ROS signaling as common element in low oxygen and heat stresses

► The presence of ROS-related genes in response to low O2 has been observed. ► An overlap between O2 deprivation and heat stress has been proved. ► The site of ROS production during low O2 and heat is still a matter of discussion. ► Both O2 deprivation and heat have been shown to induce HSFs and HSPs. ► HSFs likely play a central role in heat and low O2 enhanced plant tolerance.