Bud dormancy and vegetative growth in Salix polaris as affected by temperature and photoperiod |
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Authors: | Espen Paus Jarle Nilsen Olavi Junttila |
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Institution: | (1) Institute of Biology and Geology, University of Tromsø, Guleng, Box 3085, N-9001 Tromsø, Norway |
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Abstract: | Summary Vegetative growth of two ecotypes (lat. 78° 15 N and 69°37 N) of Salix polaris L. was studied in phytotron experiments. Dormancy of the winter buds was broken by chilling at 0.5°C for 14 to 42 days. Chilling requirement increased with decreasing growth temperature. The optimum temperature for bud break and shoot growth was about 15°C for both ecotypes. Cessation of apical shoot growth and abscission of shoot tip was not prevented by long photoperiods. However, at high temperature, 15°C or more, and in 18 to 24 h photoperiod, two or three growth flushes occurred frequently in both ecotypes. Leaf abscission in the arctic ecotype from lat. 78°N was not affected by photoperiod when grown at 6°C, but was stimulated by short photoperiod when grown at 15°C. In the ecotype from lat. 69°N leaf abscission was enhanced by short photoperiod even at 6°C. |
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