ISSN:
1615-6102
Keywords:
Apoptosis
;
Tapetum
;
Tillandsia albida
;
Lobivia rauschii
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Summary Programmed-cell-death events in the tapetum of two angiosperms (Lobivia rauschii Zecher andTillandsia albida Mez et Purpus) are described by ultrastructural methods. Tapetum degradation appears to be a type of programmed cell death, with the cellular remnants necessary for pollen development, acting as products of holocrine secretion. Diagnostic features of apoptosis during tapetum development are: general shrinkage of the whole cell and the nuclei; condensation of the chromatin at the periphery of the internal nuclear membrane; the enlargement of the endoplasmicreticulum cisternae to circumscribe portions of the cytoplasm; the persistence of mitochondria together with microfilament bundles until the last stages of tapetal degeneration.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01283002
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