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Symbiosis

, Volume 47, Issue 1, pp 23–33 | Cite as

Diazotrophic endophytes of native black cottonwood and willow

  • Sharon L. Doty
  • Brian Oakley
  • Gang Xin
  • Jun Won Kang
  • Glenda Singleton
  • Zareen Khan
  • Azra Vajzovic
  • James T. Staley
Article

Abstract

Poplar and willow are economically-important, fast-growing tree species with the ability to colonize nutrient-poor environments. To initiate a study on the possible contribution of endophytes to this ability, we isolated bacteria from within surface-sterilized stems of native poplar (Populus trichocarpa) and willow (Salix sitchensis) in a riparian system in western Washington state. Several of the isolates grew well in nitrogen-limited medium. The presence ofnifH, a gene encoding one of the subunits of nitrogenase, was confirmed in several of the isolates including species ofBurkholderia, Rahnella, Sphingomonas, andAcinetobacter. Nitrogenase activity (as measured by the acetylene reduction assay) was also confirmed in some of the isolates. The presence of these diazotrophic microorganisms may help explain the ability of these pioneering tree species to grow under nitrogen limitation.

Keywords

Endophyte nitrogen fixation poplar willow Salicaceae 

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Copyright information

© Springer 2009

Authors and Affiliations

  • Sharon L. Doty
    • 1
  • Brian Oakley
    • 2
  • Gang Xin
    • 3
  • Jun Won Kang
    • 1
  • Glenda Singleton
    • 1
  • Zareen Khan
    • 1
  • Azra Vajzovic
    • 1
  • James T. Staley
    • 2
  1. 1.College of Forest ResourcesUniversity of WashingtonSeattleUSA
  2. 2.Department of MicrobiologyUniversity of WashingtonSeattleUSA
  3. 3.Department of Civil and Environmental EngineeringUniversity of WashingtonSeattleUSA

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