10 エドヒガン系サクラ当年枝の成長方向に関わるGA3とブラシノライドの相互作用

概要

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It has been reported that GA_3 prevented the branch bending of weeping type and the higher concentration of brassinolide (BL) induced the branch bending of upright type in Prunus spachiana. In the present study, the interaction of GA_3 and BL on the regulation of growth direction of branches were investigated using current-year branches of upright type of Prunus spachiana. The branches of upright type became to grow downward with BL and they recovered their upward growth with BL+GA_3. In the basal internodes of BL+GA_3-treated branches, the width of branch and xylem were wider and the density of vessels were sparser than in those of BL-treated branches. Especially, such effects were remarkably recognized in the upper side of BL+GA3-treated branches. From these results, BL inhibited the development of xylem as the supporting tissue, and GA_3 promoted the secondary thickening growth. In conclusion, it was suggested that GA_3 and BL antagonized on the regulation of growth direction of branches, responding to gravistimulus in the branches of upright type of Prunus spachiana.
植物化学調節学会の論文
1999-10-01