Abstract
Effects of growth temperature and winter duration on leaf longevity were compared between a spring ephemeral, Gagea lutea, and a forest summergreen forb, Maianthemum dilatatum. The plants were grown at day/night temperatures of 25/20°C and 15/10°C after a chilling treatment for variable periods at 2°C. The temperature regime of 25/20°C was much higher than the mean air temperatures for both species in their native habitats. Warm temperature of 25/20°C and/or long chilling treatment shortened leaf longevity in G. lutea, but not in M. dilatatum. The response of G. lutea was consistent with that reported for other spring ephemerals. Air temperature increases as the vegetative season progresses. The decrease in leaf longevity in G. lutea under warm temperature condition ensures leaf senescence in summer, an unfavorable season for its growth. This also implies that early leaf senescence could occur in years with early summers. Warm spring temperatures have been shown to accelerate the leafing-out of forest trees. The decrease in leaf longevity due to warm temperature helps synchronize the period of leaf senescence roughly with the time of the forest canopy leaf-out. Prolonged winter due to late snowmelt has been shown to shorten the vegetative period for spring ephemerals. The decrease in leaf longevity due to long chilling treatment would correspond with this shortened vegetative period.
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Acknowledgments
I thank Dr. L. Lapointe for many invaluable comments on the manuscript. I also thank the staff of Tomakomai Experimental Forests of Hokkaido University for granting permission for sample collection.
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Yoshie, F. Effects of growth temperature and winter duration on leaf phenology of a spring ephemeral (Gagea lutea) and a summergreen forb (Maianthemum dilatatum). J Plant Res 121, 483–492 (2008). https://doi.org/10.1007/s10265-008-0173-9
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DOI: https://doi.org/10.1007/s10265-008-0173-9