Interactions between plant species and mycorrhizal colonization on the bacterial community composition in the rhizosphere |
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| Institution: | 1. Soil and Land Systems, School of Earth and Environmental Sciences, The University of Adelaide, Waite Campus, PMB#1, Glen Osmond SA 5064, Australia;2. Department of Applied Biology, University of Helsinki, P.O. Box 27,00014, Finland;1. Center for Integrative Conservation, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Menglun, Mengla, Yunnan, 666303, China;2. Center of Conservation Biology, Core Botanical Gardens, Chinese Academy of Sciences, Menglun, Mengla, Yunnan, 666303, China;1. School of Agriculture, Food and Wine, The University of Adelaide, South Australia 5005, Australia;2. Acid Sulfate Soils Centre, School of Biological Sciences, The University of Adelaide, South Australia 5064, Australia;1. AgroParisTech, Laboratoire des Symbioses Tropicales et Méditerranéennes, IRD/INRA/CIRAD/Montpellier SupAgro/Université Montpellier, TA10J, 34398 Montpellier Cedex 5, France;2. Ambatovy, Immeuble Tranofitaratra, 7ème étage, Rue Ravoninahitriniarivo, Ankorondrano, Antananarivo 101, Madagascar;3. Centre National de Recherches sur l’Environnement, Laboratoire de Microbiologie de l’environnement, Antananarivo, Madagascar;4. Institut de Systématique, Évolution, Biodiversité, ISYEB, UMR 7205, CNRS, MNHN, UPMC, EPHE, Muséum national d’Histoire naturelle, Sorbonne Universités, 57 rue Cuvier, CP50, 75005 Paris, France;5. CIRAD, Laboratoire des Symbioses Tropicales et Méditerranéennes, IRD/INRA/CIRAD/Montpellier SupAgro/Université Montpellier, TA10C, 34398 Montpellier Cedex 5, France;1. The Holden Arboretum, 9500 Sperry Road, Kirtland, OH 44094, USA;2. The Department of Biology, Case Western Reserve University, Cleveland, OH 44106, USA;3. Department of Biological Sciences, Kent State University, Kent, OH 44242, USA;1. Institute of Tropical Agriculture, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor Darul Ehsan, Malaysia;2. Department of Plant Protection, Faculty of Agriculture, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor Darul Ehsan, Malaysia;3. Department of Cell and Molecular Biology, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor Darul Ehsan, Malaysia;1. Laboratoire d’Ecologie Alpine, CNRS UMR 5553, Université Joseph Fourier, BP 53, 38041 Grenoble Cedex 09, France;2. Université de Caen Basse-Normandie, UMR950—INRA, Ecophysiologie Végétale Agronomie et Nutrition N, C, S, Esplanade de la Paix, 14032 CAEN Cedex, France;3. UMR Agroécologie INRA 1347/AgroSup/Université de Bourgogne, Pôle Interactions Plantes Microorganismes ERL CNRS 6300, 17 rue Sully, BP 86510, 21065 Dijon Cedex, France;4. Ecologie Microbienne, Université Lyon1, Université de Lyon, UMR CNRS 5557, USC INRA 1364, Villeurbanne Cedex, France |
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| Abstract: | This study assessed the effect of mycorrhizal colonization by Glomus intraradices (Gi) and G. versiforme (Gv) on the bacterial community composition in the rhizosphere of canola, clover and two tomato genotypes (wild type (76R) and its mutant with reduced mycorrhizal colonization (rmc)). Additionally, the effect of light intensity on the rhizosphere bacterial community composition of the tomato genotypes was studied. The bacterial community composition was assessed by denaturing gradient gel electrophoresis (DGGE). In canola, which is considered to be a non-mycorrhizal species, inoculation with Gi increased the shoot dw compared to Gv and the non-mycorrhizal control plants and also induced changes in the bacterial community composition in the rhizosphere. These fungal effects were observed although less than 8% of the root length of canola was colonized. On the other hand, about 50% of the root length of clover was colonized and inoculation with Gv resulted in a higher shoot dw compared to Gi or the control plants but the rhizosphere bacterial community composition was not affected by inoculation. Plant growth, mycorrhizal colonization and bacterial community composition of the two tomato genotypes were affected by a complex interaction between tomato genotype, AM fungal species and light intensity. Low light intensity (photosynthetic photon flux 200–250 μmol m−2 s−1) increased the shoot–root ratio in both genotypes and reduced colonization in the wild type. The differences in bacterial community composition between the two genotypes were more pronounced at low than at high light intensity (550–650 μmol m−2 s−1). |
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