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Photosynthetic and genetic differentiation in sun and shade populations of Holcus mollis L.

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Abstract

Three Holcus mollis L. populations, one with 2n = 28 chromosomes living in a forest and two with 2n = 35 chromosomes, the first living in a forest, the second in open land, are compared for photosynthesis.

Simultaneous measurements of oxygen and carbon dioxide, either in high light, low light, or dark experiments indicate that the 2n = 28 chromosomes population is photosynthetically well adapted to shade, while 2n = 35 chromosomes forest population, is not.

The 2n = 35 chromosomes plants growing in the forest does not automatically acquire the photosynthetic character of a shade plant, the genome must show an evolution for this. In our study, only the plants with 2n = 28 chromosomes demonstrated the shade adaptation.

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Authors and Affiliations

  1. Laboratoire structure et metabolisme des plantes, bâtiment 430, 91405, Orsay Cedex, France

    J. C. Leclerc

  2. Laboratoire de biologie végétale B, bâtiment 362, 91405, Orsay Cedex, France

    S. Blaise

Authors
  1. J. C. Leclerc
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  2. S. Blaise
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Leclerc, J.C., Blaise, S. Photosynthetic and genetic differentiation in sun and shade populations of Holcus mollis L.. Vegetatio 92, 85–93 (1991). https://doi.org/10.1007/BF00047134

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  • DOI: https://doi.org/10.1007/BF00047134

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