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The Scientific World Journal
Volume 2012, Article ID 374091, 8 pages
http://dx.doi.org/10.1100/2012/374091
Research Article

Dual Inoculation with Mycorrhizal and Saprotrophic Fungi Applicable in Sustainable Cultivation Improves the Yield and Nutritive Value of Onion

1Department of Experimental Plant Biology, Faculty of Science, Charles University in Prague, 12844 Vinicna 5, Czech Republic
2Institute of Botany of the Academy of Sciences of the Czech Republic, 25243 Pruhonice, Czech Republic
3Symbiom Ltd., Sazava 170, 56301 Lanskroun, Czech Republic
4Department of Vegetable Sciences and Floriculture, Mendel University in Brno, Valticka 337, 69144 Lednice, Czech Republic
5Microbiology and Environmental Toxicology Group, Plant Protection Institute, Szent István University, 2100 Gödöllő, Hungary

Received 19 October 2011; Accepted 25 December 2011

Academic Editors: O. K. Douro Kpindou, A. Ferrante, R. L. Jarret, and A. Roldán Garrigós

Copyright © 2012 Jana Albrechtova et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The aim of this paper was to test the use of dual microbial inoculation with mycorrhizal and saprotrophic fungi in onion cultivation to enhance yield while maintaining or improving the nutritional quality of onion bulbs. Treatments were two-factorial: (1) arbuscular mycorrhizal fungi (AMF): the mix corresponding to fungal part of commercial product Symbivit (Glomus etunicatum, G. microaggregatum, G. intraradices, G. claroideum, G. mosseae, and G. geosporum) (M1) or the single-fungus inoculum of G. intraradices BEG140 (M2) and (2) bark chips preinoculated with saprotrophic fungi (mix of Gymnopilus sp., Agrocybe praecox, and Marasmius androsaceus) (S). The growth response of onion was the highest for the M1 mix treatment, reaching nearly 100% increase in bulb fresh weight. The effectiveness of dual inoculation was proved by more than 50% increase. We observed a strong correlation ( 𝑟 = 0 . 8 3 ) between the growth response of onion bulbs and AM colonization. All inoculation treatments but the single-fungus one enhanced significantly the total antioxidant capacity of bulb biomass, was the highest values being found for M1, S + M 1 , and S + M 2 . We observed some induced enhancement of the contents of mineral elements in bulb tissue (Mg and K contents for the M2 and M2, S, and S + M 2 treatments, resp.).