ISHS Acta Horticulturae 430: VII International Symposium on Flowerbulbs
EFFECTS OF STORAGE AND TIME ON FLOWER BUD DEVELOPMENT, EMERGENCE AND FLOWERING OF LEUCOCORYNE COQUIMBENSIS. PHIL. |
| Authors: | K. Ohkawa, E. Nitta, Y. Fukawaza, H.H. Kim |
| Abstract:
Leucocoryne a native of Chile has been evaluated. It flowers in early spring with five violet or white flowers which have good keeping-quality. The effects of storage temperature and duration on flower bud development, shoot emergence and anthesis were examined. Bulbs which were stored at 20°C to 30°C for 22 weeks emerged early and produced 3.3–3.5 flower stalks per bulb between March and April. Flowering was most rapid in 20°C-treated bulbs followed by those treated at 25°C and then by 30°C-treated bulbs. We conclude that temperature treatments at 25°C to 30°C release Leucocoryne bulbs from dormancy. After dormancy breaking, flower bud development was most rapid in 20°C-treated bulbs followed by those treated at 25°C and 30°C respectively. Between the stages of androecium initiation and anther and ovule initiation, development was most rapid in 20°C-treated bulbs, while outer perianth initiation stages were fastest in bulbs treated at 30°C before planting. After dormancy breaking by dry storage at 20°C for 16 weeks, two weeks extra dry storage at 15°C before planting resulted in flowering one month earlier with no reduction in the number of flower stalks. Dry storage at 20°C for up to 11 months reduced the days to emergence and flowering. Storage at 20°C for 12 months did not reduce the days because the primary stem dried out and a second stalk subsequently developed into a flowering stem. There was a tendency for the later flower stem to commence flower bud development while the flower bud on the primary flower stalk developed to the stages of gynoecium or anther and ovule initiation. | |
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