Forcing of Rosetted Eustoma grandiflorum Seedlings by Low Temperature Treatments.
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概要
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Recently <I>Eustoma grandiflorum</I> (Raf.) Shinn. has become a popular ornamental cut flower primarily because of its range of flower colors and longevity. Production from June to September accounts for 80% of annual output, with a maximum in July (25%) and only 5% between November and April. New techniques that result in stem elongation and flowerings of rosetted plants have now resulted in a rapid expansion of production in the November to May period. Thus <I>Eustoma</I> is now readily available year-round by using selected cultivars growing in appropriate climatic locations. In warmer areas, high quality flowers (with stem 80 cm +) can now be produced in two flushes from November to June using selected cultivars sown in June and July. But, due to high temperatures, seedlings rosette and stems do not elongate or bolt. To overcome this problem, various methods have been attempted such as artificial cooling of seedlings at night, cultivating seedlings in the cool highlands and shipping them to northern areas. We devised an artificial cooling method to be used on rosetted seedlings. In this way, seeds are greenhouse sown and raised under (naturally) high temperatures (day 25-30°C and night 20-25°C) for 35 to 45-d in order to develop a seedling rosetted. Then these rosetted seedlings are transferred to a cool store at 12±1°C which is illuminated with 5-10μmol/m<SUP>2</SUP>/s commencing at the four-leaf stage for 4-weeks. With this technique the rosette state is broken. With suitable cultivars this precise technique guarantees success and uniformity flowering and consequently it is rapidly being commercially adopted.
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