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GrainGenes Reference Report: CRS-41-1771

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Reference	CRS-41-1771
Title	Deletion mapping of a nematode resistance gene on rye chromosome 6R in wheat
Journal	Crop Science
Year	2001
Volume	41
Pages	1771-1778
Author	Dundas IS Frappell DE Crack DM Fisher JM
Abstract	Summary: Four deletion mutants of rye chromosome 6R were identified in progeny of wheat (Triticum aestivum L.) lines of ph1bph1b genotype and monosomic for chromosome 6R. The rye chromosome carried a resistance gene against the cereal cyst nematode (CCN) (Heterodera avenae Woll.) and this chromosome originated in triticale line T-701 (X Triticosecale Witt.). The deletion mutants were selected on the basis of dissociation of three isozyme loci on the long arm of the rye (Secale cereale L.) chromosome. Three plants and their progeny showed expression of the rye genes alpha-Amy-R1 and Got-R2 but lacked the gene PgdR2. The other plant and its progeny showed expression of the alpha-Amy-R1 gene while the genes Got-R2 and PgdR2 were absent. The four deletion chromosomes displayed long-arm terminal deficiencies of different sizes which enabled mapping of the rye isozyme genes and the CCN resistance gene. The distal to proximal order of the 6R isozyme loci was found to be: PgdR2, Got-R2, and then alpha-Amy-R1. Bioassay tests demonstrated that the CCN resistance gene (CreR) was located on an interstitial section of the long arm of 6R adjacent to Got-R2
Keyword	[ Hide all but 1 of 43 ] 6-phosphogluconate dehydrogenase arm 1rs avena bioassay cereal cyst nematode common wheat controlled introgression crop cyst-nematode deficiency deletion deletion mapping dissociation gene genome genotype heterodera induction isozyme isozyme loci locus long arm mapping nematode nematode resistance nematode resistance gene order progeny recombinants resistance resistance gene rich regions rye secale secale cereale sizes terminal deficiencies triticale triticosecale triticum triticum aestivum woll x triticosecale

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