Structural and functional organization of the '1S0.8 gene-rich region' in the Triticeae

Structural and functional organization of the '1S0.8 gene-rich region' in the Triticeae 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 of chromosomal 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. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Plant Molecular Biology Springer Journals

Structural and functional organization of the '1S0.8 gene-rich region' in the Triticeae

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Publisher
Kluwer Academic Publishers
Copyright
Copyright © 2002 by Kluwer Academic Publishers
Subject
Life Sciences; Biochemistry, general; Plant Sciences; Plant Pathology
ISSN
0167-4412
eISSN
1573-5028
D.O.I.
10.1023/A:1014876409166
Publisher site
See Article on Publisher Site

Abstract

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 of chromosomal 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.

Journal

Plant Molecular BiologySpringer Journals

Published: Oct 13, 2004

References

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