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GERMPLASM

Registration of TIL:455, TIL:514, and TIL:642, Three Rice Germplasm Lines Containing Introgressed Sheath Blight Resistance Alleles

^a USDA-ARS Rice Research Unit, 1509 Aggie Dr., Beaumont, TX 77713
^b LSU AgCenter, Agronomy Dep., Baton Rouge, LA 70803
^c LSU AgCenter, 1373 Caffey Road, Rayne, LA 70578
^d RiceTec, Inc., P.O. Box 1305, Alvin, TX 77512
^e USDA-ARS-DBNNRC, P.O. Box 287, Stuttgart, AR 72160
^f IRRI and Chinese Academy of Agricultural Sciences, Institute of Crop Sciences, Beijing, 100081, China. Mention of a trademark or proprietary product does not constitute a guarantee or warranty of the product by the U.S. Department of Agriculture and does not imply its approval to the exclusion of other products that also can be suitable

^* Corresponding author (shannon.pinson{at}ars.usda.gov).

ABSTRACT

Three rice (Oryza sativa L.) germplasm lines designated as TIL:455 (Reg. No. GP-112, PI 642943), TIL:514 (Reg. No. GP-113, PI 642944), and TIL:642 (Reg. No. GP-114, PI 642945) contain a total of eight novel alleles with sheath blight (caused by Rhizoctonia solani Kühn) resistance backcrossed into an elite U.S. rice genetic background having good grain quality traits, early maturity, and glabrous leaves and hulls. These three germplasm lines were jointly released in 2007 by the USDA-ARS, the Louisiana State University Agricultural Center, and the International Rice Research Institute. The novel sheath blight resistance alleles contained in these lines originated from ‘TeQing’ (PI 536047), a high-yielding rice cultivar from China that is well known in the United States for its strong resistance to sheath blight disease. With the aim of identifying improved germplasm suitable for introducing novel sheath blight resistance alleles into tropical japonica breeding programs, a combination of phenotypic and molecular data was used to select three lines from among 262 random backcross introgression lines.

Abbreviations: IRRI, International Rice Research Institute • LSU AgCenter, Louisiana State University Agricultural Center • QTL, quantitative trait locus • RFLP, restriction fragment length polymorphism • SB, sheath blight • SBR, sheath blight resistance • SSR, simple sequence repeat • TIL, TeQing-into-Lemont introgression line