Submitted to: Phytopathology
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 8/18/1995
Publication Date: N/A
Interpretive Summary: Stripe rust of wheat is especially destructive in the western United States. The most economical and environmentally safer method of controlling the disease is growing resistant varieties. Winter wheat varieties Heines VII, Clement, Moro, Tres, and Daws each have two genes and Tyee has one gene for stripe rust resistance. To determine the chromosomal locations of these genes, the six varieties were crossed with the normal Chinese Spring that has 42 chromosomes and a complete set of Chinese Spring lines with one chromosome or one chromosome plus a chromosome arm missing. Based on cytogenetic analyses, the two genes in Heines VII are located on chromosomes 4A and 7B; the two genes in Clement are located on chromosomes 1B and 4B; the two genes in Moro are located on chromosomes 1B and 4B; the two genes in Tres are located on chromosomes 3A and 6D; the two genes in Daws are located on chromosomes 1A and 5D; and the gene in Tyee is located on chromosome 6D. The information is useful in breeding resistant varieties and in understanding the interactions of wheat varieties and stripe rust races.
Technical Abstract: Winter wheat (Triticum aestivum L.) cultivars Heines VII, Clement, Moro, Tyee, Tres, and Daws have been reported to have genes Yr2 and YrHVII, Yr9 and YrCle, Yr10 and YrMor, YrTye, YrTr1 and YrTr2, and YrDa1 and YrDa2, respectively, for resistance to Puccinia striiformis West., the causal agent of stripe rust. To determine the chromosomal locations of the genes, the six cultivars were crossed with disomic Chinese Spring and a set of 21 monotelosomic or monosomic Chinese Spring lines. Somatic chromosome number in parental, F1, and some F2 plants were determined in Feulgen stained root tip cells. The monosomic F1 plants were selfed to produce F2 seeds. F2 and parental seedlings were tested under controlled conditions with North American races of P. striiformis. The results confirm that Yr2 is on chromosome 7B and Yr9 and Yr10 are on chromosome 1B, and show that YrHVII is on chromosome 4A; YrCle and YrMor are on chromosome 4B; YrTye and YrTr1 are on chromosome 6D; YrTr2 is on chromosome 3A; YrDa1 is on chromosome 1A; and YrDa2 is on chromosome 5D.