Studies on Dry Matter Production and Leaf Area Expansion of Kudzu Vines (Pueraria lobata Ohwi) : II. The difference in dry matter and leaf area productivity between the main stem and the branches of the current year's stem

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  • クズの乾物生産ならびに葉面積の拡大に関する研究 : II.当年茎の乾物ならびに葉面積生産性における主茎と分枝の差異
  • クズの乾物生産ならびに葉面積の拡大に関する研究-2-当年茎の乾物ならびに葉面積生産性における主茎と分枝の差異
  • クズ ノ カンブツ セイサン ナラビニ ヨウメンセキ ノ カクダイ ニカンスル

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A comparison of the dry matter and leaf area productivity between the main stem and the branches of the current year's stem was made in this investigation. Dry matter and leaf area production in the current year's stem were brought about by only the main stem until early May, and by both the main stem and the 1st order branches in early June. The 2nd and 3rd order branches took part in dry matter and leaf area production after early July and the 4th order branches from early October onward. As to stem dry weight partitioning between the main stem and the branches of the current year's stem (Table 1), the main stem had a maximum dry weight and higher order branches had smaller dry weights at all times. From the results obtained about stem dry weight/stem length ratio (Table 6), it was supposed that stem dry weight partitioning above mentioned was related to more pronounced thickening and lignification of the main stem as compared with the branches, and of lower order branches as compared with higher order ones. Concerning leaf (leaflet+petiole) dry weight partitioning between the main stem and the branches (Table 2), the main stem had a maximum weight and higher order branches had smaller weight until early August. However, leaf dry weight of the main stem was less than that of the 1st order branches in early September and that of the 2nd order branches in early October. Leaf dry weight of the main stem decreased to less than 17% in early November. From the results obtained about the numeric proportion of nodes with leaves to the total nodes (Table 5) and leaf dry weight or leaf area/stem length ratio (Table 7, 8), it was supposed that the seasonal variation in leaf dry weight partitioning between the main stem and the branches as mentioned above could be attributed to the differences in the time of leaf appearance and leaf fall and the ability to produce leaves. Flower clusters emerged from July onward. There was no formation of flower clusters on the 4th order branches. Concerning dry weight partitioning of flower clusters between the main stem and the branches (Table 3), the flower cluster dry weight which emerged from the 1st and 2nd order branches reached more than 90% at all times. The seasonal change in leaf area partitioning between the main stem and the branches was recognized to be similar to that in leaf dry weight (Table 4).

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