9Kahler L J, Kahler S A, Thompson R S, et al. North Ameri- can study on essential derivation in maize: II. Selection and e- valuation of a panel of simple sequence repeat lociEJ]. Crop Sci. , 2010, 50: 486-503.
10Martin J M, Blake T K, Troyer A F, et al. Background of U. S. hybrid corn II: Breeding, climate, and food[J].Crop Sci. , 2004, 44:370-380.