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| Web URL(s): | http://turf.rutgers.edu/research/abstracts/symposium2008.pdf
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| Publication Type:
| Report |
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| Content Type: | Abstract or Summary only |
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| Author(s): | Rotter, David;
Amundsen, Keenan;
Bonos, Stacy A.;
Meyer, William A.;
Warnke, Scott;
Belanger, Faith C. |
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| Author Affiliation: | Rotter, Bonos, Meyer, and Belanger: Department of Plant Biology and Pathology, Rutgers University, New Brunswick, New Jersey; Amundsen and Warnke: United States Department of Agriculture, Beltsville, Maryland |
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| Title: | A genomics approach to understanding dollar spot resistance in colonial bentgrass |
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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. 55-56. |
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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: | 2 |
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| Keywords: | TIC Keywords: Dollar spot; Disease resistance; Agrostis tenuis; Breeding improvement; Agrostis stolonifera; Gene mapping; Genetics; Genomes
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| Cultivar Names: | Agrostis canina |
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| Abstract/Contents: | "Improvement in dollar spot resistance is one of the main objectives in current creeping bentgrass breeding programs. Colonial bentgrass has good resistance to dollar spot therefore may be a source of novel genes or alleles that could be used for genetic improvement of creeping bentgrass (Belanger et al., 2003, 2004, 2005a,b). We have a population of plants generated by crossing a dollar spot resistant interspecific hybrid with a creeping bentgrass plant in which some of the progeny have excellent dollar spot resistance, which is originating from colonial bentgrass. We are focused on trying to identify the genetic basis of dollar spot resistance in colonial bentgrass using this backcross population. Our approach is to generate a genetic linkage map of colonial bentgrass. To do this we have developed a new approach to mapping genes (Rotter et al., 2007a) using our colonial and creeping EST sequences (Rotter et al., 2007b). Our current colonial bentgrass genetic linkage map covers 1161 cM and consists of the expected 14 linkage groups, 7 for the A1 genome and 7 for the A2 genome. Of particular significance is that we can now make assignments of each linkage group to either A1 or A2 genome. the linkage group assignments are based on the wheat chromosome designations since colonial bentgrass and wheat are both members of the Pooideae and both have a base chromosome number of 7. Although there are numerous exceptions, the wheat chromosomes are largely derived from specific rice chromosomal regions (LaRota and Sorrells, 2005). We used the rice-wheat chromosomal relationships to mkae the linkage group assignments. In general, the rice/wheat relationship is conserved in the colonial bentgrass linkage groups, making the linkage group assignments simple. Making these linkage group assignments is of considerable practical utility for any future efforts at fine mapping to narrow genomic regions of interest identified from QTL or other analyses. The mapping population has been field tested for dollar spot resistance. Overall, about 15% exhibited resistance. This number suggests there may be 3 colonial bentgrass genes needed to confer dollar spot resistance. This is a reasonable number of genes to permit marker assisted breeding in the future. Our current hypothesis is that all 3 proposed genes are required for resistance and that the effect is qualitative rather than quantitative. We therefore compared the genome compositions of the resistance plants looking for colonial bentgrass markers that are found in all the resistant plants. This analysis revealed 2 large regions on linkage groups 2A1 and 3A1 that were consistently found in resistant plants. These regions may therefore contain the 3 proposed colonial bentgrass genes responsible for dollar spot resistance. It is interesting that these regions are in the A1 genome. The diploid species velvet bentgrass (A. canina) is considered to be the origin of the A1 genome in colonial bentgrass (Jones, 1956) and it also has good resistance to dollar spot. We are currently trying to map more genes in these areas in order to narrow down the region of interest." |
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| Language: | English |
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| References: | 8 |
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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):
Rotter, D., K. Amundsen, S. A. Bonos, W. A. Meyer, S. Warnke, and F. C. Belanger. 2008. A genomics approach to understanding dollar spot resistance in colonial bentgrass. Proc. Annu. Rutgers Turfgrass Symp. p. 55-56. |
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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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