Adaptational changes in cellular fatty acid branching and unsaturation of Aeromonas species as a response to growth temperature and salinity.
The effects of growth temperature and salinity on the cellular fatty acids were investigated on Aeromonas caviae, Aeromonas hydrophila and Aeromonas sobria. Under optimal growth conditions, fatty acids patterns were dominated by even-numbered chains C(16:0), C(16:1cis9), C(18:1cis11), C(12:0) and C(14:0). Growth temperature modifications induced, in the three Aeromonas species, important changes in fatty acid (i) unsaturation, (ii) branching and (iii) chain length. An important decrease in the C(18:1cis11) fatty acid content was observed for the three species below 15 degrees C and above 25 degrees C. The evolution of C(18:1cis11) and C(16:0) showed a mirror image for the three Aeromonas species. Low NaCl concentrations did not elicit significant changes in the fatty acids content of the three Aeromonas species. However, for high NaCl concentration in the medium, the growth ability was related to an important decrease of the unsaturated to saturated fatty acids ratio indicating a membrane rigidification. Thermal and salinity adaptations were branched fatty acid-dependent for A. caviae, whereas this phenomenon was less significant for A. hydrophila and A. sobria.
Chihib
Nour Eddine
NE
Université des Sciences et Technologies de Lille, Laboratoire de Microbiologie, Bâtiment SN2, Cité Scientifique, F-59655 Villeneuve d'Ascq Cedex, France. Nour-Eddine.Chihib@univ-lille1.fr
Tierny
Yann
Y
Mary
Patrice
P
Hornez
Jean Pierre
JP
D000222:Adaptation, Physiological; D000333:Aeromonas / Q000254:growth & development / Q000378:metabolism / Q000502:physiology*; D005227:Fatty Acids / Q000737:chemistry / Q000378:metabolism*; D005231:Fatty Acids, Unsaturated / Q000737:chemistry / Q000378:metabolism; D006863:Hydrogen-Ion Concentration; D007536:Isomerism; D012965:Sodium Chloride / Q000378:metabolism* / Q000494:pharmacology; D013696:Temperature
D005227:Fatty Acids; D005231:Fatty Acids, Unsaturated; D012965:Sodium Chloride