Effects of Different Growth Regulators Treatment on Cattleya Flowering

The effects of different growth regulators (GA3,NAA, and ABA) on Cattleya flowering date and flower quality were studied by injecting different concentrations of growth regulators into flower sheathes.The results showed that injecting 60 mg·kg-1 or 120 mg·kg-1 GA3 of resulted in earlier flowering date (13.34 days and 22.34 days, respectively), as well as significantly increased the lengthes of flower sepal, petal, pedicel and scape, in comparison with controls injected with deionised water. Injecting 10 mg·kg-1 NAA also significantly increased flower size. In contrast, injecting ABA had no influence on flowering date. Moreover, when injecting high concentration of ABA (40 mg·kg-1),both the flowering rate and flower size were decreased. Overall, injecting 60 mg·kg-1 GA3 or 10 mg·kg-1 NAA, which not only advanced flowering date, but also enlarged flower size and maintained high flowering rate, could serve as a valuable way to regulate the date of floresence.