Development of new cut flower crops through regulating the signal transduction and mechanisms of hypersensitive physiological disorders after harvest

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With a view to developing new cut flower crops, we investigated the postharvest characteristics of canna leaves. The leaf electric potential decreased rapidly after harvest, suggesting that the electric signal caused inrolling and necrotic disorders of leaves. The occurrence of necrotic disorder was accompanied by a decrease in quantum yield. The old leaves harvested at noon exhibited severe disorders, while the young leaves harvested before sunrise rarely did. In these young leaves, the scavenging capacity of active oxygen, such as ascorbate peroxidase activity, was higher than that of old leaves.