The central cell is the binucleate cell of the angiosperm megagametophyte which contains the polar nuclei and participates in double fertilization. The structure of the mature central cell, the fusion of the polar nuclei and the primary endosperm nucleus were studied with the electron microscope. The central cell cytoplasm appears very active and has an extensive ER, many mitochondria, dictyosomes, microbodies, polysomes, chloroplasts with well developed grana and starch and lipid reserves. A single, giant mitochondrion appears in the cytoplasm near the polar nuclei at the time of fertilization, but its origin, fate and function are not known. Cytoplasmic aggregates of dense, granular material are associated with the primary endosperm nucleus and structurally resemble the nucleolus and similar aggregates in the nucleoplasm. It is suggested that these cytoplasmic perinuclear bodies may represent extruded nucleolar material. The central cell cytoplasm does not undergo any notable structural reorganization as a result of fertilization. The relationship of the central cell to the other cells of the mature megagametophyte and its possible role in embryogenesis is discussed.
Skip Nav Destination
JOURNAL ARTICLE| 01 May 1973
Capsella Embryogenesis: The Central Cell
Department of Biology, Rosary College, River Forest, Illinois 60305, U.S.A.
W. A. JENSEN
Department of Botany, University of California Berkeley, California 94720, U.S.A.
Received: 25 Aug 1972
Online Issn: 1477-9137
Print Issn: 0021-9533
Copyright © 1973 The Company of Biologists Ltd.
- Views Icon Views
- PDF LinkPDF
- Share Icon Share
- Search Site
PATRICIA SCHULZ, W. A. JENSEN; Capsella Embryogenesis: The Central Cell. J Cell Sci 1 May 1973; 12 (3): 741–763. doi: https://doi.org/10.1242/jcs.12.3.741
Download citation file: