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Revista chilena de historia natural

Print version ISSN 0716-078X

Abstract

DE LA ROSA-MERA, CLAUDIA et al. Isolation of arbuscular mycorrhizal fungi consortia from medicinal plants and their effectiveness on growth of vinca (Catharanthus roseus). Rev. chil. hist. nat. [online]. 2012, vol.85, n.2, pp.187-198. ISSN 0716-078X.  http://dx.doi.org/10.4067/S0716-078X2012000200005.

This study consisted on propagating and identifying arbuscular mycorrhizal fungi (AMF) collected from medicinal plants (MP) of natural areas of mixed forest (Estado de Mexico), and selecting mycorrhizal consortia based on the growth promotion of Catharanthus roseus (L) G. Don, medicinal plant whose alkaloids have antineoplasic properties. In the first experimental stage, roots and rhizospheric soil were collected from the 13 MP in which the mycorrhizal colonization percentage (MCP) and the number of spores were assessed; in addition, soil samples were used for establishing culture traps under greenhouse conditions for 10 months and thus, the main AMF genera were identified. All MP showed AMF colonization, and four fungal genera were identified (Glomus, Acaulospora, Gigaspora, and Scutellospora) from which Acaulospora and Glomus were predominant. The second experimental stage allowed the selection of eight consortia based on the MCP of trap cultures (> 40 %), that corresponded to samples collected from Adiantum capillus-veneris L., Castilleja tenuiflora Benth., Erigeron karvinskianus DC., Pimpinella anisum L., Plantago major L., Ricinus communis L., Rubus fruticosus L. and Rumex mexicanus Meisn. These consortia were inoculated to C. roseus to evaluate their capability for stimulating the plant growth under greenhouse conditions. After 70 days, in spite of presenting only one predominant AMF genus (Glomus), the consortium isolated from R. mexicanus showed more consistent effects on the growth of C. roseus (leaves number, leaf area and leaf dry weight) when compared to the remaining mycorrhizal consortia.

Keywords : culture trap; medicinal plant; mycorrhizal colonization; mycorrhizal symbiosis; selection of mycorrhizal fungi.

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