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Plant Physiology 69:1387-1391 (1982)
© 1982 American Society of Plant Biologists

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Chloroplast DNA Levels and the Control of Chloroplast Division in Light-Grown Wheat Leaves 1

Stephen A. Boffey2 and Rachel M. Leech

Department of Biology, University of York, York Y01 5DD, United Kingdom

Plastids at different stages of development were isolated from light-grown wheat (Triticum aestivum, var. Maris Dove) seedling leaves, and the average chloroplast DNA (cpDNA) per plastid at each developmental stage was measured directly. In the earliest stages of development, the number of plastids per cell and the amount of cpDNA per cell increased with cell age, but cpDNA per plastid remained constant at between 800 and 1,000 genome copies per plastid. After this phase, plastids per cell continued to increase, but cpDNA per plastid decreased. Subsequently, both plastids per cell and cpDNA per plastid remained constant as cell age increased, the final DNA content being approximately 300 genome copies per plastid. These results are related to previous reports of cpDNA changes during the development of dicotyledonous plants, and to theories about the regulation of chloroplast numbers per cell.

2 Permanent address: Department of Biological Sciences, The Hatfield Polytechnic, P.O. Box 109, Hatfield, Herts AL10 9AB, U.K.

1 Supported by the Science Research Council and the Agricultural Research Council.




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Copyright © 1982 by the American Society of Plant Biologists