Abstract
The rate of apparent photosynthesis of cranberry leaves increased linearly over the temperature range of 3.5° to 25.0 °C when measured manometrically. The same general pattern was found when photosynthesis was measured using an oxygen analyzer. At 3.5, 5.0, 10.0, and 15.0 °C the rate of O2production by photosynthesis was greater than the rate of removal of O2by respiration. Although the excess of oxygen given off to the water is quite small, it is an important factor in winter survival of cranberry plants, especially the meristematic tissues, which are most susceptible to O2deficiency.