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| Web URL(s): | http://usgatero.msu.edu/v06/n02.pdf
Last checked: 02/07/2007
Requires: PDF Reader |
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| Publication Type:
| Report |
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| Author(s): | Jung, Geunhwa;
Curley, Joe;
Jo, Young-Ki |
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| Author Affiliation: | Jung: Assistant Professor; Jo: Post-Doctoral Associate, Department of Plant, Soil, and Insect Sciences, University of Massachusetts, Amherst, Massachusetts; Curley: Post-Doctoral Associate, Department of Crop Sciences, University of Illinois, Urbana, Illinois |
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| Title: | A genetic roadmap for breeding perennial ryegrass resistant to gray leaf spot |
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| Source: | USGA Turfgrass and Environmental Research Online. Vol. 6, No. 2, January 15 2007, p. [1-7]. |
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| Publishing Information: | Far Hills, NJ: United States Golf Association, Green Section |
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| # of Pages: | 9 |
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| Keywords: | TIC Keywords: Breeding; Lolium perenne; Disease resistance; Genetic resistance; Gray leaf spot; Genetic markers; Breeding improvement; Lolium multiflorum; Hybrids
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| Abstract/Contents: | "The fungus Magnaporthe grisea infects more than 50 graminaceous plants, as well as turfgrasses. This fungus causes blast on rice and gray leaf spot (GLS) on turfgrass. GLS has become an important disease on cool-season turfgrasses recently with destructive outbreaks on prennial ryegrass (Lolium perenne) occuring on golf courses and athletic fields in the Midwest and New England. Little is known about GLS resistance in perennial ryegrass, while a vast amount of genetic information about rice blast resistance in rice is available. In recent greenhouse evaluations, our lab identified, partial GLS resistance in hybrids between annual and perennial ryegrass and found genetic markers (road signs) associated with the resistant traits on a ryegrass genetic roadmap. Knowing the genetics of the partial GLS resistance will allow the improvement of perennial ryegrass through breeding. Plant breeding is a long integrated process which is accomplished by identifying, transferring, and fixing useful genes of interest (e.g., disease resistance) in elite cultivars. The genetic marker-assisted selection (MAS) can compliment the breeding process, which is conventionally based on visible phenotypic characteristics (i.e., appearance). MAS, on the other hand, is based on DNA fingerprinting, which facilitates the selection of traits of interest in individual plants for the next round of breeding. MAS improves the accuracy of selction and speeds the selection process by identifying plants with traits of interest at an earlier age. Therefore, genetic markers developed for GLS resistance in our study will significantly benefit turfgrass growers and practitioners in the U.S. This will eventually be very helpful in reducing dependence on costly fungicide applications for GLS. In brief, here are key research results. A high-density genetic roadmap of ryegrass was developed. Four partial GLS-resistance genes were detected in annual x perennial ryegrass hybrids. The partial resistance is thought to be much more durable, although partial resistance is generally more difficult to manipulate using conventional breeding methods. The source of the GLS resistance appeared to originate from annual ryegrass cv. 'Floregon' since all perennial ryegrass plants tested, including grandparents, were very susceptible to GLS. The resistance to the ryegrass isolates and the rice isolate appeared to be controlled by the different resistance genes. Some of the GLS resistance genes in ryegrass appeared similar to blast resistance genes in rice. Genetic markers tightly linked to the GLS resistance genes in the ryegrass hybrids were developed. |
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| Language: | English |
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| References: | 17 |
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| See Also: | Other Reports from this USGA research project: 2003-18-259 |
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| Note: | Summary as abstract
Pictures, color
Figures
Graphs |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Jung, G., J. Curley, and Y.-K. Jo. 2007. A genetic roadmap for breeding perennial ryegrass resistant to gray leaf spot. USGA Turfgrass Environ. Res. Online. 6(2):p. [1-7]. |
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| Web URL(s):
http://usgatero.msu.edu/v06/n02.pdf
Last checked: 02/07/2007
Requires: PDF Reader |
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MSU catalog number: SB 433 .A1 A65 [online] |
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