STUDIES ON FLOWER-BUD DIFFERENTIATION AND FORCING OF BLUEBERRY

1994 Fiscal Year Final Research Report Summary

• Project/Area Number: 05660033
• Research Category: Grant-in-Aid for General Scientific Research (C)
• Allocation Type: Single-year Grants
• Research Field: 園芸・造園学
• Research Institution: SHIMANE UNIVERSITY
• Principal Investigator: UEDA Hisafumi Shimane University FACULTY OF AGRICULTURE.PROFESSOR., 農学部, 教授 (70032571)
• Co-Investigator(Kenkyū-buntansha): AOKI Noriaki Shimane University FACULTY OF AGRICULTURE.ASSOCIATE PROFESSOR., 農学部, 助教授 (40032651)
• Project Period (FY): 1993 – 1994
• Keywords: Blueberry / Forcing / Cut branch / Rate of flowering / Flower-bud differentiation / Breaking of dormancy / Duration of cold treatment

Research Abstract

An early cultivar of highbush blueberry( 'Northland' ) began its flower-bud differentiation in early June and attained to the period of pistil formation in early and middle July. The times of flower-bud initiation and pistil formation in an early cultivar of rabbiteye blueberry ( 'Woodard' ) were about 2 months later, respectively, than those in the cultivar of highbush blueberry. The effects of the sampling date of branches having flower buds and those of the time and duration of a cold treatment (4ﾟC) on the rate of lowering were examined in the cultivar of highbush blueberry. when the branches were sampled in middle October and received the cold treatment for more than 30 days, the rate of flowering attained to more than 50 % in late December. The effects of the time and duration of the cold treatment on the rate of flowering were compared using potted plants among 4 cultivars of highbush blueberry ( 'Northland' , 'Rancocas' , 'Jersey' and 'Darrow' ). 'Darrow' and 'Northland' showed the higher rates of flowering in the shorter duration of the cold treatment than 'Rancocas' and 'Jersey'.