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Programmed-cell-death events during tapetum development of angiosperms

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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.

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  1. Dipartimento di Biologia Vegetale, Università di Firenze, via la Pira 4, I-50121, Firenze, Italy

    A. Papini, S. Mosti & L. Brighigna

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  1. A. Papini
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  2. S. Mosti
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  3. L. Brighigna
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Papini, A., Mosti, S. & Brighigna, L. Programmed-cell-death events during tapetum development of angiosperms. Protoplasma 207, 213–221 (1999). https://doi.org/10.1007/BF01283002

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