ISHS Acta Horticulturae 381: International Symposium on Natural Phenols in Plant Resistance
A POSSIBLE INVOLVEMENT OF GIBBERELLIC ACID IN CELERY RESISTANCE TO PATHOGENS DURING STORAGE |
| Authors: | U. Afek, N. Aharoni, S. Carmeli |
| Keywords: | Celery, resistance, psoralens, marmesin, storage, decay |
| Abstract:
Psoralens (furanocoumarins) have been considered as phytoalexins associated with celery resistance to pathogens. However, our results indicated that psoralens have a weak antifungal activity in vitro. Therefore, we are proposing an alternative mechanism for celery resistance to pathogens during storage: This mechanism suggests that marmesin, the precursor of psoralens in celery and other plants, which have at least 100 times greater antifungal activity in vitro than psoralens, are associated with celery resistance to pathogens. Increase susceptibility of celery to pathogens during storage was accompanied by an increase in psoralen concentration and a corresponding decrease in marmesin concentration. However, postharvest treatment of celery with gibberellin (GA3) prior to storage resulted in decay inhibition and a corresponding delay in psoralen concentration increase and marmesin concentration decrease. | |
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