Query (optional)   in Class  All Allele Author Colleague Collection Assembly Gene Gene Class Gene Product Germplasm Image Journal Keyword Library Locus Map Map Data Marker Pathology Polymorphism Probe Protein QTL Rearrangement Reference Sequence Species Trait Trait Study Two Point Data  

---

GrainGenes Reference Report: PHY-94-932

[Submit comment/correction]

Reference	PHY-94-932
Title	A new source of resistance to Tapesia yallundae associated with a homoeologous group 4 chromosome in Thinopyrum ponticum
Journal	Phytopathology
Year	2004
Volume	94
Pages	932-937
Author	Li HJ Arterburn A Jones SS Murray TD
Abstract	Wheat (Thinopyrum ponticum line SS767; PI 611939) with 42 chromosomes previously was identified as a new source of eyespot resistance. Individual plants of SS767 were tested for reaction to Tapesia yallundae, the major pathogen of eyespot in the Pacific Northwest region of the United States. Resistance of this line was similar to the resistant winter wheat cv. Madsen (carrying gene Pch1 for eyespot resistance). Polymerase chain reaction analysis with primers specific for the J or E genomes revealed that SS767 contains Thinopyrum chromatin. Cytological and C-banding analyses demonstrated that SS767 is a chromosome substitution line in which wheat chromosome 4D is replaced by a homoeologous group 4 chromosome of Thinopyrum ponticum. Genomic in situ hybridization using St genomic DNA from Pseudoroegneria strigosa as a probe, which can differentiate chromosomes from different genomes of Thinopyrum, indicated that this chromosome belongs to the J genome. Molecular analysis of an F(2) population segregating for chromosome 4J and resistance to eyespot confirmed that eyespot resistance in line SS767 is associated with chromosome 4J of Thinopyrum ponticum. This is the first report of genetic control of resistance to eyespot derived from Thinopyrum ponticum. This source of resistance provides a new opportunity to improve wheat resistance to eyespot by adding to the diversity of resistance sources available
Keyword	[ Hide all but 1 of 31 ] barley yellow dwarf blue kernel color cephalosporium stripe chromatin conferring resistance dasypyrum-villosum diversity dna eyespot disease gene genetic control genomic dna hybridization in situ in situ hybridization leaf-rust lines resistant molecular analysis molecular characterization pacific-northwest pathogen population primer pseudocercosporella pseudocercosporella herpotrichoides pseudoroegneria resistance substitution thinopyrum triticum aestivum winter

GrainGenes is a product of the Agricultural Research Service of the US Department of Agriculture.