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Plant Physiology 66:194-196 (1980)
© 1980 American Society of Plant Biologists

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Short Communication

Density of Microbodies on Sucrose Gradients during Phytochrome-mediated Glyoxysome Peroxisome Transformation in Cotyledons of Mustard Seedlings 1

Young-Nam Hong and Peter Schopfer2

Biologisches Institut II, Universität Freiburg im Breisgau D-7800 Freiburg, Federal Republic of Germany

The microbodies extracted from the cotyledons of mustard seedlings (Sinapis alba L.) form two bands (at 1.18 kilograms per liter together with the mitochondria, and at 1.24 kilograms per liter) on conventional isopycnic sedimentation density gradients. The artifactual co-banding of part of the microbodies with the mitochondria can be prevented by using flotation gradients. Using this procedure, a systematic investigation revealed no effect of seedling age and irradiation (far red or white light) on the density of the microbody population (1.242 ± 0.002 kilograms per liter). Thus, although light, through phytochrome, induces conspicuous changes in their enzyme composition the microbodies appear as a homogeneous population of constant density on a sucrose gradient.

2 To whom reprint requests should be addressed.

1 Supported by Deutsche Forschungsgemeinschaft (SFB 46).




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M. Desai and J. Hu
Light Induces Peroxisome Proliferation in Arabidopsis Seedlings through the Photoreceptor Phytochrome A, the Transcription Factor HY5 HOMOLOG, and the Peroxisomal Protein PEROXIN11b
Plant Physiology, March 1, 2008; 146(3): 1117 - 1127.
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Copyright © 1980 by the American Society of Plant Biologists