QTL Analysis for Resistance to Blast Disease in U.S. Weedy Rice
2015
Liu, Yan | Qi, Xinshuai | Gealy, David R. | Olsen, Kenneth M. | Caicedo, Ana L. | Jia, Yulin
Understanding the genetic architecture of adaptation is of great importance in evolutionary biology. US weedy rice is well-adapted to the local conditions in US rice fields. Rice blast disease is one of the most destructive diseases of cultivated rice worldwide. However, information about resistance to blast in weedy rice is limited. Here, we evaluated the disease reactions of 60 US weedy rice accessions with 14 blast races, and investigated the QTLs associated with blast resistance in two major ecotypes of US weedy rice. Our results revealed that US weedy rice exhibited a broad resistance spectrum. Using genotyping by sequencing (GBS), we identified 28 resistance quantitative trait loci (QTLs) in two US weedy rice ecotypes. The resistance QTLs with relatively large and small effects suggest that US weedy rice groups have adapted to blast disease using two ways, both major resistance genes and QTLs. Three genomic loci shared by some of the resistance QTLs indicated that these loci may contribute to no-race-specific resistance in weedy rice. Comparing with known blast disease resistance (R) genes, we found that the R genes at these resistance QTLs are novel, suggesting that US weedy rice is a potential source of novel blast R genes for resistant breeding.
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