Development of Genetically Broad‐based Inbred Lines of Maize for Early‐Maturing (70–80RM) Hybrids

ND2005 (Reg. No. PL‐354, PI 650885) and ND2006 (Reg. No. PL‐355, PI 650886) are two new maize (Zea mays L.) inbred lines developed for use as parents for 70‐80 relative maturity (RM) hybrids by the North Dakota State University maize breeding program and released by the North Dakota Agricultural Experiment Station in February 2007. ND2005 originated from the improved breeding population NDSM(M)C5 through a modification of pedigree selection including six years of early and late generation testing across 64 environments. ND2006 derived from the improved breeding population NDSBF(LM)C7(HGR)C4 through pedigree selection including five years of early and late generation testing across 31 environments. On the basis of their grain moisture at harvest, ND2005 and ND2006 were released as parents for development of very early maturing hybrids (<80RM). In addition to early maturity, ND2005 produced hybrids with above‐average test weight and lodging resistance. ND2006 produced hybrids with above‐average grain protein content. ND2005 and ND2006 combined best with Iodent and LH82 derived testers. ND2005 also combined well with early B14 types across eastern and western North Dakota.