Abstract:

Gibberellin 2-oxidases（GA2oxs）are a kind of key enzymes in the metabolism of GA. According to the substrate specificity，GA2oxs can be divided into two types：C19-GA2oxs and C20-GA2oxs，in which C20-GA2oxs acts on GA synthesis precursors（GA12，GA53），and C19-GA2oxs is responsible for metabolizing active GA（GA1，GA4）and precursors（GA20，GA9）. GA2oxs are encoded by multiple genes，involved in regulating plant growth and development and strictly regulated by environment and endogenous factors. Studies have shown that GA2oxs affect the growth and development of plants，for example，plant height，seed germination，flowering and fruiting by regulating the gibberellin level. Here，we summarized the research progress in the expression patterns，physiological functions and transcriptional regulation of GA2oxs，aiming to provide reference for understanding the regulatory mechanisms of GA2oxs genes on plant growth and development. It is also helpful to make better use of GA2oxs genes in genetic engineering research for crop improvement.

Key words: GA2oxs, expression pattern, physiological function, environmental factor, plant hormone, transcription factor