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Effects of Preharvest Applications of AVG on Ripening of ‘Bartlett’ Pears With and Without Cold Storage
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Abstract
Application of 400 ppm aminoethoxyvinylglycine (AVG) to pear trees 6 and 2 weeks before harvest resulted in marked but variable inhibition of postharvest ripening at 20°C. AVG amplified the usual nonuniformity in the initiation of ripening exhibited by freshly harvested fruit. Prolonged storage of the fruit at 0 to 2°c counteracted the inhibitory effects with resultant rapid and uniform ripening upon transfer to 20°c. However, a physiological nonuniformity as reflected by wide differences in internal C2H4 concentration persisted well beyond the time when threshold levels for the initiation of ripening had been reached by all fruit. Probable relationships between AVG effects, cold storage, and C2H4 are illustrated diagrammatically.
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HortScience