The purpose of this experiment was to determine the disturbance effect of indirect exposure to DCMU (3-[3,4-dichlorophenyl]-1,1-dimethylurea), a popular herbicide, on dark adapted fluorescence and stomatal conductance in Malva parviflora plants. We utilized a test site exposed to sunlight and free from other external interference. Two main apparatuses were used to collect data; stomatal conductance was measured by a leaf porometer, and dark-adapted fluorescence (Fv/Fm) was measured using a Pulse Modulated Fluorometer. Our data yielded significant comparison results for dark-adapted fluorescence (P<0.05); however, the difference in stomatal conductance before and after disturbance was insignificant with a Student’s t-test (P>0.05). Additionally, observations six days after disturbance showed a drastic presence of hollyhock rust (Puccinia malvacearum) and aphids (Aphidoidea sp.) that may have contributed to the significance seen in dark-adapted fluorescence. The combination of the weed killer, rust, and aphids prove to be feasible methods in controlling spread of Malva parviflora.
Maka, Piueti; Bryant, Mia; and Sarwono, Isabelle, "Dark-adapted fluorescence and stomatal conductance after DCMU (3-(3,4-dichlorophenyl)-1, 1-dimethylurea)) exposure on Malva parviflora plants" (2017). Pepperdine University, Featured Research. Paper 178.