花芽のageが促成チューリップの生育・開花に及ぼす影響(第1報) : 冷蔵開始時の花芽のageが開花および切花形質に及ぼす影響

抄録・要旨

To make clear the effect of age of flower bud at the start of precooling on the time of flowering and the quality of cut flower, tulip bulbs of a cultivar, "Trance" were storaged for various intervals at 0℃ and 22℃ before precooling.
1 ) As the storage at 22℃ was prolonged, the age of flower bud was more progressive and the nose became longer at the start of precooling. A regression equation of Y=1.16X-0.53 (r=0.98***) was obtained between the nose length (Y) and the storage period (X). The floral organ did not completely develop in the tulip bulbs storaged at 22℃ for 4 weeks or less.
2 ) The weight of nose at planting increased with the age of the nose. The nose became longest when a bulb was storaged at 22℃ for 6 weeks.
3 ) Younger bulbs storaged at 22℃ for 2 or 4 weeks required the least days for flowering under forcing, followed by older bulbs storaged for 9 weeks.
4 ) The quality of cut flower was satisfactory for marketing when bulbs were storaged at 22℃ for longer than 5 weeks and the nose length exceeded 5 mm at the start of precooling. Even if the nose was shorter than 5 mm, bulbs with completely developed floral organ were acceptable for the cut flower production under forcing.