ISHS Acta Horticulturae 673: IX International Symposium on Flower Bulbs
EFFECT OF TEMPERATURE ON FLOWERING OF LACHENALIA RUBIDA (LILIACEAE) |
| Authors: | E. Kodaira, S. Fukai |
| Keywords: | Lachenalia, bulb storage, forcing |
| Abstract:
The growth and flowering habits of Lachenalia rubida were investigated. Inflorescence initiation occurred in early July before planting. Flower primordia at the lowest position of the inflorescence formed tepal primordia in mid-August, stamen primordia in early September, and mature pollen in mid-October, followed by flowering in late November in a greenhouse without heating. This species did not have a low temperature requirement for flowering. Bulbs grown in a greenhouse kept at minimum temperature of 16°C produced elongated and untidy scapes. To reveal the effects of storage temperature, length of storage and time of planting on flowering, bulbs were stored at 5, 10, 15, 20, 25 or 30°C for 13 or 15 weeks from 10 June, and planted in a greenhouse without heating. At the end of storage, inflorescence initiation was observed in all bulbs stored above 20°C. The optimum temperature for floral development was 20°C. The earliest bloom was observed in bulbs stored at 20°C for 15 weeks (around 20 October), while bulbs stored at 20°C for 13 weeks required longer periods to bloom due to higher temperatures after planting in early September. | |
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