Prasad T K, Cline M G
Department of Botany, Ohio State University, Columbus 43210, USA.
Plant Physiol. 1987;83(3):505-9. doi: 10.1104/pp.83.3.505.
Shoot inversion-induced release of apical dominance in Pharbitis nil is inhibited by rotating the plant at 0.42 revolutions per minute in a vertical plane perpendicular to the axis of rotation of a horizontal clinostat. Clinostating prevented lateral bud outgrowth, apparently by negating the restriction of the shoot elongation via reduction of ethylene production in the inverted shoot. Radial stem expansion was also decreased. Data from experiments with intact tissue and isolated segments indicated that shoot-inversion stimulates ethylene production by increasing the activity of 1-aminocyclopropane-1-carboxylic acid synthase. The results support the hypothesis that shoot inversion-induced release of apical dominance in Pharbitis nil is due to gravity stress and is mediated by ethylene-induced retardation of the elongation of the inverted shoot.
在垂直于水平回转器旋转轴的垂直平面内，以每分钟0.42转的速度旋转植物，可抑制牵牛茎倒置诱导的顶端优势释放。回转处理阻止了侧芽生长，显然是通过减少倒置茎中乙烯的产生来消除对茎伸长的限制。茎的径向扩展也减少了。完整组织和分离切段的实验数据表明，茎倒置通过增加1-氨基环丙烷-1-羧酸合酶的活性来刺激乙烯的产生。这些结果支持了这样的假设，即牵牛茎倒置诱导的顶端优势释放是由于重力胁迫，并由乙烯诱导的倒置茎伸长受阻介导。
