Figure 8.

General patterns of histochemical gradients in the cortex of Nothotrioza cattleiani galls on Psidium cattleianum. Shading from white to dark means increasing intensity of reaction. (1) Centripetal gradient of reducing sugars from the outermost cortical cells towards the innermost ones. (2, 9) Centrifugal gradients of starch and lignins, respectively, from the median cortical cells towards the outer cells. (3, 6, 7, 8, 10) Bidirectional gradients of proteins, phenolics, proanthocyanidins and ROS, respectively, from the median cortical cells towards both the inner and outer cell layers. (4, 5) Centripetal gradients of glucose-6-phosphatase and invertases activities, from the median cortical cells towards the inner cell layers, especially in the perivascular parenchyma.