気象条件の違いが甲州ブドウの果実成分に与える影響

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  • Correlations between Climatic Conditions and Berry Composition of 'Koshu' (Vitis vinifera) Grape in Japan

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The aim of this study was to elucidate the effects of climatic conditions in three grape-growing regions on ‘Koshu’ (Vitis vinifera) grape composition over a four-year period from 2004 to 2007. Total solar radiation was the highest in Kofu and the total soluble solids (TSS) concentration of grapes grown in this region was higher than those of grapes grown in the other two regions. Katsunuma showed a large difference between average maximum and minimum air temperatures, and anthocyanin concentration in grape skin was the highest. In addition, grape juice had high total phenolics (TP) concentration. Nirasaki had the highest elevation of the three regions tested. Because of this, the maturity of grape berries grown in the Nirasaki vineyard was delayed by a couple of weeks compared to that of grape berries grown in Kofu vineyard. Yeast assimilable nitrogen (YAN) content in grape juice might be not affected by climatic conditions in each growing region. A strong correlation was noted between total solar radiation in August (10 to 13 weeks post-flowering; WPF) and ‘Koshu’ grape composition compared with other climatic conditions, such as rainfall, average air temperature, and the difference between maximum and minimum air temperatures. Moreover, the correlation coefficients between average air temperature and the grape composition in August were also higher than those 14 to 17 WPF (September) and 18 to 20 WPF (October). Thus, climatic conditions in August influenced ‘Koshu’ grape composition. These findings are expected to greatly contribute to the selection of suitable cultivation regions for ‘Koshu’ grape and the improvement of ‘Koshu’ wine quality.<br>

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