Abstract
The internal structure of courgette and the effect of freezing the courgette was investigated by nuclear magnetic resonance imaging. The skin, vascular tissue, cortex, seed-bed and seeds were clearly delineated in the fresh vegetable; however, the image of frozen/thawed courgette showed very little contrast between the different tissues. Freezing ruptures the cell walls and alters the tissue morphology; this affects the transverse relaxation of water in the tissue, which in turn changes the image contrast. This report demonstrates that a correct theory to explain the mechanisms that cause proton relaxation in tissues is vital for correlating image contrast with the physicochemical properties of water in plant tissue.
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