Fig. 3.

Microscopy observations on chlorophyll loss in senescing ‘non-bruised’ and ‘bruised’ shreds of lettuce stored at 4 °C a Day 1 of storage. b Senescing area, day 4. c Cut edge, day 4. d Bruised site, day 4. e–h Fluorescence of chlorophyll in panels a–d, respectively. a–d Light microscopy; e–h Fluorescent microscopy. At sites loosing chlorophyll the red fluorescence is fading or not detectable. Scale bars = a and e 200 μm, b–d and f–h 100 μm