Nitric oxide is associated with strigolactone and karrikin signal transduction in <i>Arabidopsis</i> roots
Dóra Oláh, Árpád Molnár, Vilmos Soós, Zsuzsanna Kolbert
Abstract
Nitric oxide (NO), strigolactones (SLs) and karrikins (KARs) are bioactive signal molecules controlling root morphology.Our knowledge regarding the signal interplay of NO with SLs or KARs is limited.Our previous results pointed out that there is signal interplay between SL and S-nitrosoglutathione reductase (GSNOR)-mediated NO/Snitrosothiol (SNO) levels in Arabidopsis .In this addendum, we further prove that the pharmacological increment of SL levels by the application of rac -GR24 decreases GSNOR abundance, while reducing SL synthesis by TIS108 intensifies GSNOR protein level and possibly promotes NO signaling in Arabidopsis .Additionally, we observed that the endogenous NO level in the roots of htl-3 (KAR receptor) and d14 (SL receptor) mutants is significantly higher compared to the wild-type.These results, together with the previous ones, confirm the interplay of GSNOR-regulated NO/SNO signaling with SL-and KAR-dependent signal transduction in Arabidopsis .