties flower earlier when exposed to longer days. In addition to LD, winter wheats require a long exposure to low temperatures (vernalization) to become competent for flowering. Here we show that in some genotypes this vernalization requirement can be replaced by interrupting the LD treatment by 6 weeks of short day (SD), and that this replacement is associated with the SD down-regulation of the VRN2 flowering repressor. In addition, we found that SD down-regulation of VRN2 at room temperature is not followed by the up-regulation of the meristem identity gene VRN1 until plants are transferred to LD. This result contrasts with the VRN1 up-regulation observed after the VRN2 down-regulation by vernalization, suggesting the existence of a second VRN1 repressor. Analysis of natural VRN1 mutants indicated that a CArG-box located in the VRN1 promoter is the most likely regulatory site for the interaction with this second repressor. Up-regulation of VRN1 under SD in accessions carrying mutations in the CArG-box resulted in an earlier initiation of spike development, compared to other genotypes. However, even the genotypes with CArG box mutations required LD for a nor...Continue Reading

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Citations

Aug 24, 2007·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·James CockramDonal M O'sullivan
Jan 9, 2009·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·Yihua ChenLiuling Yan
Feb 24, 2009·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·Shuwen WangLiuling Yan
Mar 12, 2009·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·Andrew ChenNicholas C Collins
Jun 6, 2013·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·Adrian S TurnerDavid A Laurie
Nov 24, 2006·Molecular Genetics and Genomics : MGG·Daolin FuJorge Dubcovsky
Nov 15, 2011·Molecular Genetics and Genomics : MGG·Torben AspThomas Lübberstedt
Mar 5, 2008·Plant Molecular Biology·Andrea K KnoxJorge Dubcovsky
Oct 24, 2007·Transgenic Research·Daolin FuJorge Dubcovsky
Aug 18, 2012·Nature Reviews. Genetics·Fernando Andrés, George Coupland
Mar 25, 2008·Plant Physiology·Megan N HemmingBen Trevaskis
Nov 14, 2008·Plant Physiology·Assaf DistelfeldJorge Dubcovsky
Jun 24, 2010·Plant Physiology·Taniya DhillonJorge Dubcovsky
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