[2] Ahmed M H,Mohamed N A.Annals of Agricultural Science,1994,32(4):1759.
[6] Peel M D,Waldron B L,Jensen K B,et al.Crop Science,2004,44(6):2049.
[7] Dobrenz A K,Robinson D L,Smith S E,et al.Poteet.Crop Science,1989,29,493.
[8] Abdullah A,Al-Doss A,Smith S E.Crop Science,1998,38,568