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| Web URL(s): | http://turf.rutgers.edu/research/abstracts/symposium2008.pdf
Last checked: 11/05/2015
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| Publication Type:
| Report |
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| Content Type: | Abstract or Summary only |
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| Author(s): | Bonos, Stacy A.;
Weibel, Eric |
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| Author Affiliation: | Department of Plant Biology and Pathology, Rutgers University, New Brunswick, New Jersey |
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| Title: | Gene action of dollar spot resistance in creeping bentgrass as affected by isolate and host genotype |
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| Section: | Poster presentations
Other records with the "Poster presentations" Section
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| Meeting Info.: | New Brunswick, NJ: January 10-11, 2008 |
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| Source: | Proceedings of the Seventeenth Annual Rutgers TurfgrassSymposium. 2008, p. 38. |
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| Publishing Information: | New Brunswick, NJ: Center for Turfgrass Science, Cook College, Rutgers, The State University of New Jersey |
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| # of Pages: | 1 |
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| Keywords: | TIC Keywords: Genetic resistance; Dollar spot; Agrostis stolonifera; Disease resistance; Sclerotinia homoeocarpa; Genotypes
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| Abstract/Contents: | "Genetic resistance to dollar spot disease incited by Sclerotinia homoeocarpa F.T. Bennett is a promising component of sound integrated disease management programs. Previous research indicates that dollar spot resistance is quantitatively inherited with no evidence of major disease resistance genes; however, the response of creeping bentgrass genotypes to different isolates has not been evaluated. The objectives of this study were to evaluate the response of creeping bentgrass crosses to three different isolates of S. homoeocarpa, evaluate disease progression, determine gene action, and identify number of loci involved in resistance to individual fungal isolates. Four hundred plants of each of three reciprocal controlled crosses were established in a field trial in a randomized complete block design in the fall of 2000 and 2002. Eight backcross and four F2 populations were also included in the 2002 trial. One hundred progeny of each cross were inoculated with one of three isolates (identified as 'Crenshaw', 'PRG', and 'S9') of S. homoeocarpa, or a mixture of the three isolates and evaluated for dollar spot disease. Mid-parent heterosis and minimum number of loci calculations were determined from the crosses. Generation mean analysis was conducted on six generations for each cross using SAS Quant (Gusmini et al., 2007). This analysis is used to determine gene effects. This is the first study conducted on dollar spot disease progression of progeny from resistant x susceptible crosses inoculated with different fungal isolates. The degree of dollar spot disease differed depending on the cross and the isolate evaluated. The Crenshaw isolate (isolated from creeping bentgrass) was more virulent on creeping bentgrass in both years when compared to other isolates including one isolated from perennial ryegrass (PRG). Minimum loci calculations differed depending on the cross and the isolate. Most crosses estimated approximately 2 genes and none of the crosses estimated more than six genes. Mid-parent heterosis calculations were not significant indicating an additive type of gene action. Backcross populations were skewed towards the recurrent parent regardless of resistance or susceptibility. Generation mean analysis support additive gene action across different isolates. Although, there was some evidence to support dominant effects for susceptibility to the Crenshaw isolate. There were no completely resistant phenotypes, and no indication of major genes interacting with the individual isolates. These results support previous research that dollar spot disease is quantitatively inherited and indicate that there may be a few genes interacting in an additive fashion to confer dollar spot disease resistance in creeping bentgrass." |
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| Language: | English |
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| References: | 1 |
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| Note: | This item is an abstract only! |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Bonos, S. A., and E. Weibel. 2008. Gene action of dollar spot resistance in creeping bentgrass as affected by isolate and host genotype. Proc. Annu. Rutgers Turfgrass Symp. p. 38. |
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| Web URL(s):
http://turf.rutgers.edu/research/abstracts/symposium2008.pdf
Last checked: 11/05/2015
Requires: PDF Reader
Notes: Item is within a single large file |
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MSU catalog number: SB 433 .R88 |
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