7Martin G C,Russell W A.Correlated responses of yield and other agronomic traits to recurrent selection for stalk quality in a maize synthetic. Crop Science . 1984
8Sm ith JS C,Duvick D N,Sm ith O S,etal.Changesin pedigree back-grounds ofpioneer brand m aize hybrids widely grown from 1930 to1999. Crop Science . 2004
9Hagdorn S,Lamkey K R et al.Molecular genetic diversity among progenitors and derived elite lines of BSSS and BSCBI maize poputions. Crop Science . 2003
