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  • 1
    Electronic Resource
    Electronic Resource
    Allozyme variation in relation to morphology and taxonomy inMedicago sect.Spirocarpos subsect.Intertextae (Fabaceae) (1999)
    Springer
    Plant systematics and evolution 214 (1999), S. 29-47 
    Details
    ISSN: 1615-6110
    Keywords: Fabaceae ; Medicago ; Systematics ; evolution ; allozymes ; isozymes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Medicago intertexta andM. ciliaris have been controversially recognized as separate species. The only reliable diagnostic character, gland-tipped trichomes on the fruits inM. ciliaris, is controlled by presence of a single dominant allele, and such one-character taxonomies are debatable. Contributing to the difficulty,M. muricoleptis andM. granadensis, the other two species ofMedicago sectionSpirocarpos subsectionIntertextae, are sometimes confusingly similar toM. intertexta or to each other. Allozyme differences provided 95% verification of the suitability of the gland-tipped trichome character for separatingM. intertexta andM. ciliaris, thus corroborating their recognition as separate taxa. Several measures of allozyme variation indicated thatM. intertexta is more polymorphic than its sister species. Heterozygosity was also highest inM. intertexta, suggestive of a higher outcrossing rate, which is also consistent with larger floral size. Heterozygosity ofM. intertexta was concentrated in Sicily and nearby countries. Taxonomic difficulties in identifying SicilianM. intertexta are well known, and may be the result of interspecific hybridization and introgression.Medicago muricoleptis differed from the above two species in the frequency of several alleles, whileM. granadensis possessed numerous unique alleles consistent with its complete absence of genetic exchange with the other three substantially interfertile species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00985730
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Medicago truncatula f.laxicycla (Leguminosae), a new taxon with loose fruit coiling promoting rapid germination of the fruit-retained seeds (1991)
    Springer
    Plant systematics and evolution 174 (1991), S. 37-46 
    Details
    ISSN: 1615-6110
    Keywords: Angiosperms ; Leguminosae ; Medicago truncatula f.laxicycla ; M. laxispira ; Evolution ; adaptation ; seed germination ; chromosome number ; Flora of Libya
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Medicago truncatula is a member ofMedicago sect.Spirocarpos, in which all 34 species have coiled fruit, usually tightly coiled, that permanently retain the seeds. A variant ofM. truncatula from Libya is unique for the species in possessing very loosely coiled fruits, and is here recognized as a new forma,M. truncatula f.laxicycla E. Small. In germination tests of a number of species ofMedicago, the unusual Libyan variant proved to be the only one in which rapid and simultaneous germination of most of the seeds occurred while still within a fruit. The loose coiling of the fruit of the Libyan variety appears to facilitate water entry and seedling escape. Its rapid germination might adapt it to respond quickly to intermittently available moisture, but at the cost of abandoning the strategy of intermittent germination adopted by other populations ofMedicago sect.Spirocarpos.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00937692
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  • 3
    Electronic Resource
    Electronic Resource
    Isozyme variation and alleged progenitor-derivative relationships in theMedicago murex complex (Fabaceae) (1992)
    Springer
    Plant systematics and evolution 181 (1992), S. 33-43 
    Details
    ISSN: 1615-6110
    Keywords: Angiosperms ; Fabaceae ; Medicago murex ; M. lesinsii ; Systematics ; evolution ; isozymes ; chromosomes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Chromosomal studies ofMedicago lesinsii (n = 8) and its close relativeM. murex (n = 7) have led to the competing hypotheses that the latter is derived directly from the former, or that both originated from a common ancestor. In contrast to the relatively variableM. murex, M. lesinsii proved to be almost uniform isozymically, except that most populations of Greece differed by one allele from plants of the remainder of the range. This Greek variant ofM. lesinsii was indistinguishable from one of the isozyme variants ofM. murex. The greater level of allozyme variation inM. murex was consistent with its greater ecological amplitude and competitive ability. Also, this suggests thatM. murex is unlikely to have originated directly from the less variableM. lesinsii. The data suggest that either both species originated from a common ancestor, or that the n = 8 species evolved from the n = 7 species, a mode of chromosome evolution not previously hypothesized for the genus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00937585
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  • 4
    Electronic Resource
    Electronic Resource
    Preferential infestation of fruits within theMedicago truncatula — M. littoralis (Leguminosae) complex by the bean weevilBruchidius bimaculatus (1989)
    Springer
    Plant systematics and evolution 163 (1989), S. 35-41 
    Details
    ISSN: 1615-6110
    Keywords: Angiosperms ; Leguminosae ; Medicago truncatula ; Medicago littoralis ; Bruchidius bimaculatus ; Bruchid infestation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The bean weevilBruchidius bimaculatus was found in fruits of 68 of 217 populations of theMedicago truncatula — M. littoralis complex of Israel, Greece, Italy and Spain. Infestation was higher in fruits of somewhat larger than mean size, and in the more pubescent and tightly coiled fruits. Bean weevil size proved to be independent of fruit size, so that the “preference” for larger fruits does not seem due to adaptation to a larger food source or a larger domicile. Fruit size has been used to delimit the host “species”M. truncatula andM. littoralis, but the character proved to be unimodal, and it is apparent that the taxonomy of the plant complex requires further clarification. Of the 11 472 fruits examined, less than 4% were infested. Given that the plants have evolved indehiscent legumes in which typically only one of the approximately six seeds survives to reproduce, and that very few seeds of a fruit are destroyed, the bruchid's infestation appears to be non-harmful, and indeed the association may be mutualistic.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00936151
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  • 5
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    Taxonomic circumscription and identification in theMedicago sativa-falcata (alfalfa) continuum (1984)
    Springer
    Details
    Publication Date: 1984-01-01
    Print ISSN: 0013-0001
    Electronic ISSN: 1874-9364
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by Springer
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