Canadian Forest Service Publications
Influence of photoperiod and temperature on growth, gas exchange, and cold-hardiness of yellow cypress stecklings. 1994. Puttonen, P.; Arnott, J.T. Canadian Journal of Forest Research 24: 1608-1616.
Issued by: Pacific Forestry Centre
Catalog ID: 3553
CFS Availability: Order paper copy (free)
Yellow cypress (Chamaecyparis nootkatensis (D. Don) Spach) stecklings (rooted cuttings) were acclimated for approximately 8 weeks under one of the following photoperiod-temperature treatments: 18 h/10°C, 18 h/20°C, 9 h/10°C, 9 h/20°C followed by deacclimation in a common environment of 12 h/20°C for approximately 6 weeks. During acclimation and deacclimation, steckling morphological development, net photosynthesis, transpiration and leaf conductance, and midday shoot water potential were measured. Hardiness was determined by freeze-induced electrolyte leakage. Shoot growth was reduced more by short photoperiods (9 h) than by cool temperature (10°C) as were net photosynthesis, stomatal conductance, transpiration, and photosynthetic efficiency. Photoperiod-induced cold hardening of shoots and height growth cessation were reversible in warm temperatures (20°C) and 12-h days, indicating that hardiness induction treatments had no lasting effects on the growth or cold hardiness of this tree species.