Plant Physiology 99:197-202 (1992)
© 1992 American Society of Plant Biologists
Environmental and Stress Physiology
A Role for Membrane Lipid Polyunsaturation in Chloroplast Biogenesis at Low Temperature 1
Suzanne Hugly and
Chris Somerville
Michigan State University-Department of Energy Plant Research Laboratory, Michigan State University, East Lansing, Michigan 48824
Two different mutants of Arabidopsis thaliana deficient in chloroplast membrane lipid polyunsaturation were indistinguishable in appearance from the wild-type when grown at 22°C. By contrast, leaf tissues of the mutants that developed during growth at 5°C were chlorotic, whereas the wild type was not. This is the first direct evidence that chloroplast lipid polyunsaturation contributes to low-temperature fitness. Chloroplasts from mutant lines grown at 5°C were much smaller than those of the wild-type, and the thylakoid membrane content was reduced by up to 70%. However, there was no discernible effect of low temperature on chloroplasts that developed prior to exposure to low temperatures. These and related observations suggest that the high degree of chloroplast membrane lipid polyunsaturation is required for some aspect of chloroplast biogenesis.
1 This work was supported in part by grants from the U.S. Department of Agriculture Competitive Research Grants Office (89-37264-4838) and the U.S. Department of Energy (DE-FG02-90ER20021).
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