Morphological delimitation and molecular evidence for allopolyploidy
in Collomia wilkenii (Polemoniaceae), a new species from northern Nevada.
As hypothesized by Heilborn (1924) and supported by most subsequent workers, allopolyploidy
is rare if present at all in Carex.
Or, is the increased scope of the tetraploid a by-product of allopolyploidy
and the genomic disruption that frequently occurs following hybridization (Sage et al.
The purpose of this study is, first, to characterize the different complexes within the group of yellow-flowered species, especially the hitherto unknown complex in North Africa, and, second, to discuss the geographical variation of this low ploidy level group (2n = 2x) in relation to the cytological variation by autopolyploidy or allopolyploidy
that is very widespread in section Polium.
Considering the complexity of the cotton genome, allopolyploidy
of New World cottons, and the diverse ecogeographical growing conditions, it was expected that cotton would have evolved great genetic diversity.
1991; Soltis and Soltis 1991), and it is almost certain that allopolyploidy
is a frequent cause of sympatric speciation in plants.
can result in "fixed" heterozygosity which would not be expected in a autopolyploid.
The number of chloroplasts in guard cells varies with ploidy (auto- including endopolyploidy, or allopolyploidy
, without a pertinent difference).
in bryophytes: Multiple origins of Plagiomnium medium.