Journal
MOLECULAR PLANT-MICROBE INTERACTIONS
Volume 31, Issue 2, Pages 212-223Publisher
AMER PHYTOPATHOLOGICAL SOC
DOI: 10.1094/MPMI-07-17-0185-R
Keywords
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Funding
- Academic Research Cluster 3 of Rhone-Alpes Region
- ANR project SymbioMaize [ANR-12-JSV7-0014-01]
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Fluorescent pseudomonads are playing key roles in plant-bacteria symbiotic interactions due to the multiple plant-beneficial functions (PBFs) they are harboring. The relative contributions of PBFs to plant-stimulatory effects of the well-known plant growth-promoting rhizobacteria Pseudomonas kilonensis F113 (formerly P. fluorescens F113) were investigated using a genetic approach. To this end, several deletion mutants were constructed, simple mutants Delta phlD (impaired in the biosynthesis of 2,4-diacetylphloroglucinol [DAPG]), Delta acdS (deficient in 1-aminocyclopropane-1-carboxylate deaminase activity), Delta gcd (glucose dehydrogenase deficient, impaired in phosphate solubilization), and Delta nirS (nitrite reductase deficient), and a quadruple mutant (deficient in the four PBFs mentioned above). Every PBF activity was quantified in the wild-type strain and the five deletion mutants. This approach revealed few functional interactions between PBFs in vitro. In particular, biosynthesis of glucose dehydrogenase severely reduced the production of DAPG. Contrariwise, the DAPG production impacted positively, but to a lesser extent, phosphate solubilization. Inoculation of the F113 wild-type strain on Arabidopsis thaliana Col-0 and maize seedlings modified the root architecture of both plants. Mutant strain inoculations revealed that the relative contribution of each PBF differed according to the measured plant traits and that F113 plant-stimulatory effects did not correspond to the sum of each PBF relative contribution. Indeed, two PBF genes (Delta acdS and Delta nirS) had a significant impact on root-system architecture from both model plants, in in vitro and in vivo conditions. The current work underscored that few F113 PBFs seem to interact between each other in the free-living bacterial cells, whereas they control in concert Arabidopsis thaliana and maize growth and development.
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