Importance of rare taxa for bacterial diversity in the rhizosphere of Bt- and conventional maize varieties

Dohrmann AB, Küting M, Jünemann S, Jaenicke S, Schlüter A, Tebbe CC (2012)
The ISME journal 7(1): 37-49.

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Abstract
Ribosomal 16S rRNA gene pyrosequencing was used to explore whether the genetically modified (GM) Bt-maize hybrid MON 89034 × MON 88017, expressing three insecticidal recombinant Cry proteins of Bacillus thuringiensis, would alter the rhizosphere bacterial community. Fine roots of field cultivated Bt-maize and three conventional maize varieties were analyzed together with coarse roots of the Bt-maize. A total of 547 000 sequences were obtained. Library coverage was 100% at the phylum and 99.8% at the genus rank. Although cluster analyses based on relative abundances indicated no differences at higher taxonomic ranks, genera abundances pointed to variety specific differences. Genera-based clustering depended solely on the 49 most dominant genera while the remaining 461 rare genera followed a different selection. A total of 91 genera responded significantly to the different root environments. As a benefit of pyrosequencing, 79 responsive genera were identified that might have been overlooked with conventional cloning sequencing approaches owing to their rareness. There was no indication of bacterial alterations in the rhizosphere of the Bt-maize beyond differences found between conventional varieties. B. thuringiensis-like phylotypes were present at low abundance (0.1% of Bacteria) suggesting possible occurrence of natural Cry proteins in the rhizospheres. Although some genera indicated potential phytopathogenic bacteria in the rhizosphere, their abundances were not significantly different between conventional varieties and Bt-maize. With an unprecedented sensitivity this study indicates that the rhizosphere bacterial community of a GM maize did not respond abnormally to the presence of three insecticidal proteins in the root tissue.The ISME Journal advance online publication, 12 July 2012; doi:10.1038/ismej.2012.77.
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Dohrmann AB, Küting M, Jünemann S, Jaenicke S, Schlüter A, Tebbe CC. Importance of rare taxa for bacterial diversity in the rhizosphere of Bt- and conventional maize varieties. The ISME journal. 2012;7(1):37-49.
Dohrmann, A. B., Küting, M., Jünemann, S., Jaenicke, S., Schlüter, A., & Tebbe, C. C. (2012). Importance of rare taxa for bacterial diversity in the rhizosphere of Bt- and conventional maize varieties. The ISME journal, 7(1), 37-49.
Dohrmann, A. B., Küting, M., Jünemann, S., Jaenicke, S., Schlüter, A., and Tebbe, C. C. (2012). Importance of rare taxa for bacterial diversity in the rhizosphere of Bt- and conventional maize varieties. The ISME journal 7, 37-49.
Dohrmann, A.B., et al., 2012. Importance of rare taxa for bacterial diversity in the rhizosphere of Bt- and conventional maize varieties. The ISME journal, 7(1), p 37-49.
A.B. Dohrmann, et al., “Importance of rare taxa for bacterial diversity in the rhizosphere of Bt- and conventional maize varieties”, The ISME journal, vol. 7, 2012, pp. 37-49.
Dohrmann, A.B., Küting, M., Jünemann, S., Jaenicke, S., Schlüter, A., Tebbe, C.C.: Importance of rare taxa for bacterial diversity in the rhizosphere of Bt- and conventional maize varieties. The ISME journal. 7, 37-49 (2012).
Dohrmann, Anja B, Küting, Meike, Jünemann, Sebastian, Jaenicke, Sebastian, Schlüter, Andreas, and Tebbe, Christoph C. “Importance of rare taxa for bacterial diversity in the rhizosphere of Bt- and conventional maize varieties”. The ISME journal 7.1 (2012): 37-49.
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