Abstract:

The contents of GA₁₊₃ and ABA in male flower buds of Ginkgo biloba decreased at the physiological differentiation stage, meanwhile the contents of ZRs and iPAs, the ratio of ZRs to GA₁₊₃ ,the ratio of iPAs to GA₁₊₃ ,the ratio of ZRs to ABA,and the ratio of iPAs to ABA were higher than those in leaf buds and reached a peak. At morphological differentiation stage, the contents of ZRs and iPAs, the ratio of ZRs to GA₁₊₃ , the ratio of iPAs to GA₁₊₃ ,the ratio of ZRs to ABA,and the ratio of iPAs to ABA were low, but ABA content and the ratio of ABA to GA₁₊₃ were higher than those in leaf buds. The contents of K and total carbohydrate in leaves of male spurs were higher than those in leaves of shoots during the whole period, on the contrary, the content of N was lower than that of leaves of shoots. The content of P in leaves of spurs was higher than that in leaves of shoots at physiological differentiation stage.

Key words: Ginkgo biloba, Male flower bud, Differentiation, Endogenous hormones, Carbohydrate, Mineral nutrition