Plant Physiology and Biochemistry cover
Plants are constantly challenged by biotic stresses and little is known about how plants distinguish and respond, at the molecular level, to the very different threats posed by various pathogens, mechanical wounding and herbivory. DNA microarrays are promising tools for the study of plant pathogenesis. Reymond (pp. 313-321) reviews the several potential applications of the technology and gives examples of the utility of custom small-scale microarrays in plant defence. The cover photograph shows a larva of the cabbage butterfly (Pieris rapae) feeding on an Arabidopsis leaf. In the background is a pseudocolor representation of a DNA microarrays containing 150 defence-related Arabidopsis genes. Induced genes are shown in red, repressed genes in green, and genes expressed at roughly equal levels between treatments appear as yellow spots.