A putative regulatory work model showing how AMHA is involved in mitigating cold damage in tea plant. (IMAGE)
Caption
A putative regulatory work model showing how AMHA is involved in mitigating cold damage in tea plant. AMHA pretreatment elicits physiological responses, including enhanced antioxidant enzymes, chloroplast protection, and osmotic adjustment, while also affecting the expression levels of glutathione S-transferase (GST). AMHA significantly increases the levels of catalase (CAT), peroxidase (POD), superoxide dismutase (SOD), ascorbate peroxidase (APX), anthocyanins, β-carotenes, ascorbic acid (AsA), glutathione (GSH), and soluble sugars, which are related to cold stress resistance. This alleviates physiological and metabolic damages, such as impaired photosynthetic efficiency, increased reactive oxygen species (ROS), and disrupted osmotic stability, caused by cold stress. AMHA mitigates the damage of cold stress by inducing the expression levels of CsGSTU7 and other key genes, as well as by stimulating the synthesis of the AsA-GSH system. AMHA maintains normal tea plant growth under cold-stress exposure by inducing genes related to cold resistance and osmolyte production.
Credit
Horticulture Research
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CC BY