Responses of nitrogen metabolism in rice plant to elevated atmospheric CO2 : A research review
大气 CO2 浓度升高对水稻氮代谢影响的研究进展

The increasing concentration of atmospheric CO2 has significant effects on the growth and development of C3 plants. Enhanced carbohydrate accumulation in plant tissues as the result of stimulated photosynthesis under elevated atmospheric CO2 affects carbon and nitrogen metabolism, and might alter the balance between them. Rice (Oryza sativa L.) is one of the most important food resources in the world and the changed nitrogen content of the rice grain affecting the quality of human nutrition has become a hot issue. Mainly based on the data from FACE (Free Air Carbon-dioxide Enrichment) experiments and some results from chamber-based trials, this paper reviewed the effects of the elevated atmospheric CO2 on the nitrogen uptake, allocation and assimilation including the nitrogen uptake and accumulation, nitrogen concentration, enzymes related to nitrogen metabolism, different nitrogen forms (mainly the protein-N ), the ratio of nitrogen/carbon, root exudates containing nitrogen and the relationship between nitrogen status and photosynthetic acclimation. The further research directions in this field were discussed as well.