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

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

SUBMITTER: Dubcovsky J 

PROVIDER: S-EPMC4739792 | biostudies-literature | 2006 Mar

REPOSITORIES: biostudies-literature