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Rates of C2H2 reduction and CO2 evolution by nodules were measured in a flowthrough system using intact plants of Myrica gale L. Both activities increased linearly with increasing partial pressure of O2 (pO2) up to 18 kPa. The linear relationship between CO2 evolution and pO2 at pO2 values between 6 and 18 kPa suggests that the diffusion barrier has a constant resistance. The lack of a variable resistance was further supported by sustained increases and decreases in nodule activities in response to changes in pO2 in the range of 6 to 20 kPa O2. When pO2 was increased above 20 kPa, C2H2 reduction and CO2 evolution continually declined with time. These results confirm that the diffusion barrier in nodules of M. gale is not variable in response to changes in pO2. The effect of temperature was examined at 8 and 20 kPa O2. Rates of C2H2 reduction and CO2 evolution increased with increasing temperature from 10 to 30[deg]C at both pO2 values. These results indicate that the diffusion resistance of the barrier changes as temperature changes, with the resistance decreasing as temperature increases.

The Resistance of the Diffusion Barrier in Nodules of Myrica gale L. Changes in Response to Temperature but Not to Partial Pressure of O2