Photosynthetic and genetic differentiation in sun and shade populations of Holcus mollis L. |
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Authors: | J C Leclerc S Blaise |
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Institution: | (1) Laboratoire structure et metabolisme des plantes, bâtiment 430, 91405 Orsay Cedex, France;(2) Laboratoire de biologie végétale B, bâtiment 362, 91405 Orsay Cedex, France |
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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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Keywords: | Holcus mollis Poaceae Population Allopolyploï dy Genome Ecophysiology Photosynthesis Respiration |
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