シンビジウムのメリクロン幼苗に対する夏期の弱光がその後の生長に及ぼす影響

抄録

This experiment was carried out to determine the effect of low light intensity from May 15 to August 31 (3.5 months) on the growth of mericlonedCymbidiumorchid. In the two cultivars (Cymb. Rose Wine‘Fruity Drop’ andCymb. Great Katty‘Little Louransan’) that were grown under shaded conditions for the period, their fresh weight was lower than the control's, especially the root's, which was more than 50% lower at 3 months after the low-light treatment. The number of leaves and leaf length were also smaller even 1 year after treatment. In regard to leads, shadedCymb. Rose Wine‘Fruity Drop’ showed much reduced development of new lead, and the ratio of plants that developed no lead was also higher in comparison with the control. ForCymb. Great Katty‘Little Louransan, ’ the ratio of plants that developed new leads was not different between the treatment, but their growth was poorer in shaded plant.