Abstract
Phosphatidylcholine and monogalactosyldiacylglycerol are the proposed substrates for fatty acid desaturation to form linolenic acid (18:3) in plant tissues. A comparative analysis of the compositions of PC and MGDG molecular species, together with determination of total fatty acids, was conducted in the soybean cv. Century and in C1640, a low 18:3 mutant, to evaluate the expression of this mutation in the two classes of lipids among various tissues. Seeds of C1640 and A5, another low 18:3 mutant, had decreased 18:3 levels in cotyledons and axes but not in seed coats. Vegetative tissues of C1640 and A5 had lower 18:3 levels in roots but not in leaves and stems. The amount (mo1%) of 16:0/18:3 and 18:3/18:3 PC species in cotyledons and 18:3-containing PC species in axes, decreased in C1640 compared to Century. The reduction of 16:0/18:3 and 18:3/18:3 species in both PC and MGDG also occurred in roots but little alteration existed in leaves and stems of C1640. The present results suggest the existence of a possible common mechanism for the formation of 18:3 in roots and seeds which is different from leaves and stems.
Original language | English |
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Pages (from-to) | 411-414 |
Number of pages | 4 |
Journal | Phytochemistry |
Volume | 28 |
Issue number | 2 |
DOIs | |
State | Published - 1989 |
Bibliographical note
Funding Information:Acknowledgements-~~Thwiso rk was supported by the American Soybean Association. We are grateful to Dr J. Wilcox and Dr Fehr for supplying us with Cl640 and A5 seeds,r espectively.
Keywords
- Glycine max
- Leguminosae
- fatty acids
- linolenic acid
- lipid desaturation.
- mutants
ASJC Scopus subject areas
- Biochemistry
- Molecular Biology
- Plant Science
- Horticulture