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Sheath-blight resistance QTLS in japonica rice germplasm |
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| Authors: | J C Nelson J H Oard D Groth H S Utomo Y Jia G Liu K A K Moldenhauer F J Correa-Victoria R G Fjellstrom B Scheffler G A Prado |
| Institution: | 1. Department of Plant Pathology, Kansas State University, 4024 Throckmorton Plant Sciences Center, Manhattan, KS, 66506, USA 2. School of Plant, Environmental, and Soil Sciences, Louisiana State University, 104 Sturgis Hall, Baton Rouge, LA, 70803, USA 3. Rice Research Station, Louisiana State University AgCenter, 1373 Caffey Road, Rayne, LA, 70578, USA 4. U. S. Department of Agriculture, Agricultural Research Service, Dale Bumpers National Rice Research Center, Stuttgart, AR, 72160, USA 5. Division of Agriculture Rice Research & Extension Center, University of Arkansas, 2900 Hwy 130 E., Stuttgart, AR, 72160, USA 6. RiceTec, Inc., P. O. Box 1305, Alvin, TX, 77573, USA 7. U. S. Department of Agriculture, Agricultural Research Service, Genomics and Bioinformatics Research Unit, Stoneville, MS, 38776?C0038, USA 8. International Center for Tropical Agriculture (CIAT), 6713, Cali, Colombia |
| Abstract: | Sheath blight (SB), caused by Rhizoctonia solani, is a serious disease of cultivated rice (Oryza sativa L.) for which genetic resistance is in demand by breeders. With the goal of resistance (SBR)-QTL discovery in U. S. japonica breeding material, 197 doubled-haploid lines from a cross between MCR10277 (resistant) and Cocodrie (susceptible) were evaluated in field and greenhouse assays with U. S. and Colombian pathogen isolates and genotyped at 111 microsatellite marker loci. Four SBR QTLs from MCR10277 were identified, together accounting for 47% of field genetic variation. In all trials the strongest effect was provided by a chromosome-9 QTL, qsbr_9.1, but some QTLs differed for U. S. and Colombian R. solani isolates. SBR QTLs coincided with only two of several height or heading-time QTLs, suggesting that the relationship between these developmental traits and SBR is not simple. For the U. S. isolates, a microchamber greenhouse assay revealed the same QTLs as did field inoculation. |
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