Carbon Metabolism in Mycorrhiza

IVER JAKOBSEN

Plant Biology Section, Ris0 National Laboratory, DK-4000 Roskilde, Denmark

I. Introduction 149

II. Carbon nutrition of mycorrhizal fungi 150

A. External organic carbon sources 150

B. Carbon transfer from the host 151

C. Carbon metabolism in the mycobiont 153

III. The carbon balance of mycorrhiza 157

A. Photosynthesis 158

B. Shoot/root distribution of carbon 161

C. Carbon consumption by the mycobiont 166

D. Interplant transfer of carbon 171

IV. Carbon costs in relation to nutrient uptake and growth response 172 V. Conclusions 173

References 174

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