| Project/Area Number |
07456022
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
園芸・造園学
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| Research Institution | Osaka Prefecture University |
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Principal Investigator |
IMANISHI Hideo Osaka Prefecture University, College of Agriculture, Professor, 農学部, 教授 (20081549)
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| Co-Investigator(Kenkyū-buntansha) |
OHKI Satoshi Osaka Prefecture University, College of Agriculture, Asso.Professor, 農学部, 助教授 (00128761)
MORI Genjiro Osaka Prefecture University, College of Agriculture, Asso.Professor, 農学部, 助教授 (20081515)
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| Project Period (FY) |
1995 – 1997
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| Project Status |
Completed (Fiscal Year 1997)
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| Budget Amount *help |
¥5,000,000 (Direct Cost: ¥5,000,000)
Fiscal Year 1997: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1996: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1995: ¥3,200,000 (Direct Cost: ¥3,200,000)
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| Keywords | Easter lily / sleeper occurrence / harvesting time / dry storage / chilling / hot water treatment / 高温処理 |
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| Research Abstract |
The present experiments were carried out to determine the relationship between depth of dormancy and sleeper occurrence after chilling and also to know factors involved in sleeper occurrence, using Hinomoto' bulbs produced in Okinoerabu Islands. Bulbs harvested at different times of the season were sprouted at 20ﾟC to determine the depth of dormancy. To determine sleeper occurrence, bulbs were chilled at 9ﾟC for 6 weeks and allowed to sprout at 20ﾟC.
Bulbs which were harvested later in the season sprouted at a higher percentage frequency and quicker at 20ﾟC.This sprouting pattern indicated that the depth of dormancy decreased with delaying harvest time. Bulbs which were harvested around June 10 and chilled, did not sprout and became sleeper. The season around June 10 was earliest harvesting time in Okinoerabu Islands. These results indicate that there was no relationship between depth of dormancy and sleeper occurrence.
Bulbs which were harvested later in the season were stored dry at 9, 20, and 25ﾟC for two weeks and then chilled at 9ﾟC under a moist oondition. The bulbs did not sprout after being moved to 20ﾟC ; they became sleeper. After two weeks of dry-storage, subjecting bulbs to 2 to 12ﾟC for 2-3 weeks and then transferring them to 15ﾟC or higher induced them to become sleeper.
In bulbs dry-stored at 25ﾟC for two weeks, leaf primordia differentiated into scales when transferred to 20ﾟC after chilling at 9ﾟC, whereas in bulbs kept moist at 25ﾟC for two weeks, they differentiated into foliage leaves during chilling.
Soaking bulbs in 45-46ﾟC water for 1 hour after dry storage did not improve their sprouting percentage, whereas dipping the bulbs in hot water before dry storage or after early harvesting promoted sprouting.
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