1. Key Laboratory of Crop Eco-Physiology and Farming System in Southwest China, Ministry of P.R. China, Wenjiang, Sichuan 611130, China
2. College of Agronomy, Sichuan Agricultural University, Wenjiang, Sichuan 611130, China
3. Rice Research Institute, Sichuan Agricultural University, Wenjiang, Sichuan 611130, China