Humic substances induce lateral root formation and expression of the early auxin-responsive IAA19 gene and DR5 synthetic element in Arabidopsis

Plant Biology
S TrevisanS Nardi

Abstract

Humic substances (HS) have positive effects on plant physiology, but the molecular mechanisms underlying these events are only partially understood. HS exert auxin-like activity, but data supporting this hypothesis are under debate. To investigate the auxin-like activity of HS, we studied their biological effect on lateral root initiation in Arabidopsis thaliana. To this aim we characterised HS by means of DRIFT and (13)C CP/MAS NMR spectroscopy, and measured their endogenous content of IAA. We then utilised a combination of genetic and molecular approaches to unravel HS auxin activity in the initiation of lateral roots. The data obtained using specific inhibitors of auxin transport or action showed that HS induce lateral root formation mostly through their 'auxin activity'. These findings were further supported by the fact that HS used in this study activated the auxin synthetic reporter DR5::GUS and enhanced transcription of the early auxin responsive gene IAA19.

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Citations

May 19, 2010·Journal of Chemical Ecology·Michela SchiavonSerenella Nardi
Jan 14, 2011·Bioscience, Biotechnology, and Biochemistry·Flávio Couto CordeiroSonia Regina de Souza
Jun 26, 2012·The Science of the Total Environment·Michal BittnerChristian E W Steinberg
Jun 29, 2016·Scientific Reports·Natalia A KulikovaIrina V Perminova
Feb 11, 2016·Scientific Reports·Andrés Calderín GarcíaRicardo Luis Louro Berbara
Jun 11, 2019·Frontiers in Plant Science·Laura ZaninRoberto Pinton
Oct 19, 2019·Plant Direct·Maite OlaetxeaJosé María García-Mina
Mar 18, 2010·Journal of Agricultural and Food Chemistry·Leonardo Barros DobbssArnoldo R Façanha
Jun 3, 2021·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Natalia A Kulikova, Irina V Perminova

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