Bacterial Diversity in Rhizospheres of Nontransgenic and Transgenic Corn

We examined two transgenic corn varieties, Bacillus thuringiensis-protected and Roundup Ready, which comprised 25% and 7% of the United States corn acreage, respectively, in 2000

Min Fang; Robert J. Kremer; Peter P. Motavalli; Georgia Davis

2005

Scholarcy highlights

  • Bacterial diversity in transgenic and nontransgenic corn rhizospheres was determined
  • Possible impacts on rhizosphere microbial communities are of concern because little is known of diversity-function relationships of microorganisms with transgenic plants in the soil environment
  • We examined two transgenic corn varieties, Bacillus thuringiensis-protected and Roundup Ready, which comprised 25% and 7% of the United States corn acreage, respectively, in 2000
  • Rhizospheres sampled at the 10-leaf growth stage differed in average well color development only for RR corn compared to non-RR corn in silty clay and in bulk silt loam
  • This study showed that rhizosphere bacterial diversity did not differ between transgenic or nontransgenic corn
  • We consistently observed no significant differences in optical density between rhizospheres of either nontransgenic or transgenic corn varieties under field conditions
  • Glufosinate-resistant corn was previously shown not to affect the bacterial community ; we found that RR corn had no effect on rhizosphere bacterial communities, and this is the first such report to our knowledge
  • Results are from only two transgenic corn varieties; more detailed studies on diversity of rhizosphere microorganisms are necessary to confirm these effects

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