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Impact of inoculation with Azospirillum spp. on growth properties and seed yield of wheat: a meta-analysis of studies in the ISI Web of Science from 1981 to 2008

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Abstract

Azospirillum spp. represents one of the most studied plant growth promoting bacteria. A meta-analysis was conducted on 59 available articles to evaluate the extent to which Azospirillum may contribute to wheat growth properties. A mean increase of 8.9% in seed yield and 17.8% in aboveground dry weight was found to result from inoculation of wheat with Azospirillum. However, key determinants for the plant growth promoting effect were found to be the amount of N fertilization applied–maximum plant growth promoting effect was reported in the absence of N fertilization- and identities of wheat cultivar—Triticum aestivum was superior to Triticum durum-and Azospirillum isolate—Azospirillum lipoferum was more effective than Azospirillum brasilense. Co-inoculation with Azotobacter tended to further increase the growth promoting effect of Azospirillum on seed yield. A weak relationship between plant growth promoting effect on seed yield and aboveground biomass was detected. Inoculation with Azospirillum decreased the shoot:root ratio of wheat in field trials; but for pot trials, a key determinant of the shoot:root effect was the size of the pot used. The authors, thus, raise the scepticism of whether the growth parameters recorded in pot trials are representative of those under field conditions. Results highlight the efficiency of Azospirillum as an inoculant of wheat.

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Acknowledgements

The authors would like to thank professor D. S. Veresoglou for assistance in collecting the articles and comments to earlier versions of the manuscript. The authors are grateful to two anonymous reviewers for their extremely helpful comments throughout the submission process of the manuscript.

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  1. Department of Environmental and Geographical Sciences, Manchester Metropolitan University, John Dalton Building, Chester Street, M15GD, Manchester, UK

    Stavros D. Veresoglou

  2. Laboratory of Agronomy, School of Agriculture, Aristotle University of Thessaloniki, Thessaloniki, Greece

    George Menexes

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  1. Stavros D. Veresoglou
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Appendix

Appendix

Analytical information on statistics that were incorporated in the analyses of variance that are presented in the article.

Table 2 Random-effects one-way ANOVA for the impact of wheat cultivar and A. brasilense isolate identities on the effect sizes of seed yield
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Table 3 Random-effects one-way ANOVA for the impact of wheat cultivar and different Asospirillum species identities on the effect sizes of seed yield
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Table 4 Direct comparison of the impact of the two common wheat cultivars on the effect sizes of seed yield
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Table 5 Direct comparison of the impact of the two common Azospirillum species on the effect sizes of seed yield
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Veresoglou, S.D., Menexes, G. Impact of inoculation with Azospirillum spp. on growth properties and seed yield of wheat: a meta-analysis of studies in the ISI Web of Science from 1981 to 2008. Plant Soil 337, 469–480 (2010). https://doi.org/10.1007/s11104-010-0543-7

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