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Applied and Environmental Microbiology, August 1999, p. 3398-3400, Vol. 65, No. 8
0099-2240/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Culture-Independent Identification of Microorganisms That Respond to Specified Stimuli

James Borneman*

Department of Plant Pathology, University of California, Riverside, California 92521

Received 5 February 1999/Accepted 17 May 1999

A new approach that permits culture-independent identification of microorganisms that respond to specified stimuli was developed. This approach was illustrated by examination of microorganisms that grew in response to various nutrient supplements added to soil. A thymidine nucleotide analog, bromodeoxyuridine (BrdU), and supplements were added to soil and incubated for 3 days. DNA was extracted from the soil, and the newly synthesized DNA was isolated by immunocapture of the BrdU-labeled DNA. The unique perspective this approach offers was demonstrated by comparing the microbial community structures obtained from total soil DNA and the BrdU-labeled fraction in an rRNA gene (rDNA) analysis. The traditional total DNA analysis revealed no notable differences between the treatments, whereas the BrdU-labeled DNA showed significantly different banding patterns between the nutrient supplement treatments and compared with total DNA banding patterns. PCR primers were developed to specifically amplify the intergenic region of an rDNA sequence unique to the BrdU analysis of a phosphate supplement treatment. Amplification of DNA from all treatments using these primers showed that it was unique to the phosphate treatment and that it was present in both the total DNA and BrdU-labeled DNA fractions. This result demonstrates the promise of this new strategy, because it was able to permit identification of a sequence from a phosphate-responsive organism that was not discernable in the traditional total DNA community structure analysis.

* Mailing address: Department of Plant Pathology, University of California, Riverside, CA 92521. Phone: 909-787-3584. Fax: 909-787-3782. E-mail: borneman{at}ucrac1.ucr.edu.

Applied and Environmental Microbiology, August 1999, p. 3398-3400, Vol. 65, No. 8
0099-2240/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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