Abstract
In order to investigate the effects of water stress on the photosynthetic compartment, analysis of chloroplast polar lipids and their fatty acid composition was made. Cotton (Gossypium hirsutum L. cv. Reba) plants were submitted to water stress by witholding irrigation. Chloroplasts were purified on a Percoll gradient and three fractions were collected: intact, apparently intact and broken chloroplasts. The percentage of broken chloroplasts increased with a decrease in leaf water potential, indicating a greater weakness of the membrane. Galactolipid content (expressed as mg lipid per mg chlorophyll), particularly digalactosyldiglyceride, decreased with decreasing water potential. Phospholipid content decreased in the broken chloroplast fraction. The fatty acid composition of chloroplasts was also affected. The perecentage of linolenic acid (18:3), the major fatty acid of thylakoids, decreased, whereas that of linoleic acid(18:2) and oliec acid (18:1) increased. An accumulation of fatty acids having less than 16 carbon atoms was also observed. These changes in the lipid and fatty acid composition of cotton chloroplasts under water stress might affect the properties of the thylakoid membrane and thereby the photosynthetic activity and the compartmentation of the leaf cells.
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Dates
Type | When |
---|---|
Created | 19 years, 4 months ago (April 30, 2006, 6:48 p.m.) |
Deposited | 1 year, 10 months ago (Oct. 20, 2023, 5:44 p.m.) |
Indexed | 2 months, 3 weeks ago (June 10, 2025, 10:46 p.m.) |
Issued | 40 years, 11 months ago (Oct. 1, 1984) |
Published | 40 years, 11 months ago (Oct. 1, 1984) |
Published Online | 19 years, 4 months ago (April 28, 2006) |
Published Print | 40 years, 11 months ago (Oct. 1, 1984) |
@article{Ferrari_Iliou_1984, title={Effect of water stress on the lipid and fatty acid composition of cotton (Gossypium hirsutum) chloroplasts}, volume={62}, ISSN={1399-3054}, url={http://dx.doi.org/10.1111/j.1399-3054.1984.tb00374.x}, DOI={10.1111/j.1399-3054.1984.tb00374.x}, number={2}, journal={Physiologia Plantarum}, publisher={Wiley}, author={Ferrari‐Iliou, Roselyne and Thi, Anh Thu Pham and da Silva, Jorge Vieira}, year={1984}, month=oct, pages={219–224} }