The regulation mechanism of the fall dormancy in alfalfa

Fall dormancy is a kind of growth characteristics of alfalfa as a special dormancy way to response the environmental changes, and it is not only related to day length and photoperiod, but is related to circadian clock, light, temperature and the relevant genes. The latest studies have indicated that the dormancy phenomenon has been affected by a variety of plant hormones,phytochrome and genes regulation. The hormones and phytochrome of alfalfa plays an important role in the regulation of fall dormancy. The relationship between the fall dormancy, the photoperiod and hormones, phytochrome were reviewed, and the dormancy regulation mechanism was discussed in this paper.