About the Authors
School of Life Sciences, Shandong University, Ministry of Education Key Laboratory of Plant Cell Engineering and Germplasm Enhancement, Jinan, China
College of Agriculture Vocational, Xuzhou Biology Engineering Technical College, Xuzhou, China
The authors have declared that no competing interests exist.
Conceived and designed the experiments: KZ. Performed the experiments: HL PT HC. Analyzed the data: KZ HL PT. Contributed reagents/materials/analysis tools: PT HL. Wrote the paper: KZ HL.