EXPANSION OF TEMPERATURE RANGE FOR FLOWER BUD INITIATION AND PREVENTION OF REST IN HYDRANGEA

日本夏季的绣球花（Hydrangea macrophylla f.hortensia）花蕾形成后的花朵和前一年的休息时间。我们试图通过控制绣球花蕾的萌发和休养来制定绣球秋冬运输的程序。对于一些在秋天休息的花，有人认为夏季的高温会促使它们休息。有一些花，比如柳堇，它们的休息显然是受夏季环境的影响。虽然我们在夏天将绣球存放在3 ~ 5个<s:1>°C的温度以避免休息，但绣球进入休息状态只是延迟了它的开始。另一项试验表明，秋季较低的温度和较短的日照直接诱导了绣球花的剩余。盛田昭夫出版社。（1978）报道了水仙草在温室里从冬天生长到春天时开始开花，经过一些冷藏后在秋天开花。然而，由于绣球花在春季发芽并不总是成功，因此该方案并未在绣球生产中使用。我们尝试将绣球花的幼芽培养到足以形成花芽的大小，然后用生长调节剂帕克布托唑处理。结果我们认识到所有的植物都有花蕾。但是，我们遇到了花蕾不发育的严重问题。冷藏后花蕾虽有发育，但开花不均匀，花序较差。因此，需要进一步研究绣球花秋冬运输控制花期和休养的方法。

Hydrangea (Hydrangea macrophylla f.hortensia) flowers in summer in Japan after flower bud initiation and rest of the previous year. We tried to make programs for autumn or winter shipping of hydrangea by controlling its flower bud initiation and rest.1. For some flowers which fall in rest in autumn, it has been suggested high temperature in summer induces their rest. There are flowers like liatris in which rest is clearly induced with summer environments. Although we storaged hydrangeas at 3 to 5ﾟC in summer for avoiding the rest, they fell into rest only showing the delay of its start. And in another experiment it was showed that the rest of hydrangea was induced directly by relatively cool temperature and short daylength which occur in autumn.2. Morita et.al. (1978) reported that hydragea initiated flower bud in spring when they grew from winter in the green house, and they flowered in autumn after some cool storage. However the program had not been used in hydrangea production because their flower bud initiation in spring were not always successful.We tried to grow the shoots of hydrangea large enough capable of initiating flower bud and then treated growth retardant, Pacrobutorazol. In result we recognized that all of plants initiated flower buds. But, we encountered with severe problems in which the flower buds did not develop. Although flower buds developed after cool storage, they did not flower uniformly and bore poor inflorescence.Thus further study is needed to find proper methods of controlling flowering and rest for autumn or winter shipping of hydrangea.