Genji Monogatari on autumn foliage

Day by day, autumn is making itself more and more apparent in my little garden. Cold nights almost completely stopped the growth of my bonsai. Recently, while reading Genji Monogatari I stumbled across an interesting remark made by one of the novel’s characters. It goes: “… Nothing is so beautiful as the brilliant dyes spread over the face of Nature, yet the red tints of autumn are often not dyed to a colour so deep as we desire, because of the early drying of the dew, so we say - such is the uncertain fate of this world.” I wonder whether dew really affects the colour of autumn foliage.