Abstract
Effects of low temperature treatment and plant age on flower bud formation were investigated in Chinese kale with white petals.
1. Flowerbud for mation was promoted by low temperature treatments (10/5°C, light/dark period). Moreover then odenumber decreased following low temperature exposure. The effects were stronger after two weeks of low temperature treatment compared to those after one week. 'Hakushin', 'Kairan-T' and 'Kairan-M' formed flower buds during four weeks of low temperature treatment, and 'Chugoku-kairan', 'Shirobana-kuroba' and 'Kairan-K' formed flower buds after the treatment.
2. Flower buds of 'Hakushin' and 'Kairan-T' were promoted by low temperature treatment one week after sowing. Those of 'Kairan-M', 'Chugoku-kairan', 'Shirobana-kuroba' and 'Kairan-K' were promoted by the treatment two weeks after sowing.
3. Flower buds of 'Hakushin' and 'Kairan-T' were slightly promoted by low temperature treatment of pregerminated seeds. However, the flower buds were more strongly influencd by the growing temperature than the treatment of pregerminated seeds.
