from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Having two or more complete sets of chromosomes derived from different species.
- n. An allopolyploid organism.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Having multiple complete sets of chromosomes derived from different species
- n. Such an organism
Tragopogon miscellus and T. mirus, two allopolyploid species of goatsbeard, may have formed as many as 20 and 12 times, respectively, in eastern Washington and adjacent Idaho (USA) in only the past 60 – 70 years; multiple polyploidizations have even occurred within single small towns
By analyzing DNA sequences of two single-copy nuclear genes and the genomic AFLP data, we assess the allopolyploid origin of A. collina-4x from ancestors corresponding to A. setacea-2x and A. asplenifolia-2x, and the ongoing backcross introgression between these diploid progenitor and tetraploid progeny lineages.
Semi-congruent splits of an AFLP Neighbor Net link not only A. collina-4x to both diploid species, but some 4x individuals in a polymorphic population with mixed ploidy levels to A. setacea-2x on one hand and to A. collina-4x on the other, indicating allopolyploid speciation as well as hybridization across ploidal levels.
Genomic and cDNA CAPS analyses indicated that plants representing multiple populations of this young natural allopolyploid have experienced frequent and preferential elimination of homeologous loci.
We therefore examined patterns of loss and expression in duplicate gene pairs (homeologs) in multiple individuals from seven natural populations of independent origin of Tragopogon mirus (Asteraceae), an allopolyploid that formed repeatedly within the last 80 years from the diploids T. dubius and T. porrifolius.
Hopper SD (2001) From Dampier to DNA: the 300-year-old mystery of the identity and proposed allopolyploid origin of
Both species are perennial, outcrossing allopolyploid grasses belonging to the wheat tribe Triticeae (Dewey, 1984; Löve, 1984).
allopolyploids are generated by hybridization between two related species. the hybrid is sterile. however, sometimes chromosomal doubling occurs, restoring fertility. if the two parental species are diploid, the resulting allopolyploid is called allotetraploid.
allopolyploid : polyploids created by hybridization between different species homeologous chromosomes
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