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  • Colonizing species  (2)
  • 1,8 disubstituted triphenodioxazines  (1)
  • Breeding system  (1)
  • Springer  (4)
  • Wiley
  • American Institute of Physics (AIP)
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  • Springer  (4)
  • Wiley
  • American Institute of Physics (AIP)
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  • 1
    Digitale Medien
    Digitale Medien
    Female frequencies and fitness components between sex phenotypes among gynodioecious populations of the colonizing species Trifolium hirtum All. in California (1992)
    Springer
    Oecologia 92 (1992), S. 279-286 
    Details
    ISSN: 1432-1939
    Schlagwort(e): Colonizing species ; Ecological genetics ; Gynodioccy ; Sex ratio ; Trifolium hirtum
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary Male sterility has been recently discovered in Californian populations of rose clover (Trifolium hirtum). This study describes the frequency distribution of male sterility in Turkish and Californian populations, and compares fitness components of hermaphrodites and females. As male-steriles were found in Turkey, it is likely that they were introduced to California during the 1940's with the original material derived from Turkey. The spread of male-sterile genotypes in California has given rise to an asymmetrical frequency distribution of male sterility with positive skewness. The frequency of females has not exceeded fifty percent and it appears to be temporally stable in most of the Californian populations. The hypothesis that female frequencies and fitness differences between phenotypes are correlated was tested by comparing sex phenotypes in seven populations with contrasting levels of male sterility. The analysis of those populations showed no evidence for such a correlation as no significant differences were found between sex phenotypes for fecundity and seed germination. The hypothesis that females are maintained due to fitness differences in the progeny of hermaphrodites and females was experimentally tested in the population with maximum frequency of male-steriles. The results showed no significant differences in the demographic performance of the progenies of hermaphrodites and females. The present results are discussed in terms of the possible mechanism of maintenance of gynodioecy in rose clover.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00317376
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Breeding systems of hermaphroditic and gynodioecious populations of the colonizing species Trifolium hirtum All. in California (1992)
    Springer
    Theoretical and applied genetics 84 (1992), S. 155-160 
    Details
    ISSN: 1432-2242
    Schlagwort(e): Gynodioecy ; Colonizing species ; Mating system ; Isozymes ; Population structure
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary A multilocus procedure was used to estimate outcrossing rates in ten roadside populations of Trifolium hirtum in California. Three groups of populations were studied: cultivars, hermaphroditic, and gynodioecious (sexually dimorphic) populations. The multilocus outcrossing rate (tm) varied from 0.05 to 0.43 among populations. Population level tm estimates were significantly correlated with the observed heterozygosity in gynodioecious populations but not in hermaphroditic populations. The outcrossing rate of hermaphrodites and females was estimated in three gynodioecious populations; the estimates of tm varied from 0.09 to 0.23 for hermaphrodites and from 0.73 to 0.80 for females. The distribution of outcrossing rates in gynodioecious populations is bimodal. Our results indicate that for the levels of selfing observed among hermaphrodites, inbreeding depression is likely to be a major factor in the maintenance of females in gynodioecious populations.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00223995
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Breeding systems and population structure in Limnanthes (1985)
    Springer
    Theoretical and applied genetics 71 (1985), S. 292-299 
    Details
    ISSN: 1432-2242
    Schlagwort(e): Breeding system ; Population subdivision ; Multilocus estimator ; Inbreeding ; Selection
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary The breeding systems of seven Limanthes (Limanthaceae) populations, including one “inbreeding” and three “outbreeding” taxa, were quantified using a multilocus outcrossing rate estimator (tm) and autofertility estimates. Along with the assays of heterozygosity levels, these data were used to separate components of “effective” outcrossing in terms of Wright's equilibrium inbreeding coefficient (Fe) and adult (FA) and zygotic (FZ) fixation indices. The patchy distribution of alleles as a potential source of “substructure inbreeding” was tested from the allelic frequencies mapped along a linear transect. Evidence for consanguineous matings in restricted neighborhoods and for selection at two different life cycle stages, and the efficiency of the protandrous breeding system were noted and discussed. Multilocus estimates of outcrossing are useful for their greater precision and unbiased nature while single locus estimates can help in detecting the effects of selection and population substructure. The data generally support the “heterozygosity paradox” noted by Brown (1979) but further suggest that the paradox may often result from a lack of precision of outcrossing estimates and from overlooking the stages of the life cycle being sampled.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00252070
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    Thin-layer chromatographic analysis of some new 1,8-disubstituted triphenodioxazines (1979)
    Springer
    Chromatographia 12 (1979), S. 306-307 
    Details
    ISSN: 1612-1112
    Schlagwort(e): TLC studies of some ; 1,8 disubstituted triphenodioxazines ; using non-aqueous solvents
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Summary A thin-layer chromatographic method for the separation and identification of hitherto unknown disubstituted triphenodioxazines in submicrogram amounts has been developed using silica gel plates. The solvent systems used are acetone-petroleum ether (60∶40), benzene-petroleum ether (80∶20) and acetone-petroleum ether (50∶50). The compounds are detected by spraying the plates with 0.05 mol dm−3 sulphuric acid.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02261836
    Standort Signatur Erwartet Verfügbarkeit
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