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ARS Home » Southeast Area » Stuttgart, Arkansas » Dale Bumpers National Rice Research Center » Research » Publications at this Location » Publication #413692
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: Identification of blast resistance QTLs in black hull awn weedy rice (RR14) and Aus-196 rice variety

Author
item OSAKINA, ARON - Washington University
item OLSEN, KENNETH - Washington University
item Jia, Yulin

Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: 5/15/2024
Publication Date: 7/27/2024
Citation: Osakina, A., Olsen, K., Jia, Y. 2024. Identification of blast resistance QTLs in black hull awn weedy rice (RR14) and Aus-196 rice variety. Abstract. Plant Health 2024, July 27-30, 2024. Memphis, Tennessee.

Interpretive Summary:

Technical Abstract: Rice blast caused by the ascomycete fungus Magnaporthe oryzae, is the most devastating disease in areas where rice cultivation occurs. The disease is estimated to account to about 10-10% annual losses in rice production in rice-growing regions globally. Since rice supplies more than one-third of humanity’s calories, its losses due to blast pandemic continues to be a worrying trend as it poses great concern to food security for the ever-increasing human population. Blast mitigation strategy is therefore urgently required. An efficient and effective way to control blast disease is through discovery and deployment of resistance genes. Although numerous resistance QTLs against blast disease have been identified, many resistance QTLs remaining unknown, and their continued discovery is therefore of paramount importance. In this study we accessed disease scores of 183 F5 and F6 recombinant inbred line mapping population and their respective parental lines the Black Hull Awn weedy rice (RR14) and AUS-196 rice variety using five blast races IB33, IB49, IG1, IE1K and ICI7 under greenhouse conditions. Except for the race IB49 both the parental lines were resistant to 4 blast races used. The mapping population were then genotyped by genotyping by sequencing (GBS), and a linkage map of 3066.1 centimorgan was constructed using inclusive composite interval mapping software. A total of 24 resistance QTLs were mapped including the major effect QTL on chromosome 12 and several other minor QTLs on chromosomes 4, 5, 7, 9 and 11. These findings are useful for the development of blast resistant rice varieties using a marker-assisted selection approach.