Effects of growth temperature and chilling duration on leaf phenology of <Emphasis Type="Italic">Fauria crista</Emphasis>-<Emphasis Type="Italic">galli</Emphasis> subsp. <Emphasis Type="Italic">japonica</Emphasis>, an alpine snowbed geophyte |
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Authors: | Fumio Yoshie |
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Institution: | (1) Institute of Natural Sciences, Senshu University, Higashi-mita, Tama-ku, Kawasaki 214-8580, Japan |
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Abstract: | I examined the effects of growth temperature and winter duration on the leaf phenology of Fauria crista-galli plants, which have an indeterminate growth habit. After a 220-day chilling treatment, the leaf expansion and green periods
of plants maintained at 25/20°C were much longer than those of plants maintained at 15/10°C and of plants at the natural habitat
obtained in a previous study. The results indicate that early growth cessation and early leaf senescence in the natural habitat
are not only due to endogenous rhythm but determined to some extent by cool summer temperatures. When grown at 15/10°C, the
green period of individual leaves and plants was much shorter after a long chilling treatment (220 days) than after a short
chilling treatment (110 days). The plants sprouted during or immediately after the termination of chilling treatment, suggesting
that the decrease in the green period results partly from an advance of endogenous developmental stages during the chilling
treatment and that the timing of snowmelt potentially affects the time of leaf senescence in the natural habitat. |
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