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  • 1
    Electronic Resource
    Electronic Resource
    Electrophoretic evidence for the origins of tetraploids and hybrids ofSphenomeris chinensis sensu lato (Lindsaeaceae) in Japan (1996)
    Springer
    Journal of plant research 109 (1996), S. 201-209 
    Details
    ISSN: 1618-0860
    Keywords: Allopolyploid ; Electrophoresis ; Hybrid origin ; Sphenomeris ; Sphenomeris yaeyamensis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Hypotheses for the origins of tetraploids and hybrids ofSphenomeris chinensis sensu lato in Japan were tested using electrophoretic analysis of isozymes. Comparison of banding patterns supported the hypothesis that plants having abortive spores had resulted following hybridization between diploidS. chinensis var.chinensis andS. biflora and between diploid var.chinensis andS. gracilis. Results from isozymic analyses also revealed thatS. intermedia probably originated through allotetraploid speciation following hybridization between var.chinensis andS. biflora. There were two electrophoretic variants among tetraploids ofS. chinensis. One variant, restricted to the southern Ryukyu Islands, is probably an allotetraploid of hybrid origin between diploidS. chinensis andS. gracilis. It has been described as a new species,S. yaeyamensis Lin, Kato & K. Iwatsuki. The other variant, morphologically corresponding to var.chinensis, is distributed at least throughout southern Japan and also in northern Thailand. Its origin is uncertain, but one of the parents is probably diploidS. chinensis. Sphenomeris intermedia andS. yaeyamensis occur inland, whereas the parentalS. biflora andS. gracilis are halophilous and rheophllous, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02344546
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  • 2
    Electronic Resource
    Electronic Resource
    Electrophoretic variation of the apogamousDryopteris varia group (Dryopteridaceae) (1995)
    Springer
    Journal of plant research 108 (1995), S. 451-456 
    Details
    ISSN: 1618-0860
    Keywords: Apogamous species ; Dryopteris varia ; Electrophoresis ; Hybrid ; Ploidy reduction ; Polyploid
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A total of 35 electrophoretic variants were detected in four apogamous species of theDryopteris varia group: 14 variants inD. bissetiana triploids, 7 inD. sacrosancta triploids, 6 inD. varia triploids, 3 inD. pacifica triploids, and 5 in apogamous diploids. The variants differed from each other in various combinations of a few alleles which were common in some of the variants, suggesting recurrent origin.Dryopteris insularis var.insularis (2x) and var.chichisimensis (3x), other members of the group, were electrophoretically monomorphic, suggesting single origin. Banding patterns infer that triploids ofD. bissetiana andD. sacrosancta may have originated from hybrids whose parent is the sexualD. saxifraga, whereas this species was not involved in the origin of the other apogamous triploids and the apogamous diploids. The other parent was also discussed and we proposed a hypothesis that diploid offsprings fromD. pacifica triploids hybridized withD. saxifraga giving rise to triploids ofD. bissetiana andD. sacrosancta.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02344233
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