Department of Vegetable Crops, University of California, Riverside.
CHANGES IN ABSCISSION-ACCELERATING SUBSTANCES WITH DEVELOPMENT OF COTTON FRUIT
Article first published online: 2 MAY 2006
Volume 68, Issue 2, pages 313–322, April 1969
How to Cite
SMITH, O. E. (1969), CHANGES IN ABSCISSION-ACCELERATING SUBSTANCES WITH DEVELOPMENT OF COTTON FRUIT. New Phytologist, 68: 313–322. doi: 10.1111/j.1469-8137.1969.tb06443.x
- Issue published online: 2 MAY 2006
- Article first published online: 2 MAY 2006
- (Received 16 September 1968)
Cotton bolls of known ages from 2 to 50 days after anthesis were extracted with acetone. The chromatographed extracts were examined for abscission activity on the cotton explant test and gibberellin activity on the dwarf maize test. The abscission-accelerating substances (ABA and gibberellins) were very high in young fruit, showing a peak at about 6 days, then declined to nil at 20 days. An unidentified abscission accelerator showed a marked peak at 15 days. Abscisic acid, GA3, another gibberellin which acts biologically like GA5 and GA9, and an abscission-retarding substance were all extracted from 5-day-old bolls.