Canadian Forest Service Publications

Effect of temperature on dry matter production of Douglas-fir seedlings during bud dormancy. 1969. Brix, H. Canadian Journal of Botany 47(7): 1143-1146.

Year: 1969

Issued by: Pacific Forestry Centre

Catalog ID: 27936

Language: English

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Available from the Journal's Web site.
DOI: 10.1139/b69-158

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Bud dormancy was induced in Douglas-fir seedlings 90 days after seed germination. Dry matter production of bud-dormant plants was determined for a 7-week growth period at five controlled temperatures from 2 to 24 °C. There was no significant temperature effect between 7 and 24 °C on total dry matter production, which at 2 °C was reduced. Dry weight of the root was affected more by temperature than that of the plant top. A pronounced temperature effect on dry matter production was found previously between 13 and 18 °C for plants in the stage of leaf production. This did not occur for bud-dormant plants because temperature effect on leaf production was not present. Net assimilation rates during bud dormancy were generally lower than during the stage of leaf production, especially at low temperature. This may have been caused by a reduced "sink" for use of photosynthates during bud dormancy.