“…This species offers the advantage of utilizing many individual plants of identical genetic background at each sampling, thus greatly reducing sampling error and variation due to genetic differences. Furthermore, this species has previously been shown to be quite sensitive to photobleaching diphenyl ether herbicides (Matsumoto et al, 1990), and we chose it to further extend these studies. Unlike any previous study, we have determined the effects of the herbicide on virtually all of the intermediates of chlorophyll synthesis, from uroporphyrin III to protochlorophyllide.…”