Document Detail

Structural and functional organization of the '1S0.8 gene-rich region' in the Triticeae.
MedLine Citation:
PMID:  11999850     Owner:  NLM     Status:  MEDLINE    
Wheat genes are present in physically small, gene-rich regions, interspersed by gene-poor blocks of retrotransposon-like repetitive sequences. One of the largest gene-rich regions is present around fraction length (FL) 0.8 of the short arm of wheat homoeologous group 1 chromosomes and is called '1S0.8 region'. The objective of this study was to reveal the structural and functional organization of the '1S0.8 region' in various Triticeae and other Poaceae species. Consensus genetic linkage maps of the '1S0.8 region' were constructed for wheat, barley, and rye by combining mapping information from 16, 11, and 12 genetic linkage maps, respectively. The consensus genetic linkage maps were compared with each other and with a consensus physical map of wheat homoeologous group 1. Comparative analyses localized 75 agronomically important genes to the '1S0.8 region'. This high-resolution comparison revealed exceptions to the rule of conserved gene synteny, established using low-resolution marker comparisons. Small rearrangements such as duplications, deletions, and inversions were observed among species. Proportion ofchromosomal recombination occurring in the '1S0.8 region' was very similar among species. Within the gene-rich region, the extent of recombination was highly variable but the pattern was similar among species. Relative recombination among markers was similar except for a few loci where drastic differences were observed among species. Chromosomal rearrangements did not always change the extent of recombination for the region. Differences in gene order and relative recombination were the least between wheat and barley, and were the highest between wheat and oat.
Devinder Sandhu; Kulvinder S Gill
Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Plant molecular biology     Volume:  48     ISSN:  0167-4412     ISO Abbreviation:  Plant Mol. Biol.     Publication Date:    2002 Mar-Apr
Date Detail:
Created Date:  2002-05-09     Completed Date:  2002-06-20     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  9106343     Medline TA:  Plant Mol Biol     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  791-804     Citation Subset:  IM    
Department of Agronomy and Horticulture, University of Nebraska-Lincoln, 68583-0915, USA.
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MeSH Terms
Chromosome Mapping
Chromosomes / genetics,  physiology
DNA, Plant / genetics*,  physiology
Genes, Plant / genetics
Genome, Plant
Hordeum / genetics
Recombination, Genetic
Secale cereale / genetics
Triticum / genetics*
Reg. No./Substance:
0/DNA, Plant

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