ISHS Acta Horticulturae 487: VI International Symposium on Processing Tomato & Workshop on Irrigation & Fertigation of Processing Tomato
ANATOMICAL AND CYTOLOGICAL STUDY OF ABSCISSION ON PROCESSING TOMATO FRUITS |
| Authors: | T. Tabuchi, S. Wada, N. Arai |
| Keywords: | L. esculentum, processing tomato, abscission, anatomy, histochemistry |
| Abstract:
Fruit abscission in processing tomato was anatomically and histochemically investigated. At mature-green stage, cell sizes of the fruit-peduncle tissue were not different from the adjacent cells. At the matured, these cells were longitudinally elongated, and cavities were formed. Histochemical study showed that the pectic materials were dissoluted from the middle lamella of the enlarged cells. This result indicated that the cell degrading enzymes may play a significant role in fruit abscission. Peroxidase activity was markedly localized on the surface of the scar of abscission region after the matured stage of fruit development. This result suggested that peroxidase contributed to lignification of scar after fruit separation.  -galactosidase activity was localized in the fruit-peduncle tissue at the mature-green and matured stages of the fruit development.
However, no activity was found in the expanded cells at a week after matured stage. -galactosidase may cause cell wall elongation in the separation region.
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