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KMID : 0903619840250010045
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Journal of the Korean Society for Horticultural Science
1984 Volume.25 No. 1 p.45 ~ p.49
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The Fruit Growth Curves and Changes in Carbohydrates of the Fruit of Four Pear Cultivars (Pyrus pyrifolia)
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Abstract
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This experiment was designed to investigate into the pattern of fruit growth of pears (cv. `Kosui´, `Hosui´, `Danbai´ and `Okusankichi´) and its relation to seasonal changes in carbohydrates. The results are as follows.
1. The growth curve of fruit weight exhibited a single sigmoid curve in which three growth stages were distinct: a logarithmic phase showing a slow growth rate at first followed by a continuous increase later; a linear phase showing a constant and maximum growth rate; a senescence phase showing a decreasing growth rate.
The early and mid-season cultivars were characterized by a relatively short duration of linear phase as compared to the late ones.
2. The fruit growth curve of longitudinal length(L) and the transverse diameter(D) was relatively linear when compared with that of fruit weight. The L/D ratio decreased and then levelled off approximately 110 days after full floom in mid-and late season cultivars while the early one showed a continuous decrease until harvesting time.
3. The changes in total carbohydrates, especially total sugar and reducing sugar were similar to the patterns of fruit growth curve. However, starch increased by July and later decreased consistently until harvest.
The increase in non-reducing sugar was gradual in all cultivars except Okusankichi which showed a gradual increase at first but tend to decrease near harvesting time.
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