Studies On The Differentiation Course And The Fluctuations Of Endogenous Phytohormones Of Flower Buds In Appl

Thc wcr bud physiological differentiation period was studied with Re Rodchief, Golden Delicious and Jonathan apple varieties by defr j, Jc~oliating and spraying GA3 at different times. Results showe. riysiological changing process started after the cease of branch 憕:th continucd to the beginning of morphological differer or, such period is the critical period for flower bud Initiation, it is an ?mtivcs period hr flower bud formation. Ob? 搼i 3v0r 3 yr~vs on the process of the Increase of the node numbe I ower and oaf bud and flower bud morphological differeri revealed that the process of node increase was an asymp -~ rye? From the beginning of flower bud morphological differei~ a ~r th~ node ni,iiber of the leaf bud will no longer increase, while t 憁ber of llower bud still continued to grow, so that at lastwh 搼n 慽uinhorw si to3morethanthatof leaf bud.Thenode numbe ~ 0 er bud mainy proceeded in the early stage. There was an exceptir Jonathan variety, whose flower and leaf bud node incres n~ded at the same time after the beginning of morp ~?a fero:itia~on. As to the effects of spraying B, or GA3, it was i?y~ ccjjcl crease the leaf bud node number , but no effect