State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, College of Agriculture, South China Agricultural University, Guangzhou, 510642, China. Scientific Observing and Experimental Station of Crop Cultivation in South China, Ministry of Agriculture and Rural Affairs, Guangzhou, 510642, China. Guangzhou Key Laboratory for Science and Technology of Aromatic Rice, Guangzhou, 510642, China. The College of Natural Resources and Environment, College of Agriculture, South China Agricultural University, Guangzhou, 510642, China. State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, College of Agriculture, South China Agricultural University, Guangzhou, 510642, China. tangxr@scau.edu.cn. Scientific Observing and Experimental Station of Crop Cultivation in South China, Ministry of Agriculture and Rural Affairs, Guangzhou, 510642, China. tangxr@scau.edu.cn. Guangzhou Key Laboratory for Science and Technology of Aromatic Rice, Guangzhou, 510642, China. tangxr@scau.edu.cn.