The genetic relationship between barley leaf rust resistance genes located on chromosome 2HS

Four seedling leaf rust resistance genes ( Rph14 , Rph15 , Rph16 and Rph17 ) described in barley are located on chromosome 2HS. A fifth, present in barley accession HOR 1063, was reported to map to the same region as Rph16 . A comprehensive analysis of the allelic relationship between Rph14 , Rph15...

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Bibliographic Details
Published in:Euphytica 2015-05, Vol.203 (1), p.211-220
Main Authors: Derevnina, L., Singh, D., Park, R. F.
Format: Article
Language:English
Subjects:
Analysis
Barley
Biomedical and Life Sciences
Biotechnology
Chromosomes
Genes
Genotype & phenotype
Hordeum vulgare
Life Sciences
Plant Genetics and Genomics
Plant Pathology
Plant Physiology
Plant resistance
Plant Sciences
Puccinia hordei
Selective breeding
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Summary:Four seedling leaf rust resistance genes ( Rph14 , Rph15 , Rph16 and Rph17 ) described in barley are located on chromosome 2HS. A fifth, present in barley accession HOR 1063, was reported to map to the same region as Rph16 . A comprehensive analysis of the allelic relationship between Rph14 , Rph15 , Rph17 and RphHOR1063 was undertaken. Two additional genotypes (HOR 15560 and Zhu 4) that were initially thought to carry Rph16 were also included. While no segregation was observed in F 2 populations derived from crosses between PI 584760 (carrying Rph14 ), PI 355447 (carrying Rph15 ), Zhu 4 and HOR 1063, the lines did exhibit differential reactions across 10 Australian Puccinia hordei pathotypes. This suggests that the Rph14 locus may be complex. An evaluation of F 3 populations confirmed that resistance genes in Zhu 4 and in HOR 1063 were allelic to both Rph14 and Rph15 , however A susceptible line was found among F 3 progeny of the cross PI 584760/PI 355447, suggesting that Rph14 and Rph15 may be independent. Rph17 and the gene present in HOR 15560 were shown to be independent of each other and of Rph14 and Rph15 . The response of HOR 15560 across an array of P. hordei pathotypes revealed that it possesses the same specificity as Rph1. Because the resistance in Zhu 4 and HOR 1063 were shown to be allelic to Rph14 , they should be designated Rph14.am and Rph14.an , respectively.
ISSN:0014-2336
1573-5060
DOI:10.1007/s10681-014-1315-x