抄録
Dicotyledonous plants usually found in habitats with more nitrogen were showing fewer, not more, chloroplasts in their guard cells of stomata, on average. Obviously, this effect is not one of nitrogen as a nutrient.-Ammonium sulfate added to nitrophilous plants with low chloroplast numbers increased these numbers, whereas nitrophilous plants with high numbers and non-nitrophilous plants with any numbers did not react. Some species need more nitrogen for reproducing their chloroplasts in guard cells to the specific level than do other species.
