カンショの茎葉部における分枝系の発達とその品種間差

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  • カンショ ノ ケイ ヨウブ ニ オケル ブンシケイ ノ ハッタツ ト ソノ ヒンシュ カンサ
  • The Morphology of the Sweet Potato Canopy and its Varietal Differences

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This experiment was carried out to present a quantitative analysis of the branching pattern of the sweet potato plant and its varietal differences. Two cultivars were compared. There was no difference in total dry matter production (DMP) between these two cultivars. However, the tuberous DMP was higher in Shiroyutaka than in Beniazuma through the growth period, and the top DMP showed the opposite tendency. Based on growth analysis, crop growth rate (CGR) in Shiroyutaka was higher than in Beniazuma, especially at the middle growth period. This high CGR in Shiroyutaka was brought about by its large net assimilation rate (NAR), instead of its leaf area index (LAI). Branching characteristics in the top were different between the two cultivars, varying not in number but in length. In Shiroyutaka, branching ability was very high, but the elongation of each branch was relatively limited. Characteristics opposite to these were seen in Beniazuma. Thus, we can describe the different types of canopy architecture observed in the two cultivers as a 'gathering-type' in the case of Shiroyutaka and a 'dispersing-type' in the case of Beniazuma. Moreover, it is suggested that the canopy types might effect the NAR of each cultivar.

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