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Chemical composition of seed saponins as a guide to the classification of Medicago species


, : Chemical composition of seed saponins as a guide to the classification of Medicago species. Canadian Journal of Botany 70(7): 1384-1387

The presence of saponins and their aglycones (sapogenins) was surveyed in seeds of 33 species of Medicago (Fabaceae). The four major subsections of the largest taxonomic section of Medicago, section Spirocarpos, can generally be distinguished by presence and (or) absence of medicagenic acid and zanhic acid. The latter sapogenin was found only in three of the subsections of Spirocarpos and seems to reflect the phylogenetic recency of these groups within Medicago. The distribution of zanhic acid in combination with other considerations proved useful in establishing that Medicago granadensis seems to be the oldest species in subsection Interextae. The saponin profile of Medicago hybrida, most recently assiged to section Medicago, strongly supports the placement of this species and its relative Medicago sufruticosa in a separate section. Hemolytic saponins proved to be much more common in those species of Medicago that retain their seeds permanently within the fruit compared with species that tend to scatter their seeds, possibly because the former can benefit more from the antiherbivorous and (or) allelopathic properties of the saponins.

US$19.90

DOI: 10.1139/b92-174


Other references

Mukherjee, A.B., 1998: Nickel: a review of occurrence, uses, emissions, and concentration in the environment in Finland. A survey is presented which represents a review of current knowledge concerning Ni and its compounds in the Finnish environment. In Finland, primary Ni production takes place by the direct high-grade Ni matte flash smelting process. Domestic produ...

Coleman, A.L.; Yu, F.; Ensrud, K.E.; Stone, K.L.; Cauley, J.A.; Pedula, K.L.; Hochberg, M.C.; Mangione, C.M., 2010: Impact of age-related macular degeneration on vision-specific quality of life: Follow-up from the 10-year and 15-year visits of the Study of Osteoporotic Fractures. To assess vision-specific quality of life (QOL), based on abbreviated surveys derived from the National Eye Institute Visual Function Questionnaire (NEI-VFQ), in a cohort of United States women who participated in the Study of Osteoporotic Fractur...

Saarento, O.; Oiesvold, T.; Göstas, G.; Christiansen, L.W.; Lindhardt, A.; Lönnerberg, O.; Sandlund, M.; Hansson, L., 1996: The Nordic Comparative Study on Sectorized Psychiatry. III. Accessibility of psychiatric services, degree of urbanization and treated incidence. As part of a Nordic Comparative Study on Sectorized Psychiatry, accessibility of psychiatric services and degree of urbanization in seven catchment areas were related to treated incidence. One-year treated incidence cohorts were used. Accessibilit...

Kulikov, D.V.; Zalesskii, S.K., 1951: Mechanized sowing of granular superphosphate together with the seeds of grain crops.. Sowing by a reel apparatus of a mixture of grain seeds and granular fertilizers can be recommended provided the following conditions are observed: -(1) the size of the granules does not exceed 6 mm., (2) the proportion of super, granules less than...

Font Robert, 1992: Prediction of hydrocarbon-water contacts and height of pay columns using pressure and fluid gradient data; a case history of engineering geology applications to petroleum exploration. Bulletin of the Association of Engineering Geologists: , Pages 426-430. 1992.

Keller, F.; Knöfler, W.; Schreiber, H., 1985: Biocompatibility of implants with and without fluorohydrocarbon glow polymer coating. 4. Recommendations for the histocompatibility (repair) index for the evaluation of various implant materials. The measurement of the thickness of the fibrous capsula around implant materials to different titmes and the material dependent speed of the subsidence process of the tissue reaction were formed to an index. The derivation of the index is describe...

Yezhmanska, A., 1985: A new specific name for bony fishes of the genus Hemirhamphus. Paleontologicheskii Zhurnal (3): 110

Huang, C.Y.; Chang, A.K.; Nixon, P.F.; Duggleby, R.G., 2001: Site-directed mutagenesis of the ionizable groups in the active site of Zymomonas mobilis pyruvate decarboxylase: Effect on activity and pH dependence. Pyruvate decarboxylase (PDC, EC 4.1.1.1) is a thiamin diphosphate-dependent enzyme about which there is a large body of structural and functional information. The active site contains several absolutely conserved ionizable groups and all of these...

Dilcher D.L., 1973: A revision of the Eocene flora of southeastern North America. Taxonomic revision of angiosperms described by E. W. Berry (1916, 1924, 1930, 1941), age revised from Wilcox to Claiborne, paleoecology.

Wright B.S.; Tyler G.A.; Caporale L.H.; Rosenblatt M., 1986: Immunoprecipitation of the parathyroid hormone receptor. Federation Proceedings 45(6): 1736