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Description and CO₂ Metabolism of Aberrant and Normal Chloroplasts in Variegated Cotton, Gossypium hirsutum L.¹

Mutant chloroplasts in variegated cotton leaves contained reduced amounts of pigments, were smaller, and lacked any well defined grana system when compared with normal green chloroplasts. Replication of the defective chloroplasts was not altered. Mutant leaves fixed reduced amounts of ¹⁴CO₂ by photosynthesis, and the white leaves had a shift in the distribution of the products of ¹⁴CO₂ fixation. Mutant leaves utilized ¹⁴C-2-acetate as effectively as green leaves.

Key Words: Chlorophyll and carotenoid concentration • ¹⁴CO₂ fixation • ¹⁴C-2-acetate metabolism • Chloroplast growth and replication

² Research Geneticist, Crops Research Division, Agricultural Research Service, U. S. Department of Agriculture and Professor of Plant Physiology, Plant Sciences Department, Texas A & M University, respectively, College Station, Texas 77843.

Received for publication September 19, 1970.