. The Canadian field-naturalist. 96 The Canadian Field-Naturalist Vol. 100 Table 2. Total shoot length (cm) of five Oxycoccus macrocarpus cultivars grown in a 16-h photoperiod at three temperature regimes in growth chambers at the Kentville Research Station. Light intensity in each chamber was 6800 lux and there were five plants of each cultivar grown from a 20 cm cutting in each chamber. Shoot length was recorded after 57 days. Regime #1 Regime #2 Regime #3 ll°Cindark 16°Cindark 21°C in dark 16°C in light 21°C in light 26°C in light Cultivar (mean ± SE) (mean ± SE) (mean + SE) Black Veil Pilg
. The Canadian field-naturalist. 96 The Canadian Field-Naturalist Vol. 100 Table 2. Total shoot length (cm) of five Oxycoccus macrocarpus cultivars grown in a 16-h photoperiod at three temperature regimes in growth chambers at the Kentville Research Station. Light intensity in each chamber was 6800 lux and there were five plants of each cultivar grown from a 20 cm cutting in each chamber. Shoot length was recorded after 57 days. Regime #1 Regime #2 Regime #3 ll°Cindark 16°Cindark 21°C in dark 16°C in light 21°C in light 26°C in light Cultivar (mean ± SE) (mean ± SE) (mean + SE) Black Veil Pilgrim CN Crowley Bergman + + + + + + + + + ± + + + + + decline until the last week of August, when a marked increase in ethylene occurred (Forsyth and Hall 1969). A dramatic change in rate of respiration just prior to harvest was reported by Forsyth and Hall (1967b). Outward diffusion of CO2 from native seedling cranberries proceeded at a rate of cm"^-hr"' and the movement of O2 into the same was cm~^-hr~' (Forsyth et al. 1973). Hall and Stark (1972) showed that anthocyanin formation in both leaves and fruit was enhanced by decreasing temperature. Rates of photosynthesis were shown by Forsyth and Hall (1967a) to be temperature dependent; however, a low but measurable rate, greater than the rate of respiration, was found even at temperatures as low as °C. This was considered an important factor in preventing oxygen deficiency under the ice during the winter months. Heavy snowfall in winter can reduce light penetration through the ice and prevent photosynthesis by the evergreen leaves. When the oxygen content of the water around submersed leaves falls below 6 ppm, the previous season's leaves drop, fruit set is impaired and shoot apical meristems are severely injured (Bergman. Please note that
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