Low molecular weight organic acids and fatty acids in root exudates of two Lupinus cultivars at flowering and fruiting stages

Low molecular weight organic acids (LOAs) and fatty acids in root exudates of two lupin cultivars, Lupinus albus cv. Multolupa and L. luteus cv. Tremosilla, were determined at flowering and fruiting stages. LOAs were analysed by capillary electrophoresis. Acetic and citric acids were the most abunda...

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Published in:Phytochemical analysis 2001-09, Vol.12 (5), p.305-311
Main Authors: Lucas García, J. A., Barbas, C., Probanza, A., Barrientos, M. L., Gutierrez Mañero, F. J.
Format: Article
Language:English
Subjects:
Acids - analysis
Acids - chemistry
Capillary zone electrophoresis
Chromatography, Gas
Electrophoresis, Capillary
Fabaceae - chemistry
Fatty Acids - analysis
Fatty Acids - chemistry
high resolution gas chromatography
Lupinus albus
Lupinus luteus
Molecular Weight
organic acids
Organic Chemicals - analysis
Organic Chemicals - chemistry
phospholipid fatty acids
Phospholipids - chemistry
Plant Roots - chemistry
Reproducibility of Results
root exudates
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Summary:Low molecular weight organic acids (LOAs) and fatty acids in root exudates of two lupin cultivars, Lupinus albus cv. Multolupa and L. luteus cv. Tremosilla, were determined at flowering and fruiting stages. LOAs were analysed by capillary electrophoresis. Acetic and citric acids were the most abundant, especially the latter in L. luteus at the flowering stage (5922.79 µg/g dry root). The significant decrease in acid content of both cultivars from flowering to fruiting stages was also striking. The highest levels of acetic acid were detected in L. luteus at fruiting stage (1542.03 µg/g dry root). The significant citrate production in L. luteus could be related to the low phosphorus concentration in the studied soils but not to proteoid roots, which were detected only in L. albus. The source of the LOAs detected in these exudates is also discussed, since they may be produced either by the plant or by the associated rhizobacteria. The profile of phospholipid fatty acids was determined by high‐resolution GC. A high level of 18:2ω6 (a fatty acid specific to fungi) was found in exudates of L. luteus (a mycorrhizal plant) in contrast to L. albus (a non‐mycorrhizal plant). Copyright © 2001 John Wiley & Sons, Ltd.
ISSN:0958-0344
1099-1565
DOI:10.1002/pca.596