Growth Response of Redwood Seedlings to Thermoperiodism

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Abstract:

Redwood, Sequoia sempervirens (D. Don) Endl., seedlings exhibited optimal growth under controlled conditions of 19°C day temperature and 15°C at night with 8 hours of natural light and 8 hours of low-intensity artificial light. Redwood did not exhibit the marked dependence on a day-night temperature change (thermoperiod) that characterized the responses of other conifers. In fact, at the end of 24 weeks differences in height and diameter growth between the best temperature conditions of a 19°C day with a 15°C night, a 4°C thermoperiod, and a constant 19°C were not significant. Although dry weight production for the total plant was significantly best under a 19°C day with a 15°C night, the constant 19°C day and night, and the 19°C day with a 23°C night were not significantly different from each other. The best growth with a thermoperiod of only 4°C and good growth under constant temperature conditions are in contrast to the requirements previously reported in the literature for good growth of other conifers. A marked decrease in growth occurred when the night temperature was lowered to 11°C from 15°C. This sharp decline was probably due to the inability of one or more of the enzymes to be activated at the lower temperatures.

Document Type: Journal Article

Affiliations: Dept. of Botany, Duke University, Durham, N. C.

Publication date: September 1, 1966

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