The effect of sucrose on the expression of the VvTFL1 and VFL genes during flower development in the “Xiangfei” grapevine

► VvTFL1 gene and VFL gene expression after sucrose treatment. ► VvTFL1 gene might be mainly involved in the apical growth process of shoots. ► Exogenous sucrose effect on VvTFL1 gene expression at the shoot apical meristem initiation. ► VFL gene is important in the inflorescence meristems initiation and flower organs differentiation. ► Exogenous sucrose effect on VFL gene expression at the flower early development.