Philippe Constant

Associate Professor,
INRS-Institut Armand-Frappier

531, boulevard des Prairies, Laval, Quebec H7V 1B7
Tel: 450 687-5010
E-mail: philippe.constant@iaf.inrs.ca
Institution page
Personal page



Education
  • Postdoc. Biogeochemistry, Biogeochemistry and Microbiology, Max Planck Institute for Terrestrial Microbiology, 2008
  • Doctorate, Biology, Environmental Microbiology, INRS-Institute Armand Frappier, 2004
  • Bachelor's, Biological Sciences, Microbiology and immunology, Université de Montréal


Research
Our research group is interested in the biogeochemical cycle of the trace gases that are either directly or indirectly constraining the Earth’s energy balance. The objective of our research includes the identification of the microorganisms controlling atmospheric trace gas budgets and the analysis of the impact of global change on microbial biogeochemistry. Microorganisms demonstrating the ability to oxidize atmospheric trace gases have evolved unusual metabolic pathways involving enzymes displaying high substrate affinity. In some bacteria, the scavenging of atmospheric trace gases provides an alternative energy source supplying maintenance energy requirements or secondary metabolites synthesis. An assessment of the potential biotechnological applications of these microorganisms is also part of the research agenda of our team. The research is organized to shed light on these questions of fundamental interest:
  • Which microorganisms oxidize atmospheric trace gases? What are the environmental factors influencing their distribution and their activity?
  • Will the microorganisms maintain their role in mitigating anthropogenic trace gas emissions?
  • Are there environmental management strategies to preserve or stimulate the biogeochemical functions?
  • Is the exploitation of microorganisms consuming trace gases an efficient approach to increase the production yield of secondary metabolites, biodegradation and other bioprocesses?


Publications
29- Denitrifying metabolism of the methylotrophic marine bacterium Methylophaga nitratireducenticrescens strain JAM1
Mauffrey F., Cucaita A., Constant P., Villemur R.
2017 PeerJ (Date Added: 2017-12-13)

28- Survey of High-Affinity H2-Oxidizing Bacteria in Soil Reveals Their Vast Diversity Yet Underrepresentation in Genomic Databases
Piché-Choquette S., Khdhiri M., Constant P.
2017 Microbial Ecology (Date Added: 2017-06-28)

27- The tale of a neglected energy source: Elevated hydrogen exposure affects both microbial diversity and function in soil
Khdhiri M., Piché-Choquette S., Tremblay J., Tringe S.G., Constant P.
2017 Applied and Environmental Microbiology (Date Added: 2017-06-12)

26- Detection and isolation of plant-associated bacteria scavenging atmospheric molecular hydrogen
Kanno, M., Constant, P., Tamaki, H., Kamagata, Y.
2016 Environmental Microbiology (Date Added: 2017-03-27)

25- H2-saturation of high affinity H2-oxidizing bacteria alters the ecological niche of soil microorganisms unevenly among taxonomic groups
Piché-Choquette, S., Tremblay, J., Tringe, S.G., Constant, P.
2016 PeerJ (Date Added: 2017-03-27)

24- Towards the development of multifunctional molecular indicators combining soil biogeochemical and microbiological variables to predict the ecological integrity of silvicultural practices
Peck, V., Quiza, L., Buffet, J.-P., Khdhiri, M., Durand, A.-A., Paquette, A., Thiffault, N., Messier, C., Beaulieu, N., Guertin, C., Constant, P.
2016 Microbial Biotechnology (Date Added: 2017-03-27)

21- Surveying the endomicrobiome and ectomicrobiome of bark beetles: The case of Dendroctonus simplex
Durand, A.-A., Bergeron, A., Constant, P., Buffet, J.-P., Déziel, E., Guertin, C.
2015 Scientific Reports (Date Added: 2017-03-29)

20- Soil carbon content and relative abundance of high affinity H2-oxidizing bacteria predict atmospheric H2 soil uptake activity better than soil microbial community composition
Khdhiri, M., Hesse, L., Popa, M.E., Quiza, L., Lalonde, I., Meredith, L.K., Röckmann, T., Constant, P.
2015 Soil Biology and Biochemistry (Date Added: 2017-03-29)

19- Atmospheric hydrogen scavenging: From enzymes to ecosystems
Greening, C., Constant, P., Hards, K., Morales, S.E., Oakeshott, J.G., Russell, R.J., Taylor, M.C., Berney, M., Conrad, R., Cookb, G.M.
2015 Applied and Environmental Microbiology (Date Added: 2017-03-29)

18- Land-use influences the distribution and activity of high affinity CO-oxidizing bacteria associated to type I-coxL genotype in soil
Quiza, L., Lalonde, I., Guertin, C., Constant, P.
2014 Frontiers in Microbiology (Date Added: 2017-03-29)

17- Toxicity survey of Canadian Arctic marine sediments
Canário, J., Poissant, L., Pilote, M., Blaise, C., Constant, P., Férard, J.-F., Gagné, F.
2014 Journal of Soils and Sediments (Date Added: 2017-03-29)

16- Hydrogenase
Constant, P., Hallenbeck, P.C.
2013 Biohydrogen (Date Added: 2017-03-29)

15- The fate of mercury in Arctic terrestrial and aquatic ecosystems, a review
Douglas, T.A., Loseto, L.L., MacDonald, R.W., Outridge, P., Dommergue, A., Poulain, A., Amyot, M., Barkay, T., Berg, T., Chetelat, J., Constant, P., Evans, M., Ferrari, C., Gantner, N., Johnson, M.S., Kirk, J., Kroer, N., Larose, C., Lean, D., Nielsen, T.G., Poissant, L., Rognerud, S., Skov, H., Sørensen, S., Wang, F., Wilson, S., Zdanowicz, C.M.
2012 Environmental Chemistry (Date Added: 2017-03-29)

14- Co-localization of atmospheric H2 oxidation activity and high affinity H2-oxidizing bacteria in non-axenic soil and sterile soil amended with Streptomyces sp. PCB7
Constant, P., Chowdhury, S.P., Hesse, L., Conrad, R.
2011 Soil Biology and Biochemistry (Date Added: 2017-03-29)

13- Genome data mining and soil survey for the novel group 5 [NiFe]-hydrogenase to explore the diversity and ecological importance of presumptive high-affinity H 2-oxidizing bacteria
Constant, P., Chowdhury, S.P., Hesse, L., Pratscher, J., Conrad, R.
2011 Applied and Environmental Microbiology (Date Added: 2017-03-29)

12- Streptomycetes contributing to atmospheric molecular hydrogen soil uptake are widespread and encode a putative high-affinity [NiFe]-hydrogenase
Constant, P., Chowdhury, S.P., Pratscher, J., Conrad, R.
2010 Environmental Microbiology (Date Added: 2017-03-29)

11- Tropospheric H2 budget and the response of its soil uptake under the changing environment
Constant, P., Poissant, L., Villemur, R.
2009 Science of the Total Environment (Date Added: 2017-03-29)

10- Isolation of Streptomyces sp. PCB7, the first microorganism demonstrating high-affinity uptake of tropospheric H2
Constant, P., Poissant, L., Villemur, R.
2008 ISME Journal (Date Added: 2017-03-29)

9- Critical review of mercury fates and contamination in the arctic tundra ecosystem
Poissant, L., Zhang, H.H., Canário, J., Constant, P.
2008 Science of the Total Environment (Date Added: 2017-03-29)

8- Annual hydrogen, carbon monoxide and carbon dioxide concentrations and surface to air exchanges in a rural area (Québec, Canada)
Constant, P., Poissant, L., Villemur, R.
2008 Atmospheric Environment (Date Added: 2017-03-29)

7- The ebullition of hydrogen, carbon monoxide, methane, carbon dioxide and total gaseous mercury from the Cornwall Area of Concern
Poissant, L., Constant, P., Pilote, M., Canário, J., O'Driscoll, N., Ridal, J., Lean, D.
2007 Science of the Total Environment (Date Added: 2017-03-29)

6- Fate of inorganic mercury and methyl mercury within the snow cover in the low arctic tundra on the shore of Hudson Bay (Québec, Canada)
Constant, P., Poissant, L., Villemur, R., Yumvihoze, E., Lean, D.
2007 Journal of Geophysical Research Atmospheres (Date Added: 2017-03-29)

5- Heterogeneity between 16S ribosomal RNA gene copies borne by one Desulfitobacterium strain is caused by different 100-200 bp insertions in the 5′ region
Villemur, R., Constant, P., Gauthier, A., Shareck, M., Beaudet, R.
2007 Canadian Journal of Microbiology (Date Added: 2017-03-29)

4- Abiotic source of reactive organic halogens in the sub-arctic atmosphere?
Carpenter, L.J., Hopkins, J.R., Jones, C.E., Lewis, A.C., Parthipan, R., Wevill, D.J., Poissant, L., Pilote, M., Constant, P.
2005 Environmental Science and Technology (Date Added: 2017-03-29)

2- A year of continuous measurements of three atmospheric mercury species (GEM, RGM and Hgp) in southern Québec, Canada
Poissant, L., Pilote, M., Beauvais, C., Constant, P., Zhang, H.H.
2005 Atmospheric Environment (Date Added: 2017-03-29)

1- Mercury gas exchanges over selected bare soil and flooded sites in the bay St. François wetlands (Québec, Canada)
Poissant, L., Pilote, M., Constant, P., Beauvais, C., Zhang, H.H., Xu, X.
2004 Atmospheric Environment (Date Added: 2017-03-29)