Department of Plant Sciences, Texas Agricultural Experiment Station, Texas A&M University, College Station, Texas 77843.
Plant Physiol. 1977 Apr;59(4):710-2. doi: 10.1104/pp.59.4.710.
The three abscission-inducing agents - water stress, Ethephon, and auxin transport inhibitors-acted synergistically to promote leaf fall in cotton (Gossypium hirsutum L.). However, the synergism was primarily between stress and Ethephon. Auxin transport inhibitors did not promote the effect of stress alone, only promoted the effect of Ethephon in well watered plants and gave a very small promotion with stress and Ethephon together. Abscission was rapid in stressed plants treated with Ethephon and an auxin transport inhibitor, while leaves fell more slowly from well watered plants treated with Ethephon alone. This suggests that water stress or auxin transport inhibitors influence initial events in abscission; since an auxin transport inhibitor will replace the effect of stress but not Ethephon, an initial event in stress-induced abscission appears to be inhibition of auxin transport. Ethephon promoted lateral bud release, and auxin transport inhibitors did not duplicate that effect alone or promote it in combination with Ethephon.
三种离层诱导剂 - 水分胁迫、乙烯利和生长素运输抑制剂 - 协同作用促进棉花（Gossypium hirsutum L.）落叶。然而，协同作用主要发生在胁迫和乙烯利之间。生长素运输抑制剂不能单独促进胁迫的作用，仅在水分充足的植物中促进乙烯利的作用，并且与胁迫和乙烯利一起作用时促进作用很小。在受乙烯利和生长素运输抑制剂处理的胁迫植物中，离层迅速发生，而单独用乙烯利处理的水分充足的植物中，叶片脱落较慢。这表明水分胁迫或生长素运输抑制剂影响离层的初始事件；由于生长素运输抑制剂可以替代胁迫的作用而不是乙烯利的作用，因此胁迫诱导离层的初始事件似乎是生长素运输的抑制。乙烯利促进侧芽释放，生长素运输抑制剂单独或与乙烯利联合使用均不能重复该作用。
