1. Biotechnology and Nuclear Technology Research Institute; Sichuan Academy of Agricultural Sciences; Chengdu, Sichuan P. R. China
2. Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education, College of Life Sciences; Sichuan University; Chengdu, Sichuan P. R. China
3. Soil and Fertilizer Institute; Sichuan Academy of Agricultural Sciences; Chengdu, Sichuan P. R. China