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Journal of Cell Science, Vol 8, 317-329, Copyright © 1971 by Company of Biologists

Submitted on June 29, 1970

Fine Structure Study of Pollen Development in Haemanthus katherinae Baker

III. Changes in Organelles During Development of the Vegetative Cell

JEAN M. SANGER 1 and W. T. JACKSON 1

1 Department of Biological Sciences, Dartmouth College, Hanover, New Hampshire 03755, U.S.A.

The newly formed vegetative cell of the pollen grain of the African blood lily has a spheroidal nucleus, few dictyosomes, and a small amount of endoplasmic reticulum. Plastids are smaller than those of the microspore and usually lack starch granules. Mitochondria and lipid bodies are more numerous than they were in the microspores, but their appearance is unchanged. As the pollen grain matures, the vegetative nucleus becomes irregular in shape. There is a dramatic increase in the number of dictyosomes, starch accumulates in the plastids, and a moderately well developed system of endoplasmic reticulum appears in the form of flat cisternae. In the developmental period immediately preceding anthesis, the vegetative nucleus becomes lobate and small nucleoli replace the large nucleoli present earlier. Plastids lose their starch, lipid bodies disappear, and the endoplasmic reticulum becomes vesicular in this final stage before germination.

Submitted on June 29, 1970






© The Company of Biologists Ltd 1971