NDLI: Genetically engineered stem rust resistance in barley using the Rpg1 gene

Content Provider	PubMed Central
Author	Horvath, Henriette Rostoks, Nils Brueggeman, Robert Steffenson, Brian Wettstein, Diter Von Kleinhofs, Andris
Copyright Year	2003
Abstract	The stem-rust-susceptible barley cv. Golden Promise was transformed by Agrobacterium-mediated transformation of immature zygotic embryos with the Rpg1 genomic clone of cv. Morex containing a 520-bp 5′ promoter region, 4,919-bp gene region, and 547-bp 3′ nontranscribed sequence. Representatives of 42 transgenic barley lines obtained were characterized for their seedling infection response to pathotype Pgt-MCC of the stem rust fungus Puccinia graminis f. sp. tritici. Golden Promise was converted from a highly susceptible cultivar into a highly resistant one by transformation with the dominant Rpg1 gene. A single copy of the gene was sufficient to confer resistance against stem rust, and progenies from several transformants segregated in a 3:1 ratio for resistance/susceptibility as expected for Mendelian inheritance. These results unequivocally demonstrate that the DNA segment isolated by map-based cloning is the functional Rpg1 gene for stem rust, resistance. One of the remarkable aspects about the transformants is that they exhibit a higher level of resistance than the original sources of Rpg1 (cvs. Chevron and Peatland). In most cases, the Golden Promise transformants exhibited a highly resistant reaction where no visible sign of infection was evident. Hypersensitive necrotic “fleck” reactions were also observed, but less frequently. With both infection types, pathogen sporulation was prevented. Southern blot and RT-PCR analysis revealed that neither Rpg1 gene copy number nor expression levels could account for the increased resistance observed in Golden Promise transformants. Nevertheless, this research demonstrates that stem-rust-susceptible barley can be made resistant by transformation with the cloned Rpg1 gene.
Related Links	http://dx.doi.org/10.1073/pnas.0136911100
Ending Page	369
Page Count	6
Starting Page	364
File Format	PDF
ISSN	00278424
e-ISSN	10916490
Journal	Proceedings of the National Academy of Sciences of the United States of America
Issue Number	1
Volume Number	100
Language	English
Publisher	The National Academy of Sciences
Publisher Date	2003-01-07
Access Restriction	Open
Rights Holder	The National Academy of Sciences
Subject Keyword	General Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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