1997 Volume 66 Issue 3-4 Pages 597-605
Hybrid seedlings of Miltonia 'Spring Cynthia'×X Milt. vexillaria (Miltoniopsis Nichols.)and 'Sein Ida Seigel' × 'Mein Ida Seigel' were grown at Dando-san, Aichi, at about 700 melevation (highland culture) and at Fujisawa, Kanagawa, near sea level (lowland culture)during the summer to investigate the effect of growing temperature. Some bulbs were ex-posed to 15 °C under a 16-hr photoperiod and a light intensity of 20 μmol•m-2•sec-1 for 40 days, whereas others were kept at room temperature under natural photoperiod andlight intensity prior to planting.
1. Although there were seedling varaiations within the crosses, bulbs grown under high-land culture in August bloomed 10 or more day earlier, produced more scapes, and moreflowers per scape than did bulbs grown under lowland culture.
2. The growth and flowering of Miltonia cultivars were accelerated by artificially chillingthe plants for 40 days in the growth chambers prior to planting.
Thus, by growing different seedling selections at the lowland and highland sites, withand without artical chiling, the maketing period of Miltonia could be prolonged in Japan.