Open AccessMinimal changes in rhizobacterial population structure following root colonization by wild type and transgenic biocontrol strains
Author(s) -
Bankhead Stacey Blouin,
Landa Blanca B.,
Lutton Elizabeth,
Weller David M.,
Gardener Brian B. McSpadden
Publication year - 2004
Publication title -
fems microbiology ecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.377
H-Index - 155
eISSN - 1574-6941
pISSN - 0168-6496
DOI - 10.1016/j.femsec.2004.04.005
Subject(s) - biology , colonization , biological pest control , population , population structure , microbiology and biotechnology , colonisation , transgene , botany , genetics , gene , demography , sociology
Pseudomonas fluorescens strains 2–79, Q8r1–96, and a recombinant strain, Z30–97, produce the antibiotics phenazine‐1‐carboxylic acid (PCA), 2,4‐diacetylphloroglucinol (DAPG), or both antibiotics, respectively. Rhizosphere colonization by these strains and subsequent alterations of bacterial community structure were assayed over multiple growth cycles of wheat under controlled conditions. While added to soil at just log 4 cells per gram prior to planting, all four strains subsequently colonized germinating wheat roots to levels in excess of log 6.5 cells per g (f.w.). Strain‐specific differences in rhizosphere competence were observed, but these were not generally related to the chromosomal insertion of the phz genes. Multiple differences in bacterial community structure were detected among treatments in each cycle; however, the large majority of changes were not consistently related to the abundance of inoculant strains in the rhizosphere nor the genetic make‐up of the inoculant strains. Nonetheless, T‐RFLP profiles of amplified 16S eubacterial sequences indicated that, when compared to the untreated samples, inoculation with Z30–97 resulted in several shifts in rhizosphere bacterial community structure previously associated with decreased levels of root disease.