552 Produce Degradation: Reaction Pathways and their Prevention
FIGURE 18.15Scanning electron micrographs of the interior of red seedless grape. (a) Fresh
external layers and mesocarp tissue. (b) Aged external layers and mesocarp showing the
remnants of an object that had pierced the grape and was removed, showing callus growth
on the grape surface. (c) Aged sample showing collapsed cells of the mesocarp. (d) Fresh
sample showing mesocarp cell walls. (e) Aged sample showing collapse and distortion of the
mesocarp cell walls. (f) Fresh section epidermis and exocarp showing thin cell walls. (g) Aged
epidermis and exocarp showing thickened cell walls and some collapse of the epidermis and
exocarp tissues. C, callus tissue; IS, intercellular space; ML, middle lamella. Magnification
bars: a, b, 1 mm; c, 250 μm; d, 100 μm; e, 200 μm; f, g, 50 μm.