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《农业科学学报(英文版)》 2017-05
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Yield potential and nitrogen use efficiency of China's super rice

WANG Fei;PENG Shao-bing;Key Laboratory of Crop Ecophysiology and Farming System in the Middle Reaches of the Yangtze River, Ministry of Agriculture/College of Plant Science and Technology, Huazhong Agricultural University;National Key Laboratory of Crop Improvement, Huazhong Agricultural University;  
In 1996, a mega project that aimed to develop rice varieties with super-high yield potential(super rice) was launched by the Ministry of Agriculture(MOA) in China using a combination of the ideotype approach and intersubspecific heterosis. Significant progress has been made in the last two decades, with a large number of super rice varieties being approved by the MOA and the national average grain yield being increased from 6.21 t ha~(-1) in 1996 to 6.89 t ha~(-1) in 2015. The increase in yield potential of super rice was mainly due to the larger sink size which resulted from larger panicles. Moreover, higher photosynthetic capacity and improved root physiological traits before heading contributed to the increase in sink size. However, the poor grain filling of the later-flowering inferior spikelets and the quickly decreased root activity of super rice during grain filling period restrict the achievement of high yield potential of super rice. Furthermore, it is widely accepted that the high yield potential of super rice requires a large amount of N fertilizer input, which has resulted in an increase in N consumption and a decrease in nitrogen use efficiency(NUE), although it remains unclear whether super rice per se is responsible for the latter. In the present paper, we review the history and success of China's Super Rice Breeding Program, summarize the advances in agronomic and physiological mechanisms underlying the high yield potential of super rice, and examine NUE differences between super rice and ordinary rice varieties. We also provide a brief introduction to the Green Super Rice Project, which aims to diversify breeding targets beyond yield improvement alone to address global concerns around resource use and environmental change. It is hoped that this review will facilitate further improvement of rice production into the future.
【Fund】: financially supported by the grants from the National High-Tech R&D Program of China (863 Program 2014AA10A605);; the Fundamental Research Funds for the Central Universities China (2015BQ002)
【CateGory Index】: S511
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