Effects of temperature on the gas exchange of leaves in the light and dark

✍ Scribed by G. Hofstra; J. D. Hesketh

• Publisher: Springer-Verlag
• Year: 1969
• Tongue: English
• Weight: 565 KB
• Volume: 85
• Category: Article
• ISSN: 0032-0935
• DOI: 10.1007/bf00389400

✦ Synopsis

Evolution of C02 into CQ-free air was measured in the light and in the dark over a range of temperatures from 15 to 50 ~ Photosynthetic rates were measured in air and O2-free air over the same range of temperatures. Respiration in the light had a different sensitivity to temperature compared with respiration in the dark. At the lower temperatures the rate of respiration in the light was higher than respiration in the dark, whereas at temperatures above 40 ~ the reverse was observed. For any one species the maximum rates of photosynthesis and photorespiration occur at about the same temperature. The maximum rate for dark respiration generally is found at a temperature about 10 ~ higher. Zea mays and Atriplex nummularia showed no enhancement of photosynthesis in 02-free air nor any evolution of C02 in C02-free air at any of the temperatures.