Effect of Temperature on the Colouring of Leaves in Ornamental Kale (Brassica oleracea L. var. acephala DC.)

概要

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1. Ornamental kale grown in the field of our college, both of white and red cultivars, began to produce coloured leaves around mid-October, irrespective of plant size, when the mean temperature drops below 15℃. The beginning of leaf coloration preceded to flower initiation. The earlier the planting the larger the plants. The final growth was destined by the duration of period from planting to coloration. 2. Growth cabinet studies showed that the coloration was induced when the plants were kept at 15℃ and arrested at 20℃. Further investigations indicated that it was not a drop in soil temperature but in air temperature that induced leaf coloration. 3. The falling of temperature results in a sharp decrease in chlorophyll content in a developing leaf of white cultivar and a rapid increase in anthocyanin accompanied with the chlorophyll depression in the red one, and this brings out the leaf coloration. 4. Matured green leaves did not change the colour when they were given low temperature, and only the leaves that were opening or had recently opened reverted to green after returning to high temperature. This shows that the temperature only affects the leaf colour in early stages of leaf development.
大阪府立大学の論文
1975-03-31