摘要
Nitrogen （N） is one of the most important nutrients for plants. Its availability is a major limiting factor in crop productivity and yield. Since the ＂green revolution＂ in the middle of the 20th century, the amount of N fertilizer used in agriculture has risen dramatically worldwide, resulting in a significant reduction of nitrogen use efficiency （NUE） and serious economic, environmental, and public health con- cerns [1]. A key challenge for plant biologists and crop sci- entists is how to reduce N fertilizer consumption without negatively affecting crop yield. Developing crop varieties with improved NUEs is an important strategy for addressing this challenge, but little progress has been made because of the lack of understanding of the mechanisms controlling NUE in crop plants.
Nitrogen(N)is one of the most important nutrients for plants.Its availability is a major limiting factor in crop productivity and yield.Since the"green revolution"in the middle of the 20th century,the amount of N fertilizer used in agriculture has risen dramatically worldwide,resulting in a significant reduction of nitrogen use efficiency(NUE)and serious economic,environmental,and public health con-
