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Changes in chloroplast number per cell during leaf development in spinach

Planta volume 86, pages 186–194 (1969)Cite this article

Summary

The amounts of chlorophyll and nitrogen and the numbers of cells per unit area change as the green leaves of spinach plants grow and increase in size in the light. The changes in the numbers of chloroplasts per cell were measured by a new method. A 5-fold increase in the numbers of chloroplasts per cell took place in both palisade and mesophyll cells over a growing period of 10 days during which time the area of the leaves increased from 1 to 50 cm2. Proplastids were not present in the young green leaves but electron-microscope and phase-contrast observations showed the presence of grana-containing chloroplasts, many of which appeared to be undergoing division by constriction. It is suggested that the large increase in chloroplast numbers as leaf cells grow and expand in the light is from the division of differentiated chloroplasts containing grana.

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Affiliations

  1. CSIRO Division of Horticultural Research, Glen Osmond

    J. V. Possingham & W. Saurer

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  1. J. V. Possingham
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  2. W. Saurer
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Possingham, J.V., Saurer, W. Changes in chloroplast number per cell during leaf development in spinach. Planta 86, 186–194 (1969). https://doi.org/10.1007/BF00379826

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  • DOI: https://doi.org/10.1007/BF00379826

Keywords

  • Nitrogen
  • Chlorophyll
  • Unit Area
  • Green Leaf
  • Mesophyll Cell