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Differential effects of Paenibacillus spp. on cucumber mycorrhizas

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Abstract

The effects of 17 Paenibacillus strains on root colonization by Glomus intraradices or Glomus mosseae and plant growth parameters (shoot and root weight) of mycorrhizal cucumber plants were examined. The Paenibacillus strains were originally isolated from mycorrhizal (G. intraradices) and non-mycorrhizal cucumber rhizosphere and/or hyphosphere, except for strain EJP73, which originated from a Pinus sylvestris-Lactarius rufus ectomycorrhiza. Root colonization of cucumber plants by G. intraradices or G. mosseae was unaffected by all seven strains of Paenibacillus polymyxa, but was decreased or increased by four strains of Paenibacillus macerans and strain EJP73 of Paenibacillus sp. Overall, shoot dry weight of cucumber grown in symbioses with either G intraradices or G. mosseae was unaffected by inoculation with all of the Paenibacillus strains, except for strain MB02-429 of P. macerans, which increased the shoot dry weight in the cucumber-G. mosseae symbiosis. On the other hand, several Paenibacillus strains caused altered root growth. Three strains of P. polymyxa and four strains of P. macerans increased the root fresh weight of the cucumber–G. intraradices symbiosis, whereas three strains of P. polymyxa and one strain of P. macerans as well as Paenibacillus sp. EJP73, decreased the root fresh weight of the cucumber–G. mosseae symbiosis. In conclusion, our results show that bacteria from several species of Paenibacillus differentially affect cucumber mycorrhizas.

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Acknowledgements

The work was supported by the Sino–Danish Scientific and Technological Cooperation New Project Proposal for 14th Session (2004–2006; Granted No. AM14: 33). Tina Tønnersen is thanked for excellent technical assistance. Dr. Gary D. Bending is thanked for providing us with Paenibacillus sp. EJP73.

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Authors and Affiliations

  1. Institute of Biotechnology, Zhejiang University, Hangzhou, 310029, China

    Bin Li & Guanlin Xie

  2. Department of Integrated Pest Management, Faculty of Agricultural Science, University of Aarhus, DK-4200, Slagelse, Denmark

    Bin Li, Sabine Ravnskov & John Larsen

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  1. Bin Li
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Correspondence to Bin Li.

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Li, B., Ravnskov, S., Xie, G. et al. Differential effects of Paenibacillus spp. on cucumber mycorrhizas. Mycol Progress 7, 277–284 (2008). https://doi.org/10.1007/s11557-008-0570-4

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  • DOI: https://doi.org/10.1007/s11557-008-0570-4

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