Rquibi, Leila E.2021-07-302021-07-302021-07https://hdl.handle.net/11299/222602The circadian clock is an endogenous c. 24 hour timekeeping mechanism which regulates a number of plant processes. Stomata are leaf pores which open and close for water and gas exchange. In this study, I sought to examine whether stomatal behavior is influenced by the clock. To do so, I measured the stomatal aperture of 8 lines of Brassica rapa (B. rapa) with different circadian periods (the time it takes the clock to complete one full oscillation) 1 hour before dawn and 1 hour after dawn over three days. I hypothesized that plants with different periods would differ in mean stomatal aperture at each time point and the amount that aperture changed between the two timepoints. I found that the lines differed in their aperture and change in aperture, though those with similar period length did not necessarily demonstrate similar trends in aperture.encircadianstomataclockBrassica rapaPresentation