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Plastid Developmental Pathways in Some Angiosperm Reproductive Cells

  • Ettore Pacini
  • Philip E. Taylor
  • Mohan B. Singh
  • R. Bruce Knox

Abstract

Plants such as algae and mosses have only one plastid type i.e. the chloroplast, their number is very low per cell. From pteridophyta onwards other plastid types appear; in angiosperm at least five plastid types are recognized: proplastid, amyloplast, chloroplast, chromoplast, elaioplast (Schnepf, 1980). Some authors such as Whatley (1977) distinguish seven types. The number per cell in angiosperm is high and constant for each cell type (Butterfass, 1979). Plastid types are recognized by classical cytologists on the basis of their appearance under EM rather than their metabolism. Chloroplast is the only plastid type where we are reasonably sure that the morphology corresponds to the metabolic activity of this organelle engaged in the photosythetizing activity. The products of the photosynthesis, the starch can be present inside: a) chloroplasts; b) amyloplasts; c) proplastid. The period of storage lasts a few hours in case a), is undeterminate in case b); ranges from few hours to some months in case c). Sometimes it is difficult to distinguish proplastids from amyloplasts. We define plastids as amyloplasts when the starch fills the stroma and proplastids when only a few granules per plastid are present.

Keywords

Sperm Cell Ripe Pollen Angiosperm Pollen Plastid Development Lycopersicum Peruvianum 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag New York, Inc. 1992

Authors and Affiliations

  • Ettore Pacini
  • Philip E. Taylor
  • Mohan B. Singh
  • R. Bruce Knox

There are no affiliations available

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