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Inhibition by Calcium of Senescence of Detached Cucumber Cotyledons

Effect on Ethylene and Hydroperoxide Production

Division of Horticulture and Processing, Department of Scientific and Industrial Research, Private Bag, Auckland, New Zealand

The effect of Ca on senescence was followed in detached cucumber (Cucumis sativus L.) cotyledons floating on various solutions in the dark. Compared with those in water, cotyledons in 10^–4 molar CaCl₂ exhibited reduced chlorophyll loss and H₂O₂ production, reduced and delayed ethylene production, and did not undergo a burst in CO₂ production. In contrast, Mg had little effect on cotyledon senescence, whereas K stimulated chlorophyll loss but did not increase H₂O₂ accumulation of ethylene and CO₂ production. This reduction in the rate of senescence by Ca could also be achieved by increasing the endogenous levels of Ca in the cotyledons before excision, although the reduction was less than that with Ca in the external solution. The addition of H₂O₂ to the solutions on which cotyledons were floated stimulated chlorophyll breakdown, but effects on ethylene and CO₂ were not consistent.

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