Currently, immature embryo is the most widely used explant for maize regeneration and transformation. However, this material source is restricted by geographical condition, developmental stages and the growing season. Here, we isolated different parts the of three-day-old seedlings to study their regeneration capacity, aiming to establish an alternative efficient regeneration system for maize. Using the shoot tips and primary root of three-day-old seedlings of maize germinated in dark and light as explants,...