Caster Bean Thin Section
G-1A Longpass Emission (Narrow Bandwidth Excitation) Green Set
Autofluorescence emission intensity from a thin section of caster bean (Ricinus communis) tissue. Endogenous autofluorescence in plant tissues arises from a variety of biomolecules, including chlorophyll, carotene, and xanthophyll. In the green excitation region, chlorophyll has an absorption band with a low extinction coefficient, but still produces a detectable level of fluorescence at emission wavelengths of 550 nanometers and above (green, yellow, orange, and red). For the caster bean thin section illustrated above, note the presence of autofluorescence emission intensity in the orange and red spectral regions, but the absence of intensity at lower (green and blue) wavelengths.