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Title of Journal: World J Microbiol Biotechnol

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Abbravation: World Journal of Microbiology and Biotechnology

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Springer Netherlands

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DOI

10.1016/0029-554x(80)90538-8

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1573-0972

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Rootpromoting rhizobacteria in Emphasis Type="It

Authors: Katy Díaz Carolina Valiente Miguel Martínez Miguel Castillo Eugenio Sanfuentes
Publish Date: 2009/01/29
Volume: 25, Issue: 5, Pages: 867-
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Abstract

Cloned Eucalyptus spp plantations are based in greenhouse production of plants generated by vegetative propagation Diverse studies have demonstrated that rhizospheric bacteria can stimulate plant growth and more recently that they can increase rooting in vegetative material Considering this potential the objective of this study was to verify the effect of bacterial strains on rooting Eucalyptus globulus A total of 132 bacterial strains isolated from the rhizosphere of E globulus and Eucalyptus nitens were studied The bacterial inoculums in a concentration of 4 × 108 cfu/ml were applied to the rooting substrate at the cutting installation and 45 days after by irrigation Rooting was evaluated on days 60 and 75 after cutting installation considering the number of roots as well as their fibrosity and roots biomass Of the 132 strains evaluated 26 significantly increased cutting rooting in a range of 1914–694 with respect to the control Additionally some strains stimulated the development of fine roots and incremented the roots biomass The strains identificated that produced a rooting effect were Bacillus firmus Bacillus mycoides Bacillus stearothermophilus Bacillus subtilis B subtilis/amyloliquefaciens Bacillus circulans Brevibacillus brevis Paenibacillus lautus and Stenotrophomona maltophilia These first trials suggest the potential of these bacteria to be used in clonal production programs for E globulusThis research was financed by Forestal Mininco SA The authors are grateful to Dr Alioune Ngom University of Windsor Ontario Canada for his suggestions on the translation manuscript The authors would like to thank Carlos Villagra Carlos Douglas Nursery CMPC Forestal for their collaboration in this study

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