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Science 24 July 1981:
Vol. 213. no. 4506, pp. 473 - 474
DOI: 10.1126/science.213.4506.473
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Articles

Carbon Flow in Plant Microbial Associations

E. A. PAUL 1 and R. M. N. KUCEY 2

1 Department of Plant and Soil Biology, University of California, Berkeley 94720
2 Agriculture Canada Research Station, Lethbridge, Alberta T1J 4B1

Measurement of the distribution of the photosynthesis product in the symbiotic association of a legume, a mycorrhizal fungus, and nitrogen-fixing bacteria showed that the fungus incorporated 1 percent of the photosynthesis product and respired 3 percent. The nodules of a 5-week-old plant utilized 7 to 12 percent of the photosynthesis product. The legume compensated in partfor the needs of its microbial partners through increased rates of photosynthesis.

Submitted on December 31, 1980
Revised on March 30, 1981


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