Abstract
The diploid wheat mutant, maintained vegetative phase (mvp), was induced by nitrogen ion-beam treatment, and was identified as an deletion mutant of VRN1 gene, wheat AP1/FUL-like gene that functions in leaves and activates flowering. The mvp mutant never transit from the vegetative to reproductive phase. No expression of FT was observed in the mvp mutant, although the mutant contains an intact FT gene. These results indicate that VRN1 is upstream of FT and associated with FT expression. In the normal wheat line, VRN1 is expressed under short-day conditions but the FT expression is not detected. On the other hand, our expression analysis suggested that two CO-like genes play distinctive roles in wheat leaves. Here, a flowering gene network model in which VRN1 up-regulates the FT expression together with CO-like gene.
