ISHS Acta Horticulturae 239: VI International Symposium on Growth Regulators in Fruit Production
EFFECT OF PACLOBUTRAZOL ON THE POSTHARVEST QUALITY OF WINTER PEARS |
| Authors: | P.M. Chen, E.A. Mielke, D.M. Varga |
| Abstract:
Paclobutrazol (PP333), was applied as a soil drench to mature 'd'Anjou' and 'Bosc' (Pyrus communis L.) pear trees at 6 and 10 g (a.i.) per tree in 1983. In both cultivars fruits harvested from treated trees in 1986 were firmer, but had less titratable acidity (TA) than the control fruits. Malic acid was the main organic acid responsible for the lower acidity. After cold storage, malic acid decreased in response to increased rates of PP333, while succinic, citric, and fumaric acids increased slightly or remained at the same levels. Changes in extractable juice in fruits during ripening were similar regardless of the sources of fruits indicating that fruits from the treated trees were capable of ripening normally after cold storage. | |
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