Summary
The fine structure of the abscission zones of Lycopersicon esculentum and Nicotiana tabacum flower pedicels was studied, with special reference to structural changes in the walls of cells during the abscission process. The separation of cells appeared to be initiated primarily in the middle-lamella region of the cell walls. Disintegration of the primary wall, which usually followed breakdown of the middlelamella region, also occurred concurrently with the lysis of the middle-lamella region. During cell-wall degradation, the walls appeared to swell and became highly flexible. The walls of at least some cells in the zone of separation invaginated during the advanced stages of cell-wall disintegration, and ultimately collapsed. Cell-wall changes in abscising pedicels are almost identical to those which occur in abscising cotton and Coleus leaves, as described by Bornman (1967).
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Bornman, C. H.: Some ultrastructural aspects of abscission in Coleus and Gossypium. S. Afr. J. Sci. 63, 325–331 (1967).
Jensen, T. E., and J. G. Valdovinos: Fine structure of abscission zones I. Abscission zones of the pedicels of tobacco and tomato flowers at anthesis. Planta (Berl.) 77, 298–318 (1967).
—, and J. G. Valdovinos: Fine structure of abscission zones III. Cytoplasmic changes in abscising pedicels of tobacco and tomato flowers. Planta (Berl.) 83, 303–313 (1968).
Luft, J. H.: Improvements in epoxy resin embedding methods. J. biophys. biochem. Cytol. 9, 409–414 (1961).
Muir, R. M.: Growth hormones as related to the setting and development of fruit in Nicotiana tabacum. Amer. J. Bot. 29, 716–720 (1942).
—: The relationship of growth hormones and fruit development. Proc. nat. Acad. Sci. (Wash.) 33, 303–312 (1947).
Yager, R. E., and R. M., Muir: Interaction of methionine and indoleacetic acid in the control of abscission in Nicotina. Proc. Soc. expt. Biol. (N. Y.) 99, 321–323 (1958).
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Valdovinos, J.G., Jensen, T.E. Fine structure of abscission zones. Planta 83, 295–302 (1968). https://doi.org/10.1007/BF00385339
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DOI: https://doi.org/10.1007/BF00385339