Abstract:

The increasing deterioration of the environment has forced people to abandon the concept of high-fertilizer production and shift to the concept of low-fertilizer green production. This study reviewed different metabolic levels, and morphological, physiological and molecular responses of plants from five aspects: enzymes involved in nitrogen metabolism, nitrogen assimilation pathways, primary metabolism, secondary metabolism and nitrogen metabolism-related genes under low nitrogen stress, discussed the low nitrogen tolerance strategies of plants at different growth stages, and expounded the enzymes related to nitrogen use efficiency (NUE) and their regulatory mechanism in the process of resisting nitrogen stress. It is proposed that in the future, according to the differences of low nitrogen tolerance of different plants or different growth periods of the same plant, and the relationship of key gene expression products, the molecular response mechanisms of plants under low nitrogen stress could be systematically and comprehensively studied from multiple disciplines and perspectives, so as to provide theoretical reference for the research on plant nitrogen metabolism involved in low nitrogen stress.

Key words: plant, low nitrogen stress, nitrogen metabolism, primary metabolism, secondary metabolism