Louie D S, Addicott F T
Department of Botany, University of California, Los Angeles, California 90024.
Plant Physiol. 1970 Jun;45(6):654-7. doi: 10.1104/pp.45.6.654.
The influence of applied auxin on abscission in explants (excised cotyledonary nodes) of cotton was investigated.Proximal applications to the stem stump accelerated abscission with all concentrations applied. Distal applications to the petiole stumps retarded abscission with all concentrations applied.Simultaneous applications to petiole and stem stumps accelerated, retarded, or were without effect on abscission depending on the relative amounts applied. Relatively high concentrations proximal on stem stumps accelerated abscission whereas relatively high concentrations distal on petiole stumps retarded abscission. The abscission rates from various combinations resulted in a multiphasic abscission response curve as the amounts applied were increased.Consideration of these and related data in the literature indicates that many factors can have profound effects on the nature of abscission responses to auxin.
研究了外源生长素对棉花外植体（切除的子叶节）脱落的影响。对茎残端进行近端处理时，所有施用浓度均加速了脱落。对叶柄残端进行远端处理时，所有施用浓度均延缓了脱落。根据施用的相对量，同时对叶柄和茎残端进行处理时，对脱落的影响可能是加速、延缓或无影响。茎残端近端施用相对高浓度的生长素会加速脱落，而叶柄残端远端施用相对高浓度的生长素会延缓脱落。随着施用量增加，各种组合的脱落率产生了多相脱落反应曲线。对这些以及文献中相关数据的考量表明，许多因素可能会对生长素脱落反应的性质产生深远影响。
