Lavandula*intermedia is a Vernalization Type Plant
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概要
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<I>Lavandula</I> × <I>intermedia </I>is cultivated as an ornamental plant in Japan but its fiowering characteristics have not been elucidated. So, a series of experiments were conducted to determine the infiuence of cold treatment and day length on fiowering. An exposure to a 14-week cold treatment (CT) under natural winter condition induced fiowering. An increasing duration of day length was associated with an increase in fiowering rates and with a decrease in days to the first visible bud (VB) and the first open fiower (FLW). This suggests that <I>L.</I> × <I>intermedia </I>may be an essential quantitative long-day plant. When the plants were treated with a low temperature in a cold room at 5°C, a 10-week CT resulted in perfect fiowering. Plants without CT and plants after a 6-week CT did not initiate fioral buds. An increasing duration of CT was also associated with an increase in the rate of fiowering shoots and with a decrease in days to VB and FLW. Thus, exposure to a period of low temperature is the primary factor promoting fiowering in <I>L.</I> × <I>intermedia</I>. Apical dissections and scanning electron microscope (SEM) observations showed vegetative meristems at the end of a 10-week CT at 5°C. Then, dome formation and sepal initiation of the first fioret of each shoot apex were observed at 7 and 21 days after CT, respectively. This suggests that <I>L.</I> × <I>intermedia </I>is a so-called “after effect” fiowering plant. Thus, we conclude that <I>L.</I> × <I>intermedia</I> is a typical vernalization type plant.
著者
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Koshioka Masaji
Department Of Applied Physiology National Research Institute Of Vegetables Ornamental Plants And Tea
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Yoneda Kazuo
Department Of Floriculture And Ornamental Horticulture College Of Bioresource Sciences Nihon Univers
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Kubota Satoshi
Department Of Agriculture Kochi University
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YONEDA Kazuo
Department of Plant Science and Resources, College of Bioresource Sciences, Nihon University
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MOMOSE Hirofumi
Department of Plant Science and Resources, College of Bioresource Sciences, Nihon University
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