Question

the effect of nitrogen level on rice growth, carbon-nitrogen metabolism and gene expression

Answer 1

As one of the essential macroelements, nitrogen (N) plays an important role in plant growth and development. In order to know the effect of different N levels on the rice plant growth and carbon-nitrogen metabolism, we analyzed the rice growth phenotype, leaf SPAD value, photosynthesis, carbon-nitrogen metabolic status and gene expression profile under four different N levels (0×N, 0.1×N, 1×N and 5×N). The plant height and dry weight increased with increasing N levels, whereas an opposite trend was observed for the root length, which decreased with increasing N levels. The leaf SPAD value, stem nitrate concentration, soluble proteins, photosynthetic rate, stomatal conductance and total nitrogen concentration increased with increasing N levels, whereas an opposite trend was observed for soluble carbohydrates and carbon/nitrogen ratio which decreased with increasing N levels. 

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