Claim · model-written summary
Rare chlorotypes and mitotypes with restricted, patchy distribution may have relatively recent origins.
- Taxon
- Cycas taitungensis
Cycas taitungensist0 - Outcome
- relatively recent originse0
- Qualifier
- may havee0
Not reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleTreatmentComparatorSettingDirectionValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“rare chlorotypes and mitotypes with restricted and patchy distribution may have relatively recent origins”
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 Significant linkage disequilibrium in mitotype-chlorotype associations excluded recurrent homoplasious mutation as the major cause of the phylogenetic inconsistency.
- 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 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.