ISHS Acta Horticulturae 329: VII International Symposium on Plant Growth Regulators in Fruit Production
STRUCTURAL, BIOCHEMICAL AND MOLECULAR ASPECTS OF ABSCISSION IN PEACH |
| Authors: | A. Ramina, G. Casadoro, N. Rascio |
| Abstract:
Abscission in peach leaf and fruit explants flushed with exogenous ethylene occurs according to different structural, biochemical, and molecular models. Cell separation in fruit explants is primarily a consequence of the middle lamella dissolution and a further involvement of the cell wall, while in leaf explants a massive digestion of the primary cell wall is responsible for shedding. The enzymes involved in the process are cellulase in the case of leaf abscission, and, in sequence, exo- and endo-polygalacturonases, and cellulase in fruit explants. Cellulase and exo-polygalacturonases are present as several ethylene regulated molecular forms. Western and Northern analysis pointed out that some homology exists between peach and avocado cellulases, and peach and tomato endo-polygalacturonases. | |
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