Journal Article

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‐Romera

in Journal of Experimental Botany

Volume 51, issue 349, pages 1443-1448
Published in print August 2000 | ISSN: 0022-0957
Published online August 2000 | e-ISSN: 1460-2431 | DOI:
Hydrolytic enzymes and ability of arbuscular mycorrhizal fungi to colonize roots

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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.

Keywords: Arbuscular mycorrhiza; Glomus sp.; Glycine max; hydrolytic enzymes.

Journal Article.  4196 words.  Illustrated.

Subjects: Plant Sciences and Forestry

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