Nitric oxide-fixation by non-symbiotic haemoglobin proteins in Arabidopsis thaliana under N-limited conditions
Gitto Thomas Kuruthukulangarakoola, Jiangli Zhang, Andreas Albert, Barbro Winkler, Hans Lang, Franz Buegger, Frank Gaupels, Werner Heller, Bernhard Michalke, Hakan Sarioglu, Jörg-Peter Schnitzler, Kim Henrik Hebelstrup, Jörg Durner and Christian Lindermayr
Version of Record online: 25 JUL 2016 | DOI: 10.1111/pce.12773
This study reports about a NO-fixing mechanism in Arabidopsis, which allows the fixation of atmospheric NO into nitrogen metabolism. Non-symbiotic haemoglobin class 1 and class 2 were identified as key proteins of the NO-fixation pathway converting NO to nitrate, which is further introduced into the N-metabolism. This mechanism is probably important under conditions with limited N supply via the soil. Moreover, the plant-based NO uptake lowers the concentration of insanitary atmospheric NOx, and in this context, NO-fixation can be beneficial to air quality.