| 【Objective】The effect of nitrogen on chlorophyll and photosynthesis of perilla frutescens under
drought stress was preliminarily determine.【Method】The effects of nitrogen application on the chlorophyll content and
photosynthetic index of different varieties of perilla frutescens under different drought stress were studied by pot experiment.
【Result】The results showed that the chlorophyll content, photosynthetic rate, transpiration rate, stomatal conductance and
intercellular CO2 concentration differed significantly under various drought stress conditions. The chlorophyll content were
increased with the increase of N application. With N application amount of more than 300 kg/hm2 under mild drought stress
treatment, chlorophyll content of TD-S-1 presented a downward trend, and that of LS-Y-1 continued to rise. TD-S-1 and
LS-Y-1 had the highest photosynthetic rate when the nitrogen application amount was 300 kg/hm2 under mild drought stress,
which was 1.39 times and 1.29 times higher than that without nitrogen application, respectively. The change trend of stomatal
conductance and transpiration rate was consistent with that of photosynthetic rate, and the intercellular CO2 concentration
was the lowest. 【Conclusion】It can be concluded that under mild drought stress, nitrogen application of 300 kg/hm2 has a
certain promoting effect on improving photosynthesis of perilla frutescens. |
