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Application of Mycorrhiza and Soil from a Permaculture System Improved Phosphorus Acquisition in Naranjilla

Symanczik, Sarah; Gisler, Michelle; Thonar, Cécile; Schlaeppi, Klaus; van der Heijden, Marcel; Kahmen, Ansgar; Boller, Thomas and Mäder, Paul (2017) Application of Mycorrhiza and Soil from a Permaculture System Improved Phosphorus Acquisition in Naranjilla. Frontiers in Plant Science, 8:1263, pp. 1-12.

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Online at: https://www.frontiersin.org/articles/10.3389/fpls.2017.01263/full

Summary

Naranjilla (Solanum quitoense) is a perennial shrub plant mainly cultivated in Ecuador, Colombia, and Central America where it represents an important cash crop. Current cultivation practices not only cause deforestation and large-scale soil degradation but also make plants highly susceptible to pests and diseases. The use of arbuscular mycorrhizal fungi (AMF) can offer a possibility to overcome these problems. AMF can act beneficially in various ways, for example by improving plant nutrition and growth, water relations, soil structure and stability and protection against biotic and abiotic stresses. In this study, the impact of AMF inoculation on growth and nutrition parameters of naranjilla has been assessed. For inoculation three European reference AMF strains (Rhizoglomus irregulare, Claroideoglomus claroideum, and Cetraspora helvetica) and soils originating from three differently managed naranjilla plantations in Ecuador (conventional, organic, and permaculture) have been used. This allowed for a comparison of the performance of exotic AMF strains (reference strains) versus native consortia contained in the three soils used as inocula. To study fungal communities present in the three soils, trap cultures have been established using naranjilla as host plant. The community structures of AMF and other fungi inhabiting the roots of trap cultured naranjilla were assessed using next generation sequencing (NGS) methods. The growth response experiment has shown that two of the three reference AMF strains, a mixture of the three and soil from a permaculture site led to significantly better acquisition of phosphorus (up to 104%) compared to uninoculated controls. These results suggest that the use of AMF strains and local soils as inoculants represent a valid approach to improve nutrient uptake efficiency of naranjilla and consequently to reduce inputs of mineral fertilizers in the cultivation process. Improved phosphorus acquisition after inoculation with permaculture soil might have been caused by a higher abundance of AMF and the presence of Piriformospora indica as revealed by NGS. A higher frequency of AMF and enhanced root colonization rates in the trap cultures supplemented with permaculture soil highlight the importance of diverse agricultural systems for soil quality and crop production.


EPrint Type:Journal paper
Keywords:naranjilla, arbuscular mycorrhizal fungi, fungal communities, Piriformospora indica, farming practices, permaculture, next generation sequencing, Department of Soil Sciences, Plant Symbiosis, Long-term Experiments
Subjects: Soil
Crop husbandry > Crop health, quality, protection
Research affiliation: Switzerland > FiBL - Research Institute of Organic Agriculture Switzerland > Soil Sciences
Switzerland > Agroscope
Switzerland > Other organizations
ISSN:1664-462X
DOI:10.3389/fpls.2017.01263
Deposited By: Forschungsinstitut für biologischen Landbau, FiBL
ID Code:33353
Deposited On:18 Jun 2018 13:13
Last Modified:18 Jun 2018 13:13
Document Language:English
Status:Published
Refereed:Peer-reviewed and accepted

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