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Impairment of galactolipid biosynthesis in tomato pericarp at chilling temperature
- Source :
- Journal of Plant Physiology. 149:171-178
- Publication Year :
- 1996
- Publisher :
- Elsevier BV, 1996.
-
Abstract
- Summary Pericarp lipids of mature-green tomato fruits of three cultivars of Lycopersicon esculentum Mill., and one of L. esculentum × pimpinellifolium were analyzed to clarify the relationship between membrane lipid composition and chilling sensitivity. Only the hybrid cultivar, ( ), ripened normally at 20 °C after 16 d of chilling at 4 °C. At low temperature phospholipid content was maintained, while galactolipid content markedly declined in the four cultivars. Phosphatidylcholine content and the 18:3 content of phosphatidylcholine decreased slightly in while they increased slightly in sensitive ( ) during chilling. Before chilling, the molar ratio of di- to monogalactosyldiacylglycerol of chilling-tolerant was double that of the sensitive cultivars. This ratio increased only in during chilling. Diacylglycerol content decreased at 4 °C, while free fatty acid content and the % of 16:0, 18:0 and 18:1 in the free fatty acid fraction increased. The low degree of unsaturation of diacylglycerol and free fatty acids suggests that they were not the products of galactolipid catabolism during chilling. Phosphatidyl-glycerol fatty acid composition was similar in the four cultivars under all treatments. Taken together, our data indicate that phosphatidylglycerol is not a factor differentiating fruit-chilling sensitivity in tomato cultivars. Galactolipid biosynthesis may be impaired at chilling temperature; sensitive steps may be the acylation of glycerol-3-phosphate and the transfer of phosphatidylcholine diglyceride moieties to monogalactosyldiacylglycerol.
- Subjects :
- Phosphatidylglycerol
chemistry.chemical_classification
Galactolipid
biology
Physiology
fungi
Phospholipid
food and beverages
Fatty acid
Ripening
Plant Science
biology.organism_classification
Lycopersicon
chemistry.chemical_compound
chemistry
Biochemistry
Phosphatidylcholine
parasitic diseases
Diglyceride
Food science
Agronomy and Crop Science
Subjects
Details
- ISSN :
- 01761617
- Volume :
- 149
- Database :
- OpenAIRE
- Journal :
- Journal of Plant Physiology
- Accession number :
- edsair.doi...........43247b3cad0b380d612a14595cfed601