Abstract
Following harvest, Kinnow mandarin (Citrus nobilis Ă Citrus deliciosa) fruits were variously treated with gibberellins (GA) and cytokinins. Ethylene caused marked chlorophyll (Chl) degradation and its effect was partially reversed by kinetin and benzylaminopurine (BAP) and to a lesser extent by GA3 and GA4+7. No appreciable accumulation of carotenoids (Car) occurred in these fruits irrespective of treatment. The loss of Chl during natural maturation was significantly reduced by cytokinins. Treatments with gibberellins alone or in combination with cytokinins were much less effective. The reduced loss of Chl in response to exogenously applied cytokinins may be probably related to a decline in its endogenous levels.
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