Abstract

Flower bud physiological differentiation is the key transition from vegetative growth to reproductive growth, which includes physiological and biochemical changes, transcriptional regulation, epigenetic modification, protein modification and signal transduction. The flower formation of citrus refers to the process of its axillary buds gradually transforming into flower buds. To understand this process deeply is of great significance for mastering the phenological law of citrus, accurately regulating its flowering time, off-season cultivation and breeding of new varieties. In this paper, the physiological differentiation process of citrus flower bud was systematically reviewed, and the regulation effects of internal and external factors on this process were discussed, as well as the recent progress of related genes involved in regulation. In addition, the regulation map of citrus flower formation pathway is also drawn to show the complex regulatory network in an intuitive form. Finally, the future trend and direction of citrus flower bud differentiation research were prospected in order to provide reference for related research.