1College of Life Sciences, China West Normal University, Nanchong City, Sichuan Province, 637009, P. R. China.
2Maize Research Institute, Sichuan Agricultural University, Ya’an City, Sichuan Province, 625014, P. R. China.
3Maize Research Institute, Shanxi Academy of Agricultural Sciences, Xinzhou City, Shanxi Province, 034000, P. R. China.
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