Nitrogen supply in combination of nitrate and ammonium enhances harnessing of elevated atmospheric CO2 through improved nitrogen and carbon metabolism in wheat (Triticum aestivum)

摘要: Elevated carbon dioxide (e-CO2) levels from ambient (a-CO2) enhance plant biomass production and yield. However, this response is highly dependent on the availability possibly form of nitrogen (N) supply to plants. This study aimed investigate changes in C N metabolism wheat (Triticum aestivum L.) e-CO2 source. enhanced net CO2 assimilation but at variable rates depending supply. Under e-CO2, rate was order NO3– > NH4NO3 NH4+ urea. Plants supplied with ammonium nitrate (i.e. NH4NO3) performed better terms expressed a higher enhancement ratio by than plants receiving sole applications NO3–, or Supply also resulted lower intercellular CO2, photoassimilate translocation roots accumulation free amino acids other forms, indicating exploitation environment. Our results conclude that major physiological pathways photosynthesis protein carbohydrate are differentially influenced source A balanced key harnessing while minimising its adverse effects quality produce.