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Transgenic apple calli overexpressing beta-glucosidase 40 ( MdBGLU40), which encodes the enzyme for coumarin synthesis, contained higher levels of coumarin and exhibited high resistance to C. mali growth in HK tissues, and exogenous application could improve the C. Among them, the physiological concentration of coumarin (1,2-benzopyrone) became sufficient to inhibit C. Further multiomics revealed that the phenylpropanoid pathway was reprogrammed by increasing K content from low-K (LK, 4.30 g/kg) status, leading to increases of 18 antifungal chemicals. We detected a suite of resistance events in HK apple tissues, including upregulation of resistance genes, callose deposition, and formation of ligno-suberized tissues. The resistance was impeded when blocking K channels, leading to susceptibility even under HK conditions. Here, we found that HK (9.30 g/kg) apple tissues exhibited high disease resistance. mali under high-K (HK) status remain unknown. However, the underlying mechanisms of apple resistance to C. Adding potassium (K) to apple trees can effectively control this disease. Cytospora canker, caused by Cytospora mali, is the most destructive disease in production of apples ( Malus domestica).
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