Registration Of The Ki14 X B73 Recombinant Inbred Mapping Population Of Maize

The Ohio Agricultural Research and Development Center released Ki14 x B73 maize (Zea mays L.) mapping population (Reg. No. MP-2, MGS 9025066 MAP; Maize Genetics COOP Stock Center no. Z042), a set of 119 recombinant inbred lines (RILs), in 2007. The mapping population was derived from a biparental cross between tropical inbred Ki14 (NCRPIS accession Ames 27259) and temperate inbred B73 (Reg. No. PL-17, PI 550473). One hundred sixteen of the original RILs were used for mapping quantitative trait loci associated with host resistance to foliar pathogens inciting southern corn leaf blight [caused by Cochliobolus heterostrophus (Drechs.)], gray leaf spot, (caused by Cercospora zeae-maydis Tehon & E.Y. Daniels), and northern corn leaf blight [caused by Setosphaeria turcica (Luttrell) K.J. Leonard & E.G. Suggs], three traits associated with maturity-days to anthesis, days to silking, and anther silk interval-and two morphological traits, plant and ear height. The genetic marker data included 765 single nucleotide polymorphisms and 74 simple sequence repeat markers genotyped on all the RILs and constructed into a genetic map. It is envisioned that the high level of host resistance of Ki14 and the agronomic performance of B73 will invite use of the population as a germplasm source for improved host resistance of temperate zone, and increased yield potential, of tropical zone maize. Distribution of the RIL mapping population will allow public access to this resource for continued mapping, gene discovery, and plant breeding.