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Journal of Experimental Botany, Vol 49, 707-711, Copyright © 1998 by Oxford University Press

ARTICLES

Enhanced growth of non-photosynthesizing tobacco mutants in the presence of a mycorrhizal inoculum

J Muller and H Dulieu
Station de Genetique et d'Amelioration des Plantes, BV 1540, F-21034 Dijon, France; Present and corresponding address: Botanisches Institut, Hebelstrasse 1, CH-4056 Basel, Switzerland; e-mail: muellerjo@ubaclu.univbas.ch

The symbiosis between higher plants and arbuscular mycorrhizal fungi (AMF) is generally thought to improve the mineral nutrition of many plants. Moreover, AMF seem to play a role in transferring assimilated carbon between plants. To answer the question whether this carbon transfer could be sufficient to enhance the growth of non-assimilating plants, tobacco wild-type plants and non-photosynthesizing mutants were co-cultivated in the presence and absence of a mycorrhizal inoculum. Newly formed leaves were counted and biomass was determined at the final harvest. The mycorrhizal infection was determined in the roots. When the mutants were co-cultivated with a wild-type plant in the presence of a mycorrhizal inoculum, leaf number and the shoot biomass were significantly higher than in etiolated plants co-cultivated with wild-type plants without AMF or with etiolated plants alone.Keywords: Arbuscular mycorrhiza, carbon transfer, growth enhancement, symbiosis.
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