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Comparison Of Uva Absorbance In Sun And Shade Leaves, James Newton, Kevin Rivera, James Kim

Featured Research

In observing chaparral species’ resistance to abiotic plant stresses, this investigation sought to study plant defense against UVA radiation in sun and shade leaves. We predicted that sun leaves would have higher absorbance of UV radiation considering their day-long exposure to sunlight.

UVA (350nm-400nm) absorbance in sun and shade leaves of Heteromeles arbutifolia and Malosma laurina were measured using an integrating sphere. Four leaves from each group were surveyed for reflectance and absorbance. Using the spectrophotometer, reflectance in the green wavelengths (500-600nm) was measured and divided by reflectance in the red (600-700nm) to give a quantitative estimation of the redness …

The Effects Of Light Intensity And Color Absorption Of Diurnal Leaf Movements Of Malva Parviflora, Amy Lawrence, Ben Young, Matthew Yarborough

Featured Research

Our group measured the heliotropic response rate of the Malva parviflora under various light environments in order to see the effect that light color and intensity had on daily leaf movement. In our experiment we measured the leaf angle of plants under white, blue, red and green light, as well as plants under shade, over a specific duration of time in order to determine the rate of change. We ran a One-Way Analysis of Variance on leaf angle for light color as well as coverage at a 0.05 level using SPSS 17.0. The ANOVA test showed no significance for light …