Fig. 6
The supposed responsive mechanism of the paper mulberry exposed to cold stress. After signal reception, stress-activated Ca2+ signaling, ROS and hormone signaling modulate the expression of stress-responsive transcription factors, kinases, GST and so on. And then activated the expression of genes related to primary and secondary metabolism. The physiological changes mainly included chloroplast malfunction, starch accumulation, cell wall and membrane reconfiguration. Taken together, they endowed the paper mulberry with the new growth homeostasis under cold stress