Caster Bean Thin Section
B-2A Longpass (Medium Bandwidth Excitation) Blue 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 blue region, chlorophyll has an absorption band with a high extinction coefficient and produces a significant amount of fluorescence when excited with wavelengths between 420 and 460 nanometers. Note the presence of significant spectral bleed-through from autofluorescence emission in the yellow and red spectral regions with the B-2A filter combination.