Jiangsu Key Laboratory of Crop Genetics and Physiology/Jiangsu Key Laboratory of Crop Cultivation and Physiology/Jiangsu Co-Innovation Center for Modern Production Technology of Grain Crops University 225009.R.China;
Joint International Research Laboratory of Agriculture and Agri-product Safety of Education University 225009.R.China;
RICE; N-efficient varieties; nitrogen use efficiency; root morpho–physiological traits; nitrogen translocation; leaf morphology; canopy structure;