Department of Horticulture, Michigan State University, East Lansing, Michigan 48824.
Plant Physiol. 1974 Oct;54(4):494-8. doi: 10.1104/pp.54.4.494.
Initiation of abscission at the pedicel-fruit zone in the sour cherry (Prunus cerasus L. cv. Montmorency) occurs near the transition of Stage II to Stage III of fruit growth. The preinitiation phase is characterized by a high fruit removal force (FRF) and explants prepared from fruits during this period do not undergo abscission as indexed by a reduction in FRF. Ethylene does not cause a significant reduction in FRF either in attached fruit or in explants prepared during this period. By contrast, after initiation (Stage III of fruit growth), there is a marked decrease in FRF with fruit development, explants prepared from fruits during this period undergo abscission, and ethylene markedly promotes the loss in break-strength. Neither the rate of evolution nor the internal concentration of ethylene in the fruit were correlated with fruit abscission. Similar abscission responses, as indexed by FRF and sensitivity to ethylene, were observed in attached fruit and in detached fruit explants.
在酸樱桃（Prunus cerasus L. cv. Montmorency）的果柄-果实区域，离果实生长的第二阶段向第三阶段过渡不远的地方，离层就开始形成。在起始前期，果实的脱落力（FRF）很高，并且在这个时期准备的外植体不会脱落，脱落力（FRF）降低。乙烯在附着的果实或在此期间准备的外植体中都不会显著降低 FRF。相比之下，起始后（果实生长的第三阶段），随着果实的发育，FRF 会显著降低，在此期间准备的外植体脱落，而乙烯则显著促进了断裂强度的丧失。果实中乙烯的演化率和内部浓度都与果实脱落无关。在附着的果实和离体果实外植体中，都观察到了类似的脱落反应，其指标是 FRF 和对乙烯的敏感性。
