We have resequenced a group of six elite maize inbred lines, including the parents of the most productive commercial hybrid in China. This effort uncovered more than 1,000,000 SNPs, 30,000 indel polymorphisms and 101 low-sequence-diversity chromosomal intervals in the maize genome. We also identified several hundred complete genes that show presence/absence variation among these resequenced lines. We discuss the potential roles of complementation of presence/absence variations and other deleterious mutations in contributing to heterosis. High-density SNP and indel polymorphism markers reported here are expected to be a valuable resource for future genetic studies and the molecular breeding of this important crop.
Bibliographical noteFunding Information:
Supported by the 973 program (2009CB118400; 2007CB815703; 2007CB815705; 2007CB109000), the 863 project (2010AA10A106), the National Natural Science Foundation of China (30725008), the Shenzhen Bureau of Science Technology & Information, China (ZYC200903240077A; CXB200903110066A), the Chinese Academy of Science (GJHZ0701-6), the Ole Rømer grant from the Danish
Natural Science Research Council and the US National Science Foundation (DBI-0527192). We thank L. Goodman for editing the manuscript.