Sugano Mami, Kaneyasu Satoko, Nakamura Teruko
Graduate School of Science, Japan Women's University.
Biol Sci Space. 2003 Oct;17(3):245-6.
It has been reported that Japanese flowering cherry promotes the formation of tension wood in the upper side of the inclined stem, which induces the negative gravitropism. In the other hand, the plant under simulated micro-gravity conditions reduces the width of the secondary xylem and increases the density of the vessels, which means decreased the density of the fiber cells. The plant under simulated micro-gravity conditions showed that the inhibition of xylem development and the decreased supporting mechanism in the stem. In this study we examined that the effects of auxin and gibberellin in the plant under simulated micro-gravity conditions and inclined stimulus. The gibberellin treatment promotes the secondary xylem development under simulated microgravity conditions and inclined stimulus. The upper side of the inclined stem contents much higher levels of IAA and gibberellin A1(GA1) than the lower side of that.
据报道，日本樱花促进倾斜茎上部张力木的形成，从而诱导负向重力性。另一方面，处于模拟微重力条件下的植物会减小次生木质部的宽度并增加导管密度，这意味着纤维细胞密度降低。处于模拟微重力条件下的植物表现出木质部发育受到抑制以及茎中支撑机制减弱。在本研究中，我们研究了生长素和赤霉素在模拟微重力条件和倾斜刺激下对植物的影响。赤霉素处理在模拟微重力条件和倾斜刺激下促进次生木质部发育。倾斜茎的上部比其下部含有更高水平的吲哚乙酸（IAA）和赤霉素A1（GA1）。
