
The presence of a 1‐aminocyclopropane‐1‐carboxylate (ACC) deaminase deletion mutation alters the physiology of the endophytic plant growth‐promoting bacterium Burkholderia phytofirmans PsJN
Author(s) -
Sun Yili,
Cheng Zhenyu,
Glick Bernard R.
Publication year - 2009
Publication title -
fems microbiology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.899
H-Index - 151
eISSN - 1574-6968
pISSN - 0378-1097
DOI - 10.1111/j.1574-6968.2009.01625.x
Subject(s) - biology , rpos , mutant , siderophore , microbiology and biotechnology , burkholderia , bacteria , biochemistry , gene , gene expression , genetics , promoter
The structural gene for 1‐aminocyclopropane‐1‐carboxylate (ACC) deaminase ( acdS ) from the endophytic plant growth‐promoting bacterium Burkholderia phytofirmans PsJN was isolated and used to construct a mutant strain B. phytofirmans YS2 ( B. phytofirmans PsJN/Δ acdS ), in which an internal segment of the acdS gene was deleted. The mutant YS2 lost ACC deaminase activity as well as the ability to promote the elongation of the roots of canola seedlings. Concomitant with the creation of this deletion mutant, a number of physiological changes were observed in the bacterium, including an increase in indole acetic acid synthesis, a decrease in the production of siderophores and an increase in the cellular level of the stationary‐phase σ factor, RpoS. Introduction of the wild‐type acdS gene into the mutant YS2 to construct strain B. phytofirmans YS3 ( B. phytofirmans YS2/pRK‐AcdS) restored both ACC deaminase activity and plant growth‐promotion activity in strain YS3. However, the complemented mutant still showed the above‐mentioned physiological changes.