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ARS Home » Southeast Area » Stuttgart, Arkansas » Dale Bumpers National Rice Research Center » Research » Publications at this Location » Publication #416979
Research Project: Broadening and Strengthening the Genetic Base of Rice for Adaptation to a Changing Climate, Crop Production Systems, and Markets

Location: Dale Bumpers National Rice Research Center

Title: Registration of three long grain rice germplasm lines with improved blast resistance with the Ptr gene, low chalk, excellent milling quality, and good yield

Author
item Jia, Yulin
item GIBBONS, JAMES - Retired Non ARS Employee
item Jackson, Aaron
item Dunlap, Heather
item ZHAO, HAIJUN - Former ARS Employee
item WANG, XUEYAN - University Of Arkansas
item Jia, Melissa
item FOMOSO, ADAM - Louisiana State University Agcenter
item GROTH, DON - Louisiana State University Agcenter

Submitted to: Journal of Plant Registrations
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 10/18/2024
Publication Date: N/A
Citation: N/A

Interpretive Summary: Blast disease of rice is one of the most fearful diseases globally. Blast disease is effectively managed by using major blast resistance genes. The major blast resistance gene Ptr gene is an atypical blast resistance gene that confers resistance to a wide range of blast races. Here we report that three blast rice (Oryza sativa L.) germplasm lines, designated as CS272, CS324, CS353 were selected from a cross of the U.S.-adapted cultivars ‘Cybonnet’ (PI 636726) and ‘Saber’ (PI 633624). These Cybonnet–Saber (CS) RILs were officially released by the USDA-ARS and the University of Arkansas Agricultural Experiment Station in cooperation with Louisiana State University, Crowley, LA. The RILs were resistant to most blast races as determined in inoculated greenhouse tests, resistant to leaf blast when tested in an upland blast nursery in Crowley LA, and resistant to panicle blast under flood conditions in Puerto Rico and Crowley. These CS RILs contain Ptr identified on chromosome 12 originating from the Cybonnet parent. These three CS RILs are superior in panicle size and have many agronomic and grain-quality characteristics comparable to or better than those of both parents. The CS RILs can be used in rice-breeding programs for improving blast resistance, quality, and yield.

Technical Abstract: Rice Blast disease caused by the fungus Magnaporthe oryzae B.C. Couch is the most threatening disease of rice worldwide. Three rice (Oryza sativa L.) germplasm lines, designated as CS272., CS324, CS353 were selected from among nine hundred recombinant inbred lines (RILs) derived from a cross of the U.S.-adapted cultivars ‘Cybonnet’ (PI 636726) and ‘Saber’ (PI 633624). These Cybonnet–Saber (CS) RILs were officially released by the USDA-ARS and the University of Arkansas Agricultural Experiment Station in cooperation with Louisiana State University, Crowley, LA. These three RILs have resistance to blast as determined under greenhouse conditions, and uninoculated field trials conducted in Puerto Rico in 2017 and Crowley, LA in 2018 and 2019. The RILs were resistant to most blast races as determined in inoculated greenhouse tests, resistant to leaf blast when tested in an upland blast nursery in Crowley LA, and resistant to panicle blast under flood conditions in Puerto Rico and Crowley. These CS RILs contain the major blast resistance gene Ptr identified on chromosome 12 originating from the Cybonnet parent. These three CS RILs are superior in panicle size and have many agronomic and grain-quality characteristics comparable to or better than those of both parents. The CS RILs can be used in rice-breeding programs for improving blast resistance, quality and yield.