Review of Mechanism of Rice Flowering in Response to Photoperiod Research Progress on Florigen in Plants Identification of PEBP Gene Family in Gossypium arboreum and Gossypium raimondii and Expression Analysis of the Gene family in Gossypium hirsutum Cloning and Expression Analysis of GbMFT1 Gene in Gossypium barbadense L. Molecular Control of Flowering in Response to Day Length in Rice Molecular cloning and functional analysis of the FLOWERING LOCUS T (FT) homolog GhFT1 from Gossypium hirsutum Florigen: One Found, More to Follow?