Cover illustration: (Top) Cross-section of failed penetration attempt of a root parasitic plant (Orobanche crenata) on a resistant pea root (stained with alcian green and safranin). The strong red staining with safranin delimits the interface between host (left) and parasite (right). (Upper middle) The same section observed under fluorescence (450–490 nm). Brilliant spheres in parasite tissues are starch grains. (Lower middle) Single optical section (Nomarsky) of a cell of resistant pea using a confocal microscope. (Bottom) Localization of mRNA of a peroxidase in the same pea cell during O. crenata infection by in situ hybridization using confocal microscopy. Nuclei appears blue due to DAPI staining. (See Pérez-de-Luque et al., pp. 1461–1469.)
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