FIGURE 6.

The relationship of the factors including CaHSL1 and CaWRKY40 under HTHH conditions. Upon the challenge of HTHH, CaWRKY40 or other transcription factors such as HSFs are transcriptionally upregulated in some way, which in turn activate the transcription of CaHSL1. The upregulated CaHSL1 might positively modulate basal and acquired thermotolerance by activating the downstream signaling cascades. Solid line indicates direct effect, dotted lines indicate indirect or speculative relationships. HSFs, heat shock factors; HSPs, Heat shock proteins; HTHH, high temperature and high humidity.