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Cumulative effects of tree-based intercropping on arbuscular mycorrhizal fungi

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Abstract

In tree-based intercropping system (agroforestry), the role of perennial trees in maintaining active populations and mycelial networks of arbuscular mycorrhizal fungi (AMF) is well documented. Agroforestry positively influences the AMF community, but complete studies regarding mycorrhization in such systems are scarce. The present study was conducted to assess the effect of tree introduction in agriculture fields on mycorrhization. In particular, we investigated the effect of trees on AMF colonization of intercrops and vice versa, the effect of canopy management of trees on their root colonization, and the cross-infectivity of AMF isolated from tree rhizosphere in intercrops and vice versa. The results of the field study suggest that in agroforestry systems, trees acted as AMF inoculum reservoir for intercrops, especially during the rainy season. Intercropping (Phaseolus mungo and Triticum aestivum in the rainy and winter seasons, respectively) increased mycorrhization, i.e., root colonization and spore population in the rhizosphere of Albizia procera and Eucalyptus tereticornis. Canopy management, i.e., shoot pruning, reduces root colonization in A. procera, Anogeissus pendula, Dalbergia sissoo, Hardwickia binata, and Tectona grandis, especially in April 2005 (late spring), but during subsequent periods, differences among the treatments were at par. Results from greenhouse suggest that AMF are nonspecific in their selection of host since species isolated from tree rhizosphere could colonize the roots of crops and vice versa.

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Acknowledgments

The authors are very thankful to the Director, NRCAF, Jhansi, India, for facilitating the research program and constant encouragement during the study period. Thanks are also due to anonymous reviewers for critical comments and suggestions. Ashok Shukla acknowledges funding through University Grants Commission’s Dr. DS Kothari Post Doctoral Fellowship Scheme, New Delhi, India, during the preparation of this paper.

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Shukla, A., Kumar, A., Jha, A. et al. Cumulative effects of tree-based intercropping on arbuscular mycorrhizal fungi. Biol Fertil Soils 48, 899–909 (2012). https://doi.org/10.1007/s00374-012-0682-5

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  • DOI: https://doi.org/10.1007/s00374-012-0682-5

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