Diffusion of Gases through Plant Tissues : Entry of Acetylene into Legume Nodules |
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| Authors: | Davis L C |
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| Affiliation: | Department of Biochemistry, Kansas State University, Manhattan, Kansas 66506. |
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| Abstract: | I have measured acetylene diffusion through plant tissues including nodules from several species of legume—vetch, peas, soybeans, and Sesbania rostrata. The observed half-time for reequilibration of internal and external concentration is less than 1 minute for typical nodules. Inward diffusion of acetylene in air is rapid relative to the use of acetylene by nitrogenase so that diffusion of acetylene would not be a significant limiting factor for nitrogenase activity in air. However, under an atmosphere of Ar:O2 where there is no N2 reduction, the inward diffusion rate of acetylene into larger nodules could produce a measurable limitation of observed nitrogenase activity at low acetylene concentrations. |
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