Naphthenic acids inhibit root water transport, gas exchange and leaf growth in aspen (Populus tremuloides) seedlings

Abstract

Effects of sodium naphthenates (NAs) on root hydraulic conductivity (Lp) and gas exchange processes were examined in aspen (Populus tremuloides Michx.) seedlings grown in solution culture. Exposure of roots to NAs for 3-5 weeks significantly decreased Lp and stomatal conductance. Root-absorbed NAs also decreased leaf chlorophyll concentration, net photosynthesis and leaf growth. Short-term (< or = 2 h) exposure of excised roots to NAs significantly decreased root water flow (Qv) with a concomitant decline in root respiration. We conclude that NAs metabolically inhibited Lp, likely by affecting water channel activity, and that this inhibition could be responsible for the observed reductions in gas exchange and leaf growth.

Foliar and root treatments of cucumber with potassium naphthenate: Antioxidative responses

“…The concentrations of K-naph used in this study (0.1, 1 and 10 μM), were by 10 and 100 times higher compared to the concentration used in our previous studies [18,20,21,26], but were much lower than the concentrations used in phytotoxicity studies [27,28].…”

Shifts in Root-Associated Microbial Communities ofTypha LatifoliaGrowing in Naphthenic Acids and Relationship to Plant Health

“…The Fluka mixture NAs have a lower mass range of components (157-297 m/z) than the oil sands NAs (195-325 m/z) (Armstrong et al, 2008) and differences in the molecular weight of the two NA groups may have played a role in determining phytotoxicity, possibly by impacting water transport (Kamaluddin and Zwiazek, 2002). Specific changes to the microbial communities may also have influenced the increased phytotoxicity seen in Fluka treatments.…”

Ácidos naftênicos no petróleo

“…Fórmula empírica e massas moleculares (M) dos ácidos naftênicos que têm a fórmula C n H 2n+Z O 2 com n número de carbonos (17)(18)(19)(20)(21)(22)(23)(24)(25) O efeito de naftenatos de sódio no transporte de água e nos processos de troca gasosa foi examinado em raízes e folhas de álamos, por Kamaluddin e Zwiazek, 54 que concluíram que houve uma inibição metabólica causada pelos sais sódicos de ácidos naftênicos, manifestada na forma de redução de atividade de água nas raízes, trocas gasosas e crescimento das folhas.…”