1. College of Agronomy, Shenyang Agricultural University, Shenyang, Liaoning 110866, China
2. The Key Laboratory of Maize Biology and Genetic Breeding in Arid Area of Northwest Region, Yangling, Shaanxi 712100, China
3. Maize Engineering & Technology Research Centre, College of Agronomy, Northwest A&F University, Yangling, Shaanxi 712100, China