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ARS Home » Southeast Area » Stuttgart, Arkansas » Dale Bumpers National Rice Research Center » Research » Publications at this Location » Publication #333680

Title: Analysis of rice blast resistance genes from domesticated and weedy species of rice

item Jia, Yulin
item WANG, XUEYAN - University Of Arkansas
item LIU, YAN - University Of Arkansas
item SCHEUEMANN, KLAUS - University Of Santa Catarina
item XING, JUNJIE - Hunan Hybrid Rice Research Center
item WANG, JICHUN - Jilin Agricultural University
item Gealy, David
item OLSEN, KENNETH - Washington University
item CAICEDO, ANA - University Of Massachusetts

Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: 10/2/2016
Publication Date: 10/8/2016
Citation: Jia, Y., Wang, X., Liu, Y., Scheuemann, K., Xing, J., Wang, J., Gealy, D.R., Olsen, K., Caicedo, A. 2016. Analysis of rice blast resistance genes from domesticated and weedy species of rice. Meeting Abstract. 7th IRBC, p81.

Interpretive Summary:

Technical Abstract: Blast disease of rice caused by Magnaporthe oryzae is the most serious crop disease worldwide. The fungus is known to be highly adaptive to host environments and resistance (R) genes often do not last for an extended period of time after their deployment. In the USA, a dozen genetically diverse blast races found in different frequencies have been identified over the past 50 years. These blast races have been effectively managed with the use of one or two major blast R gene clusters deployed in commercial rice varieties. To guide the future deployment of blast R genes in the USA, genome wide association was used to assess blast resistance and yield related components including plant height, days to heading, and seed weight in 151 selected rice germplasms. Results demonstrated that blast resistance is associated with a shorter plant, longer time to heading, and lighter seed weight. These results are particularly important for developing high yielding and blast resistant rice varieties worldwide. Additionally, bi-parental quantitative trait loci (QTL) mapping coupled with next-gen DNA sequencing was used to identify 28 resistance QTLs, some of which are novel in two commonly found US weedy red rice ecotypes, straw hull awnless and black hulled awned. We found that weedy red rice has evolved broad spectra of resistance to M. oryzae and some of these newly identified resistance QTLs will be useful for breeding for improved blast resistance. Progress on the development of more efficient DNA markers for improving blast resistance via a marker assisted selection approach will be reported.