Origin of leaf rust adult plant resistance gene Rph20 in barley

Hickey, Lee T., Lawson, Wendy, Platz, Greg J., Dieters, Mark and Franckowiak, Jerome (2012) Origin of leaf rust adult plant resistance gene Rph20 in barley. Genome, 55 5: 396-399. doi:10.1139/G2012-022


Author Hickey, Lee T.
Lawson, Wendy
Platz, Greg J.
Dieters, Mark
Franckowiak, Jerome
Title Origin of leaf rust adult plant resistance gene Rph20 in barley
Formatted title
Origin of leaf rust adult plant resistance gene Rph20 in barley
Journal name Genome   Check publisher's open access policy
ISSN 0831-2796
1480-3321
Publication date 2012-05
Sub-type Article (original research)
DOI 10.1139/G2012-022
Volume 55
Issue 5
Start page 396
End page 399
Total pages 4
Place of publication Ottawa, ON, Canada
Publisher N R C Research Press
Collection year 2013
Language eng
Formatted abstract
Rph20 is the only reported, simply inherited gene conferring moderate to high levels of adult plant resistance (APR) to leaf rust (Puccinia hordei Otth) in barley (Hordeum vulgare L.). Key parental genotypes were examined to determine the origin of Rph20 in two-rowed barley. The Dutch cultivar ‘Vada’ (released in the 1950s) and parents, ‘Hordeum laevigatum’ and ‘Gull’ (‘Gold’), along with the related cultivar ‘Emir’ (a derivative of ‘Delta’), were assessed for APR to P. hordei in a disease screening nursery. The marker bPb-0837-PCR, co-located with Rph20 on the short arm of chromosome 5H (5HS), was used to screen genotypes for the resistance allele, Rph20.ai. Results from phenotypic assessment and DNA analysis confirmed that Rph20 originated from the landrace ‘H. laevigatum’ (i.e., Hordeum vulgare subsp. vulgare). Tracing back this gene through the pedigrees of two-rowed barley cultivars, indicated that Rph20 has contributed APR to P. hordei for more than 60 years. Although there have been no reports of an Rph20-virulent pathotype, the search for alternative sources of APR should continue to avoid widespread reliance upon a single resistance factor.
Keyword Puccinia hordei Otth
Partial resistance
Durable resistance
Breeding
Marker-assisted selection
Hordeum vulgare L.
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Agriculture and Food Sciences
Official 2013 Collection
 
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