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Abscission in Cotton Flowers

Charles P. Dutt
Botanical Gazette
Vol. 85, No. 2 (Apr., 1928), pp. 208-220
Stable URL: http://www.jstor.org/stable/2470933
Page Count: 13
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Abscission in Cotton Flowers
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Abstract

1. Abscission of the cotton flower usually occurs at or near the base of the internode, but sometimes in the middle. 2. A groove or surface depression generally indicates the position of the abscission zone. 3. In very young material there are no apparent histological differences setting off the abscission zone from the tissues on either side. 4. The abscission zone consists of ten to twelve rows of cells. 5. The separation layer is located near the upper or distal region of the abscission zone, and consists of one or two rows of cells. 6. The separation layer is formed by the chemical dissolution of the cell walls. 7. There is no evidence of cell division in the abscission zone of the cotton flower. 8. All the tissues across the pedicel except the tracheal tubes function in abscission. 9. The first visible indication of abscission is the swelling of the cell walls, followed by their partial solution. 10. Prior to abscission, large quantities of starch are stored in the abscission zone, which later disappears during the development of the abscission zone.

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