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Estimated Freezing Tolerance and Long Term Storage at -1.5 to -2.0℃ and under Controlled Atmosphere in Lily Bulbs

百合球茎在-1.5至-2.0℃和受控气氛下的估计冷冻耐受性和长期储存

基本信息

批准号：
13460017
负责人：
IMANISHI Hideo
金额：
$ 4.22万
依托单位：
Tokyo University of Agriculture (2002-2003)Osaka Prefecture University (2001)
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2003
项目状态：
已结题

项目摘要

Changes in freezing tolerance of lily bulbs were examined during storage at -2℃ for long term using cultivars belong to 4 hybrid groups. Estimated median lethal temperature (LT50) of shoots became higher with increasing storage period of bulbs at -2℃ in 'Le Reve', 'Hinomoto' and 'Connecticut King'. In 'Turandot', estimated LT50 was almost constant. But estimated LT50 in 'Connecticut King' and 'Turandot' was still low after 10 months storage of bulbs at -2℃. All bulbs of these 2 cultivars were alive, while some bulbs of other 2 cultivars were already dead after 10 months storage at -2℃. These results indicate that freezing tolerance of shoots tended to decline with prolonged storage at -2℃.The number of flowers decreased and aborted or blind flowers and necrosis of tips of leaves were observed when bulbs of 'Casa Blanca' were planted after the storage at -1.5℃ or -2.0℃ for more than 7 months. On the other hand, such injury was not observed in bulbs of 'Ceb Dazzle' even if they were planted after the storage for 11 months.When bulbs of 'Casa Blanca' were hardened at 1℃ for 4 to 8 weeks or at 12℃ for 8 weeks followed by 1℃ for 8 weeks before moving to long term storage at -1.5℃ or -2.0℃, sugar contents of scales and stems increased. Cut flowers with high quality were obtained when they were grown in a glasshouse maintained at minimum temperature of 15℃. Stems elongated and sugar content of stems decreased when bulbs were hardened at 1℃ for more than 12 weeks and dead stems were observed after the long term storage.When lily bulbs of 3 hybrid groups were stored at -1.5℃ for 9 months under ambient atmosphere conditions or a controlled atmosphere condition (CA) kept at low oxygen concentration of 2-3%, only bulbs of 'Connecticut King' stored at CA condition resulted in higher flowering percentage and improved cut flower quality.

以4个百合杂交种为材料，研究了百合种球在-2℃长期贮藏过程中的抗冻性变化。在-2℃贮藏条件下，‘Le Reve’、‘Hinomoto’和‘Connecticut King’鳞茎的估计半致死温度（LT_（50））随贮藏时间的延长而升高。在“图兰朵”中，估计的LT 50几乎是恒定的。但在-2℃下贮藏10个月后，‘康涅狄格王’和‘图兰朵’的LT 50估计值仍然很低。在-2℃下贮藏10个月后，这2个品种的鳞茎全部成活，而另外2个品种的鳞茎部分死亡。结果表明，随着-2 ℃贮藏时间的延长，“卡萨布兰卡”鳞茎的耐冻性呈下降趋势，在-1.5℃或-2.0℃贮藏7个月以上，其开花数减少，出现败花或盲花，叶尖坏死。另一方面，“CebDazzle”种球即使在贮藏11个月后种植，也没有观察到这种伤害。“Casa Blanca”种球在1℃下硬化4 ~ 8周或在12℃下硬化8周后再在1℃下硬化8周，然后转移到-1.5℃或-2.0℃下长期贮藏，鳞片和茎的糖含量增加。在最低温度为15℃的温室中，可获得高品质的切花。百合种球在1℃下贮藏12周以上，茎伸长，含糖量下降，长期贮藏后出现死茎，3个杂交组合的种球在常温或低氧条件下贮藏9个月，只有‘康涅狄格王’种球在气调贮藏条件下开花率高，切花品质好。