Acknowledgements
This work was supported by grants from the National Natural
Science Foundation of China (31171497), the National
Science and Technology Project (2013BAD07B06-2), the
System of Maize Modern Industrial Technologies
(nyhyzx07-003), Public Service Sectors (Agriculture)
Research and Special (201203096;201203100),the Ministry
of Agriculture System of Maize Industrial Technologies
(CARS-02), the Shandong Province Corn Seed Industry
Project (Lukenongzi[2011]186) and the Ministry of
Agriculture Welfare Industry, Science and Technology
(20120306).