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KMID : 0903619860270010034
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Journal of the Korean Society for Horticultural Science
1986 Volume.27 No. 1 p.34 ~ p.43
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Growth Pattern and Seasonal Changes of chemical Compositions in Leaves , Shoots and Berries of ´ Campbell Early ´ Grapes (V . labruscana B.)
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Abstract
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This study was carried out to clarify growth process, seasonal changes and correlations of chemical composition in leaves, shoots and berries with growth and ripening in `Campbell Early´ grapevines.
The results obtained were as follows.
1. Specific growth rate (SGR) in some quantitative characters of leaves and shoots decreased rapidly until anthesis, thereafter stagnated. SGR of leaf dry weight decreased more rapidly than that of leaf fresh weight at anthesis.
2. Specific leaf area (SLA) was found to be correlated negatively with specific leaf weight (SLW). This result suggested that leaf expansion corresponded with leaf thinning inversely.
3. Growth in berry diameter increased rapidly and almost reached the final size at growth stage I . Cumulative growth curve of berry fresh weight showed a double sigmoid curve and three distinct growth periods ( I , II , III ) were identified. SGR of berry fresh weight showed three peaks.
4. The contents of ash, total nitrogen, and total carbon had little relation with development and ripening of berries, but those of sugar and starch had close relation, viz., they decreased with enlargement and maturity of berries, but increased rapidly after harvest in leaves and shoots. Total sugar decreased with starch increasing coincidently in shoots in November.
5. The content of total carbon reflected the total nutritional condition of grapevine. The contents of total carbon were highly correlated with dry matter contents in leaves and shoots.
6. The contents of total soluble solid and reducing sugar increased rapidly at growth stage III , but the peak of titratable acidity could be seen at two weeks before growth stage III , thereafter decreased rapidly in berries. The contents of titratable acidite, and organic acids showed three peaks, and it was thought that the process of organic acid changes is related with enlargement of berries.
7. Qualitative characters were highly correlated with the ratio of total soluble solid to total acidity in simple correlations, but direct effect by the path-coefficient analysis didn´t coincide with simple correlations. Direct effect of pH was large and that of juice viscosity was negligible, but those of berry-hardness and berry-brightness (value) were large negatively.
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