plants fertilized with 0.5 mM NH4
+
+ 4.5 mM NO3
−
resulted in better growth
and had intact chloroplast ultrastructure and a higher degree of granal stacking, chlorophyll contents and
net photosynthetic rate, as well as larger root system. Our results indicate that compared with nitrate,
adding moderate ammonium concentration in the nutrient could alleviate low light intensity stress in
mini Chinese cabbage seedling by regulating root architecture and photosynthesis. The challenge is to
determine how to manage ammonium:nitrate ratio according to the various light intensities during plant
growth process.
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