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Plant Physiology 82:991-994 (1986)
© 1986 American Society of Plant Biologists

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Articles

Abscission of Mango Fruitlets as Influenced by Enhanced Ethylene Biosynthesis 1

Roberto Nunez-Elisea2 and Thomas L. Davenport

University of Florida, Institute of Food and Agricultural Sciences, Tropical Research and Education Center, Homestead, Florida 33031

Experiments were conducted on developing fruitlet explants of two mango (Mangifera indica L.) cultivars to establish the source and dynamics of ethylene production prior to and during fruitlet abscission. Abscission of all fruits in the samples occurred at approximately 86 and 74 hours postharvest in `Keitt' and `Tommy Atkins,' respectively. Increased abscission began 26 hours from harvest and was preceded by enhanced ethylene synthesis. Enhanced ethylene production initiated approximately 48 hours prior to abscission and increased to a maximum near the time of fruitlet abscission. The seed produced the highest amount of ethylene on a per gram fresh weight basis. The pericarp, however, was the main source of ethylene on an absolute basis, since it represented more than 85% of total fruitlet weight. Pedicels containing the abscission zone produced no detectable ethylene prior to or at the moment of abscission. Fumigation of `Tommy Atkins' fruitlets with 1, 15, or 100 microliters per liter ethylene accelerated abscission by 24 to 36 hours in comparison with unfumigated controls. Diffusion of ethylene from distal fruitlet tissues to the abscission zone triggers the events leading to separation of the fruit from the tree.

2 From a thesis submitted in partial fulfillment of the requirements for the MS degree in Fruit Crops at the University of Florida, Gainesville. Present address: INIFAP, Campo Agricola Experimental Tecoman, Apartado Postal 88, 28100 Tecoman, Colima, Mexico.

1 Financial support from the Mexican government agencies CONACYT and INIA is gratefully acknowledged. Florida Agricultural Experiment Stations Journal Series No. 7088.






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Copyright © 1986 by the American Society of Plant Biologists