The characters of SP1 variation plants at maturity stage also appeared big changes.SP1 variation plants had short growing period, high seed setting rate, loose plant-type and clavated spike-type.

• 成熟期SP1代变异株性状也有较大变化，表现为生育期显著缩短，结实率有所提高，株型向松散趋势发展，穗型则均表现为棍棒形，株高、穗粒数和千粒重的变化品种间表现不一致。