Shoot thermosensors do not fulfil the same function in the root

Abstract

Increasing ambient temperature within the physiological, nonstressful, range promotes the growth of the hypocotyl (Gray et al., 1998) and of the primary root (Hanzawa et al., 2013), whilst reducing the expansion of the cotyledons (Hahm et al., 2020) of Arabidopsis thaliana seedlings.We currently know three thermosensors, phytochrome B (phyB) (Jung et al., 2016; Legris et al., 2016), EARLY FLOWERING 3 (ELF3) (Jung et al., 2020) and PHYTOCHROME INTERACTING FACTOR 7 (PIF7) (Chung et al., 2020), which were uncovered by their role in the control of hypocotyl growth.The root captures water and nutrients and provides an anchorage to the soil. Given these crucial functions, there is a growing interest in understanding the mechanisms involved in the control of primary root elongation by temperature (Hanzawa et al., 2013; Wang et al., 2016; Ibañez et al., 2017; Martins et al., 2017; Yang et al., 2017; Zhu et al., 2018; Fei et al., 2019; Feraru et al., 2019; Gaillochet et al., 2020; Fonseca de Lima et al., 2021; Lee et al., 2021). The aim of this work was to investigate whether the shoot thermosensors phyB, EFL3 and PIF7 fulfil the same function in the root.