Plant Cell, Tissue and Organ Culture

, Volume 85, Issue 3, pp 353–359

Identification of IAA-producing endophytic bacteria from micropropagated Echinacea plants using 16S rRNA sequencing

  • H. Lata
  • X.C. Li
  • B. Silva
  • R.M. Moraes
  • L. Halda-Alija


The presence of latent bacteria is a serious problem in plant tissue cultures. While endophytes are generally beneficial to plants in situ, they may affect culture growth under the modified conditions in vitro. The present study was undertaken to identify and characterize endophytic bacteria associated with the medicinal plant Echinacea in tissue culture. Based on classical microbiological tests and 16S rRNA analyses, it was found that endophytic bacteria associated with aseptically micropropagated Echinacea plantlets are representatives of several genera, Acinetobacter, Bacillus, Pseudomonas, Wautersia (Ralstonia) and Stenotrophomonas. Based on TLC and HPLC analyses, we found that Pseudomonas stutzeri P3 strain produces plant hormone, auxin (indole-3-acetic acid, IAA). Antibiotic resistance was also assessed as a virulence factor. The majority of endophytic bacteria were resistant to the antibiotic kanamycin, but susceptible to chloramphenicol. Recommendations for propagating Echinaceain vitro cultures involve the addition of chloramphenicol, tetracycline, and ampicillin, antibiotics that cause no side effects on these plant species.


antibiotic resistance auxin Echinacea endophytes medicinal plants molecular markers 



indole-3-acetic acid


Murashige and Skoog medium


nutrient agar


nutrient broth


tryptic soy agar


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Copyright information

© Springer Science+Business Media, Inc. 2006

Authors and Affiliations

  • H. Lata
    • 1
  • X.C. Li
    • 1
  • B. Silva
    • 1
  • R.M. Moraes
    • 1
  • L. Halda-Alija
    • 1
    • 2
  1. 1.National Center for Natural Products Research, Research Institute of Pharmaceutical Sciences, School of PharmacyThe University of Mississippi UniversityUSA
  2. 2.Department of BiologyThe University of MississippiUniversityUSA

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