Agricultural Research Service Dale Bumpers National Rice Research Center

Stuttgart, AR, United States

Agricultural Research Service Dale Bumpers National Rice Research Center

Stuttgart, AR, United States
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Liu Y.,University of Arkansas | Liu Y.,Agricultural Research Service Dale Bumpers National Rice Research Center | Qi X.,Washington University in St. Louis | Gealy D.R.,Agricultural Research Service Dale Bumpers National Rice Research Center | And 3 more authors.
Molecular Plant-Microbe Interactions | Year: 2015

Understanding the genetic architecture of adaptation is of great importance in evolutionary biology. U.S. weedy rice is well adapted to the local conditions in U.S. 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 U.S. weedy rice accessions with 14 blast races, and investigated the quantitative trait loci (QTL) associated with blast resistance in two major ecotypes of U.S. weedy rice. Our results revealed that U.S. weedy rice exhibited a broad resistance spectrum. Using genotyping by sequencing, we identified 28 resistance QTL in two U.S. weedy rice ecotypes. The resistance QTL with relatively large and small effects suggest that U.S. weedy rice groups have adapted to blast disease using two methods, both major resistance (R) genes and QTL. Three genomic loci shared by some of the resistance QTL indicated that these loci may contribute to no-race-specific resistance in weedy rice. Comparing with known blast disease R genes, we found that the R genes at these resistance QTL are novel, suggesting that U.S. weedy rice is a potential source of novel blast R genes for resistant breeding. © 2015 The American Phytopathological Society.


Wang X.,University of Arkansas | Wang X.,Agricultural Research Service Dale Bumpers National Rice Research Center | Wang X.,China Jiliang University | Jia M.H.,Agricultural Research Service Dale Bumpers National Rice Research Center | And 4 more authors.
Molecular Plant-Microbe Interactions | Year: 2015

Robust disease resistance may require an expenditure of energy that may limit crop yield potential. In the present study, a subset of a United States Department of Agriculture rice core collection consisting of 151 accessions was selected using a major blast resistance (R) gene, Pi-Ta, marker and was genotyped with 156 simple sequence repeat (SSR) markers. Disease reactions to Magnaporthe oryzae, the causal agent of rice blast disease, were evaluated under greenhouse and field conditions, and heading date, plant height, paddy and brown seed weight in two field environments were analyzed, using an association mapping approach. A total of 21 SSR markers distributed among rice chromosomes 2 to 12 were associated with blast resistance, and 16 SSR markers were associated with seed weight, heading date, and plant height. Most noticeably, shorter plants were significantly correlated with resistance to blast, rice genomes with Pi-Ta were associated with lighter seed weights, and the susceptible alleles of RM171 and RM6544 were associated with heavier seed weight. These findings unraveled a complex relationship between disease resistance and yield-related components. © 2015 The American Phytopathological Society.

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