GrainGenes Reference Report: GNM-45-963
Reference
GNM-45-963
Title
Analysis of 106 kb of contiguous DNA sequence from the D genome of wheat reveals high gene density and a complex arrangement of genes related to disease resistance
Journal
Genome
Year
2002
Volume
45
Pages
963-972
Author
Brooks SA Huang L Gill BS Fellers JP
Abstract
Summary: Vast differences exist in genome sizes of higher plants; however, gene count remains relatively constant among species. Differences observed in DNA content can be attributed to retroelement amplification leading to genome expansion. Cytological and genetic studies have demonstrated that genes are clustered in islands rather than distributed at random in the genome. Analysis of gene islands within highly repetitive genomes of plants like wheat remains largely unstudied. The objective of our work was to sequence and characterize a contiguous DNA sequence from chromosome 1DS of Aegilops tauschii. An RFLP probe that maps to the Lr21 region of 1DS was used to isolate a single BAC. The BAC was sequenced and is 106 kb in length. The contiguous DNA sequence contains a 46-kb retroelement-free gene island containing seven coding sequences. Within the gene island is a complex arrangement of resistance and defense response genes. Overall gene density in this BAC is 1 gene per 8.9 kb. This report demonstrates that wheat and its relatives do contain regions with gene densities similar to that of Arabidopsis
External Databases
Pubmed: 12416630
Keyword
GrainGenes is a product of the Agricultural Research Service of the US Department of Agriculture.
GrainGenes Reference Report: GNM-45-963
|
| |||||
|
| |||||
|
| |||||
|
| |||||
|
| |||||
|
| |||||
|
| |||||
|
| |||||
|
| |||||
|
GrainGenes is a product of the Agricultural Research Service of the US Department of Agriculture. | |||