マサキの緑枝挿しの発根における光の役割

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Some experiments were carried out to evaluate the role of light in rooting of softwood cuttings in Euonymus japonicus Thunb., The results were summarized as follows.1. Among the cuttings grown under different light intensities by shading with different number of layers of cheesecloth during the propagation period, almost no difference in rooting percentage was found, while both the number and weight of roots per cutting were reduced with lowering light intensities.2. Cuttings were placed in the dark at different times during the propagation period, and at the same time a half of them were defoliated and disbudded. When the treatment was started earlier than 14 days after planting, distinct differences in rooting percentage were found between the cuttings with and without leaves and buds. This fact indicates that functions of the leaves and buds other than photosynthesis may exert a significant influence on rooting percentage at the earlier stage of propagation.3. When the treatment was started later, the number and weight of roots became greater in both cuttings with and without leaves and buds, although the values were usually much larger in the former cuttings than in the latter ones. This fact suggests that root development is promoted by lighting and affected by functions of the leaves and buds other than photosynthesis throughout the propagation period.4. To clarify the role of photosynthesis in rooting, the effects of removal of carbon dioxide from the air during the first half and/or the latter half of the propagation period on rooting were obseved. As a result, it is clear that photosynthesis hardly affects rooting percentage, but has an important role in root development during the latter half of the propagation period.
園藝學會の論文

マサキの緑枝挿しの発根における光の役割

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