枝の添伸成長に伴うミズキの葉の生産性と冬芽形成

概要

論文の詳細を見る
Winter buds of Cornus controversa are known to develop to first-order shoots, whose axillary buds sometimes elongate one or two second-order shoots. Such a twig growth pattern can form fifth-order shoots. In a man-made Cryptomeria japonica stand, current-year twigs of C. controversa had a larger total leaf area and shorter mean leaf longevity when under higher relative light intensity. This shorter mean leaf longevity resulted from a much shorter longevity of leaves on higher-order shoots, which were often produced by twigs under higher relative light intensity. Nitrogen content per unit area or unit dry weight of leaf was larger in higher-order shoots, suggesting a higher photosynthetic ability of such leaves. The size of winter buds per total leaf area per shoot on the higher-order shoots exceeded than that on first-order shoots. Mean number of leaves in winter buds of S3 twigs (first to third shoots) was largest on the first-order shoots. However that of S5 twigs (first to fifth shoots) was not different between first- and fourth- or fifth-order shoots. These facts suggest that the leaves of higher-order shoots have higher photosynthetic ability and make winter buds more efficiently than first-order shoots.
日本生態学会の論文
1995-12-20