GEPHE SUMMARY Print
Gephebase Gene
Entry Status
Published
GepheID
GP00000551
Main curator
Courtier
PHENOTYPIC CHANGE
Trait Category
Trait State in Taxon A
Triticum aestivum - Wichita
Trait State in Taxon B
Triticum aestivum - Fielder
Ancestral State
Data not curated
Taxonomic Status
Taxon A
Common Name
bread wheat
Synonyms
Triticum aestivum subsp. aestivum; Triticum vulgare; bread wheat; Canadian hard winter wheat; common wheat; wheat; Triticum aestivum L.; Triticum vulgare L.; Triticum vulgare Vill., nom. illeg.; Tricum aestivum; Triticum aestivam; Triticum aestivum8
Rank
species
Lineage
Show more ... a; Tracheophyta; Euphyllophyta; Spermatophyta; Magnoliophyta; Mesangiospermae; Liliopsida; Petrosaviidae; commelinids; Poales; Poaceae; BOP clade; Pooideae; Triticodae; Triticeae; Triticinae; Triticum
NCBI Taxonomy ID
is Taxon A an Infraspecies?
Yes
Taxon A Description
Triticum aestivum - Wichita
Taxon B
Common Name
bread wheat
Synonyms
Triticum aestivum subsp. aestivum; Triticum vulgare; bread wheat; Canadian hard winter wheat; common wheat; wheat; Triticum aestivum L.; Triticum vulgare L.; Triticum vulgare Vill., nom. illeg.; Tricum aestivum; Triticum aestivam; Triticum aestivum8
Rank
species
Lineage
Show more ... a; Tracheophyta; Euphyllophyta; Spermatophyta; Magnoliophyta; Mesangiospermae; Liliopsida; Petrosaviidae; commelinids; Poales; Poaceae; BOP clade; Pooideae; Triticodae; Triticeae; Triticinae; Triticum
NCBI Taxonomy ID
is Taxon B an Infraspecies?
Yes
Taxon B Description
Triticum aestivum - Fielder
GENOTYPIC CHANGE
Generic Gene Name
-
Synonyms
-
String
-
Sequence Similarities
Belongs to the disease resistance NB-LRR family.
GO - Biological Process
-
UniProtKB
Triticum aestivum
GenebankID or UniProtKB
Presumptive Null
No
Molecular Type
Aberration Type
Molecular Details of the Mutation
Novel pathogen specificity resulting from chimerism of the parental alleles after intragenic recombination
Experimental Evidence
Authors
Huang L; Brooks S; Li W; Fellers J; Nelson JC; Gill B
Abstract
The wheat leaf-rust resistance gene Lr21 was first identified in an Iranian accession of goatgrass, Aegilops tauschii Coss., the D-genome donor of hexaploid bread wheat, and was introgressed into modern wheat cultivars by breeding. To elucidate the origin of the gene, we analyzed sequences of Lr21 and lr21 alleles from 24 wheat cultivars and 25 accessions of Ae. tauschii collected along the Caspian Sea in Iran and Azerbaijan. Three basic nonfunctional lr21 haplotypes, H1, H2, and H3, were identified. Lr21 was found to be a chimera of H1 and H2, which were found only in wheat. We attempted to reconstitute a functional Lr21 allele by crossing the cultivars Fielder (H1) and Wichita (H2). Rust inoculation of 5876 F(2) progeny revealed a single resistant plant that proved to carry the H1H2 haplotype, a result attributed to intragenic recombination. These findings reflect how plants balance the penalty and the necessity of a resistance gene and suggest that plants can reuse "dead" alleles to generate new disease-resistance specificity, leading to a "death-recycle" model of plant-resistance gene evolution at simple loci. We suggest that selection pressure in crop-weed complexes contributes to this process.
Additional References
RELATED GEPHE
Related Haplotypes
No matches found.
EXTERNAL LINKS
COMMENTS
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