NDLI: Burkholderia Species Are Major Inhabitants of White Lupin Cluster Roots ▿ †

Content Provider	PubMed Central
Author	Weisskopf, Laure Heller, Stefanie Eberl, Leo
Copyright Year	2011
Abstract	The formation of cluster roots by plants represents a highly efficient strategy for acquisition of sparingly available phosphate. This particular root type is characterized by a densely branched structure and high exudation of organic acids and protons, which are likely to influence the resident bacterial community. Until now, the identity of the bacterial populations living in cluster roots has not been investigated. We applied cultivation-dependent and cultivation-independent methods to characterize the dominant bacterial genera inhabiting the growing cluster roots of white lupin. We observed a high relative abundance of Burkholderia species (up to 58% of all isolated strains and 44% of all retrieved 16S rRNA sequences) and a significant enrichment with increasing cluster root age. Most of the sequences retrieved clustered together with known plant- or fungus-associated Burkholderia species, while only one of 98 sequences was affiliated with the Burkholderia cepacia complex. In vitro assays revealed that Burkholderia strains were much more tolerant to low pH than non-Burkholderia strains. Moreover, many strains produced large amounts of siderophores and were able to utilize citrate and oxalate as carbon sources. These features seem to represent important traits for the successful colonization and maintenance of Burkholderia species in white lupin cluster roots.
Related Links	http://dx.doi.org/10.1128/aem.05845-11
Ending Page	7720
Page Count	6
Starting Page	7715
File Format	PDF
ISSN	00992240
e-ISSN	10985336
Journal	Applied and Environmental Microbiology
Issue Number	21
Volume Number	77
Language	English
Publisher	American Society for Microbiology
Publisher Date	2011-11-01
Access Restriction	Open
Rights Holder	American Society for Microbiology
Subject Keyword	Biotechnology Food Science Ecology Applied Microbiology and Biotechnology Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Ecology Food Science Applied Microbiology and Biotechnology Biotechnology

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