1. State Key Laboratory of Crop Stress Biology for Arid Areas College of Life Sciences Northwest A&F University Yangling Shaanxi 712100 China
2. The Key Laboratory of Biology and Genetic Improvement of Maize in Arid Areas of the Northwest Region Ministry of Agriculture Northwest A&F University Yangling Shaanxi 712100 China
3. The Biology Teaching and Research Core Facility College of Life Sciences Northwest A&F University Yangling Shaanxi China
4. Department of Horticulture Seed Biology Group College of Agriculture, Food, and Environment University of Kentucky Lexington KY 40546 USA
5. Center of Seed Science and Technology Beijing Key Laboratory of Crop Genetics and Breeding Innovation Center for Seed Technology (Ministry of Agriculture) China Agricultural University Beijing 100094 China