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BioMed Research International
Volume 2017, Article ID 7641362, 6 pages
Research Article

Association Analysis of Arsenic-Induced Straighthead in Rice (Oryza sativa L.) Based on the Selected Population with a Modified Model

1State Key Lab of Rice Biology, IAEA Collaborating Center, Zhejiang University, Hangzhou, Zhejiang, China
2Zhejiang Academy of Agricultural Sciences, Hangzhou, China
3Rice Research Institute, Jiangxi Academy of Agricultural Sciences and Nanchang National Sub-Center for Rice Improvement, Nanchang, Jiangxi, China
4Institute of Tobacco Research of Chinese Academy of Agricultural Sciences, Qingzhou, Shandong, China

Correspondence should be addressed to Ning Zhang; moc.621@ujzgningnahz

Received 19 January 2017; Accepted 4 June 2017; Published 25 July 2017

Academic Editor: Momiao Xiong

Copyright © 2017 Xiaobai Li et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


A rice physiological disorder makes mature panicle keep erect with empty grains termed as “straighthead.” Straighthead causes yield losses and is a serious threat to rice production worldwide. Here, a new study of association mapping was conducted to identify QTL involved in straighthead. A subset of 380 accessions was selected from the USDA rice core collection and genotyped with 72 genome-wide SSR markers. An optimal model implemented with principle components (PCs) was used in this association mapping. As a result, five markers were identified to be significantly associated with straighthead. Three of them, RM263, RM169, and RM224, were consistent with a previous study. Three markers, RM475, RM263, and RM19, had a resistant allele associated with a decrease in straighthead rating (straighthead rating ≤ 4.8). In contrast, the two other marker loci RM169 and RM224 had a few susceptible alleles associated with an increase in straighthead rating (straighthead rating ≥ 8.7). Interestingly, RM475 is close to QTL “qSH-2” and “AsS” with straighthead resistance, which was reported in two studies on linkage mapping of straighthead. This finding adds to previous work and is useful for further genetic study of straighthead.