Abstract
In the last decades, there has been a tendency towards sustainable agriculture. Following this trend, edaphic
fungi as Trichoderma and arbuscular mycorrhizal fungi (AMF) could increase plant growth contributing to
diminish agricultural chemical supply. However, little information exists in current research regarding the possible
effects of alternative practices to soybean monoculture systems on fungal groups that could contribute to plant
health and/or productivity. Thus, our objective was to assess changes in the abundance and diversity of indigenous
AMF and Trichoderma from a long-term field experiment located in the Argentinean Pampas, in order to test the
effect of alternative practices to soybean monoculture. The fungal ability to promote the growth of crops, such us
tomato plant was also tested. Soil samples were collected from a soybean monoculture system (Sb), a system
including cover crop (Avena sativa) followed by soybean (CC/Sb) and a system including rotations (rot) of SoybeanMaize-Wheat crops CC/Sb-rot, M-rot and W-rot, respectively. Highest AMF and Trichoderma abundance was found
at W-rot and M-rot systems, and highest AMF diversity was found at W-rot and CC systems. Furthermore, highest
mycorrhizal colonization was found at CC/Sb and W-rot systems. Inoculated plants with single AMF consortium or
with Trichoderma strains showed significant increases in comparison with the control. Dual inoculation increased
tomato plant growth as compared to the control, and evidence of synergism was found by increases in shoot and
root growth. Our results show that dual inoculation with indigenous AMF and Trichoderma from alternative crop
systems to soybean monoculture could play an important role in tomato plant growth. This information could be
useful to decrease production costs and environmental impacts.
Jacqueline Giselle Commatteo, Verónica Fabiana Consolo, Pablo Andrés Barbieri, Fernanda Covacevich. (2019) Indigenous arbuscular mycorrhiza and Trichoderma from systems with soybean predominance can improve tomato growth, The Journal Soil & Environment , Volume 38, Issue 2.
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