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Journal of Cell Science, Vol 12, 391-401, Copyright © 1973 by Company of Biologists

Submitted on June 5, 1972

Light Saturation of Growth and Photosynthesis of the Shade Plant Marchantia Polymorpha

R. MACHE 1 and S. LOISEAUX 1

1 Laboratoire de Physiologie Végétale, Université I de Grenoble (38), France

The growth rate of the shade plant Marchantia was at its maximum for a low illumination, 2-3 x 103 lx, and was inhibited by an excess of light.

Photosynthesis by intact thalli and by isolated chloroplasts of Marchantia was saturated by a light intensity of 2-3 x 103 lx. These isolated chloroplasts were able to carry on satisfactory rates of photosynthesis, up to 35 µM CO2/h/mg chlorophyll.

The Hill reaction and photosystem II were also saturated by the same light intensities, demonstrating that the factor limiting the light saturation of photosynthesis is located in the chloroplast. The structure of chloroplasts was strongly modified by an excess of light, small grana and fret membranes being replaced by continuous grana.

Submitted on June 5, 1972






© The Company of Biologists Ltd 1973