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Journal of Experimental Botany, Vol. 51, No. 349, pp. 1443-1448, August 2000
© 2000 Oxford University Press

Original Papers

Hydrolytic enzymes and ability of arbuscular mycorrhizal fungi to colonize roots

J.M. Garcia-Garrido, M. Tribak, A. Rejon-Palomares, J.A. Ocampo and I. Garcia-Romera1

Departamento de Microbiología del Suelo y Sistemas Simbioticos, Estación Experimental del Zaidín, CSIC, Prof. Albareda 1, Apdo. 419, E-18008 Granada, Spain

The production of hydrolytic enzymes from external mycelia associated with roots and colonized soybean roots (Glycine max L.) inoculated with different arbuscular-mycorrhizal (AM) fungi of the genus Glomus, and the possible relationship between these activities and the capacity of the AM fungi to colonize plant roots was studied. There were differences in root colonization and plant growth between the Glomus strains, and also between two isolates of G. mosseae. Hydrolytic activities in the root and external mycelia associated with roots differed in the AM fungi tested. Correlations were only found between the endoxyloglucanase activity of the external mycelia associated with roots of the AM fungi tested and the percentage root colonization or plant growth. However, hydrolytic activities of roots colonized by the different endophytes correlated with those of external mycelia. The hydrolytic activities were not qualitatively different because the endoxyloglucanase from AM colonized roots and the external mycelia did not show a high degree of polymorphism in the different species of fungus tested. The possible role of the hydrolytic activity of external hyphae of AM fungi was discussed as a factor affecting fungal ability to colonize the root and influence plant growth.

Key words: Arbuscular mycorrhiza, Glomus sp., Glycine max, hydrolytic enzymes.


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J. M. Garcia-Garrido and J. A. Ocampo
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