Abstract
The flowering is induced under short day (SD) condition in chrysanthemums. There are varieties of critical daylength for flowering in chrysanthemums. FT and Hd3a proteins are proposed as a floral hormone, florigen. Under the inductive condition for flowering, AP1 and LFY expressions are up-regulated in apical meristem. We investigated flowering related genes expression in two line of the wild chrysanthemum (Chrysanthemum seticuspe f. boreale line NIFS-3 and line Matsukawa-1) which have different critical daylength for flowering. Here we isolated homologes of FT/Hd3a, AP1 and LFY in Chrysanthemum. One of the FT-like gene, CsFTL3, was induced depending on the shorting of day length in two lines. The expression levels of AP1 and LFY homologues genes, CsAFL1, CsM111 and CsFL, in shoot tips were differently up-regulated under SD condition in two lines. From these results, we will discuss the critical day length and photoperiodic flower induction in chrysanthemum.
