Dormancy of alpine and subalpine perennial forbs |
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Authors: | Fumio Yoshie |
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Institution: | (1) Biological Laboratory, Institute of Natural Sciences, Senshu University, Higashi-mita, Tama-ku, Kawasaki 214-8580, Japan |
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Abstract: | Depth of dormancy of alpine and subalpine perennial forbs in autumn was investigated, which was judged by the number of days
required for growth initiation at 24 °C. The depth of dormancy differed depending on Raunkiaer’s life-form and shoot habits.
Chamaephytes with perennial shoot-axes showed shallower dormancy than hemicryptophytes with annual shoot-axes, and geophytes
with annual shoot-axes showed the deepest dormancy. The results strongly suggest that the dormancy is more endogenously controlled
in forbs less hardy to freezing stress. Potential growth ability of alpine herbaceous chamaephytes in autumn is an adaptive
advantage, since they utilize the short vegetative period as long as possible. All of the species with annual shoot-axes had
winter buds covered with scales. In plants with perennial shoot-axes, percentage of winter buds covered with scales increased
with increasing depth of dormancy. The results indicate that the shoot apices are well protected by bud scales in forbs with
a long endogeneous-dormant period. |
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Keywords: | Alpine plants Bud scale Frost hardiness Raunkiaer’ s life-form Shoot habit |
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