ABSTRACT

Crystals on the plant surface often consist of different substances as shown in Fig. 3.2 for leaf secretory hairs of Arctium tomentosum and Lycopersicon esculentum as well as crystals on the intact root surface of Ruta graveolens. Blue-fluorescing crystals are seen in secretory cells of multicellular hairs of the leaf. In other parts of secretory hairs the fluorescence spectra have maxima in blue (450-460 nm) and in the greenyellow (500-530 nm) spectral regions whereas crystals fluoresce with only one maximum 450460 nm. Sometimes crystals of the upper side of the leaf lighten in yellow (maximum 530 nm). Therefore, we can see possibilities of individual compounds from multicomponent secretion to crystallize in