Intergenomic rearrangements after polyploidization of Kengyilia thoroldiana (Poaceae: Triticeae) affected by environmental factors

Polyploidization is a major evolutionary process. Approximately 70-75% species of Triticeae (Poaceae) are polyploids, involving 23 genomes. To investigate intergenomic rearrangements after polyploidization of Triticeae species and to determine the effects of environmental factors on them, nine popul...

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Bibliographic Details
Published in:PloS one 2012-02, Vol.7 (2), p.e31033-e31033
Main Authors: Wang, Qiuxia, Liu, Huitao, Gao, Ainong, Yang, Xinming, Liu, Weihua, Li, Xiuquan, Li, Lihui
Format: Article
Language:English
Subjects:
Agriculture
Alpine environments
Altitude
Barley
Biological evolution
Biology
Breeding of animals
Chromosome translocations
Chromosomes
Chromosomes, Plant - genetics
Crop science
Environment
Environmental effects
Environmental factors
Gene expression
Gene Rearrangement - genetics
Genetic diversity
Genetic Variation
Genome, Plant - genetics
Genomes
Genomics
Genotype
Grasses
Grasslands
Hybridization
Kengyilia thoroldiana
Plant reproduction
Poaceae
Poaceae - genetics
Polyploidy
Populations
Species
Studies
Translocation
Triticeae
Valleys
Y chromosomes
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Summary:Polyploidization is a major evolutionary process. Approximately 70-75% species of Triticeae (Poaceae) are polyploids, involving 23 genomes. To investigate intergenomic rearrangements after polyploidization of Triticeae species and to determine the effects of environmental factors on them, nine populations of a typical polyploid Triticeae species, Kengyilia thoroldiana (Keng) J.L.Yang et al. (2n = 6x = 42, StStPPYY), collected from different environments, were studied using genome in situ hybridization (GISH). We found that intergenomic rearrangements occurred between the relatively large P genome and the small genomes, St (8.15%) and Y (22.22%), in polyploid species via various types of translocations compared to their diploid progenitors. However, no translocation was found between the relatively small St and Y chromosomes. Environmental factors may affect rearrangements among the three genomes. Chromosome translocations were significantly more frequent in populations from cold alpine and grassland environments than in populations from valley and lake-basin habitats (P
ISSN:1932-6203
1932-6203
DOI:10.1371/journal.pone.0031033