Apomixis, hybridization, and taxonomic complexity in eastern north AmericanAmelanchier (Rosaceae)

@article{Campbell2008ApomixisHA,
  title={Apomixis, hybridization, and taxonomic complexity in eastern north AmericanAmelanchier (Rosaceae)},
  author={Christopher S. Campbell and Wesley A. Wright},
  journal={Folia Geobotanica},
  year={2008},
  volume={31},
  pages={345-354}
}
Apomixis and hybridization together contribute to taxonomic complexity inAmelanchier. Hybridization combines genetically divergent genomes and spawns new forms that apomixis perpetuates. Apomixis is aposporous, facultative, and pseudogamous in the genus, and apomicts are generally polyploid, pollen fertile, and pollinated by generalists. That gene flow actually occurs is empirically evident. As apomixis is genetically dominant over sexuality, hybrids involving at least one apomictic parent are… Expand

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References

SHOWING 1-10 OF 39 REFERENCES
Reproductive Biology in Subfam. Maloideae (Rosaceae)
TLDR
Crosses between apomictic and sexual taxa yield apomic offspring in most cases, indicating, along with other studies, that apomixis is genetically dominant over sexuality in the Maloideae. Expand
BREEDING SYSTEM OF A HYBRID BETWEEN A SEXUAL AND AN APOMICTIC SPECIES OF AMELANCHIER, SHADBUSH (ROSACEAE, MALOIDEAE)
TLDR
Control pollinations indicate that seed formation between A. bartramiana and A. laevis is possible and that the hybrids are self-compatible, and principal components and canonical discriminant analyses of seven morphological characters substantiate morphological intermediacy of the hybrids. Expand
Population Structure and Reproductive Ecology in the Maloideae (Rosaceae)
TLDR
Rigorous evaluation is necessary in view of the possibility that much of the taxonomic complexity of genera such as Amelanchier, Crataegus, and Sorbus is due at least in part to naive assumptions about population structure in these genera on the part of earlier taxonomists. Expand
Variation and species limits in agamospermous grasses.
TLDR
Whether morphology, interbreeding, strict monophyly, or other cohesive mechanisms are used as criteria of conspecificity, the taxonomic conclusion is the same: an entire complex must be treated as a single species. Expand
Apomixis in Plants
TLDR
This review focuses on the development of Apomixis and its applications in Sexual Plants and Polyploidy, as well as on the models used in Embryology and Cytology for Gene Regulation. Expand
Pollen-mediated introgression and hybrid speciation in Louisiana irises.
TLDR
Individuals analyzed from a contemporary hybrid population demonstrate multilocus genotypes that are indicative of advanced-generation hybrid individuals that demonstrate the power of the polymerase chain reaction methodology for the rapid identification of random and specific genetic markers for testing evolutionary genetic hypotheses. Expand
Clonality as a part of the evolution process inTaraxacum
TLDR
Agamospermy is shown to significantly reduce recombination processes; it should not be considered an absolute evolutionary “blind alley”. Expand
Studies in Crataegus L. (Rosaceae: Maloideae). XIII. Degree and Pattern of Phenotypic Variation in Crataegus sect. Crus-galli in Ontario
TLDR
It appears that the partitioning of variability in C. crus-galli may be explained by features of dispersal, habitat preference, and the occurrence of uniparental reproduction, which suggest possible explanations for the very narrow circumscriptions and limited distributions of many North American Crataegus taxa de- scribed at the beginning of the twentieth century. Expand
Apomixis in Amelanchier laevis, Shadbush (Rosaceae, Maloideae)
TLDR
Evidence for apospory and pseudogamy, the first to be reported in Amelanchier, conforms to the general pattern found in other apomictic genera of the Maloideae. Expand
Topodeme differentiation in Ontario taxa of Crataegus (Rosaceae: Maloideae): leaf morphometric evidence
TLDR
Variation in the two-dimensional shape of short-shoot subterminal leaves was examined quantitatively in samples of nine topodemes of Crataegus section Crus-galli Loud and resembled those obtained earlier with these taxa, with flower and fruit data. Expand
...
1
2
3
4
...