Submitted to: Journal of Plant Registrations
Publication Type: Peer reviewed journal
Publication Acceptance Date: 6/6/2008
Publication Date: 8/1/2008
Citation: Pinson, S.R., Oard, J.H., Groth, D., Miller, R., Jia, M.H., Jia, Y., Fjellstrom, R.G., Mackill, D., Li, Z. 2008. Registration of TIL:455, TIL:514, and TIL:642, three rice germplasm lines containing introgressed sheath blight resistance alleles. Journal of Plant Registrations. 2(3):251-254. Interpretive Summary: This is a Germplasm Release, no Interpretive Summary is required.
Technical Abstract: There are no genes known to provide complete resistance to rice sheath blight (SB) disease, caused by the fungal pathogen Rhizoctonia solani Kuhn. To create rice varieties resistant to this disease, breeders must combine several genes with small individual impact. Two of the most SB resistant rice cultivars in the USA today are Jasmine 85 developed in the Philippines, and TeQing developed in China. Previous QTL-mapping studies identified 18 SB QTLs in TeQing, three in Lemont, a prevalent rice variety in the US in the 1980s. Saber, a recent US rice variety with TeQing as an ancestor, is moderately resistant to sheath blight and molecular data indicate that it contains three SB QTLs from TeQing. Three germplasm lines are being made available to breeders that possess six new SB resistance QTLs derived from TeQing. Up to five TeQing SB QTLs were introgressed into the three lines using a backcross breeding program with Lemont as the recurrent parent. One of these newly introgressed TeQing QTLs appears to confer resistance as good as or better than that exhibited by Saber.