Claim · model-written summary
Significant linkage disequilibrium in mitotype-chlorotype associations excluded recurrent homoplasious mutation as the major cause of the phylogenetic inconsistency.
- Taxon
- Cycas taitungensis
Cycas taitungensist0 - Outcome
- linkage disequilibrium in mitotype-chlorotype associationse0
Not reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleTreatmentComparatorSettingDirectionValueQualifier
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Significant linkage disequilibrium in mitotype-chlorotype associations excluded the possibility of the recurrent homoplasious mutations as the major force causing phylogenetic inconsistency”
t0“Cycas taitungensis”
Title
Organelle DNA phylogeography of Cycas taitungensis, a relict species in Taiwan
S. Huang; Y. C. Chiang; B. A. Schaal; et al. Molecular Ecology 2001. doi:10.1046/j.0962-1083.2001.01395.x
Other claims from this paper (12)
- Observation Cycas taitungensis showed high levels of genetic variation at both organelle loci, attributed to frequent intramolecular recombination.
- Observation Cycas taitungensis showed low levels of genetic differentiation.
- Observation The apportionment of genetic variation within and between populations agreed with a migrant-pool model.
- Observation Phylogenies from cpDNA and mtDNA were discordant in neighbour-joining analyses.
- Observation Four chlorotypes (clades I-IV) were identified from minimum spanning networks.
- Observation Five mitotypes (clades A-E) were identified from minimum spanning networks.
- Observation The most abundant chlorotype I was associated with all mitotypes and the most abundant mitotype C with all chlorotypes; no combinations of rare mitotypes with rare chlorotypes were found.
- Mechanism The nonrandom associations may be ascribed to relative ages among alleles associated with geological history, according to nested clade analyses.
- Observation The most dominant cytotypes CI and EI may represent ancestral haplotypes of C. taitungensis that existed long before the Pleistocene glacial maximum.
- Observation Rare chlorotypes and mitotypes with restricted, patchy distribution may have relatively recent origins.
- Observation Newly evolved low-frequency mtDNA genetic elements were likely associated with the dominant chlorotype, and vice versa, giving the nonrandom mitotype-chlorotype associations.
- Observation Paraphyly of CI and EI cytotypes, leading to low genetic differentiation between cycad populations, indicated a short period of isolation.