The researchers studied how spraying methanol and ethanol on Brassica napus plants affects their growth and photosynthesis. They found that both methanol and ethanol spraying increased plant biomass, root to shoot ratio, stomatal conductance, transpiration rate, CO2 concentration, photosynthetic rate, and chlorophyll content. However, they also decreased leaf H2O2 content. Overall, ethanol spraying had a more significant positive impact on plant growth and photosynthesis compared to methanol spraying.