Integrated analysis of physiological, endogenous phytohormones, and transcriptomics reveals the effects of exogenous CPPPU on sweet potato agronomic traits.

After foliar spraying with 9 mg/L CPPU, the levels of GA-like hormones, auxin, and ABA in stem tips and young roots show a decreasing trend, while CKs-like hormones show an increasing trend.

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The 6 mg/L and 9 mg/L CPPU treatments significantly increased the soluble sugar content of sweet potatoes compared to the control group, by 3.44% and 16.9% respectively; the 3 mg/L and 12 mg/L CPPU treatments showed a decreasing trend, decreasing by 0.36% and 1.88% compared to the control group, with no significant difference observed.

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Three types of CKs-tZR, iPR, and 1-aminocyclopropane-1-carboxylic acid—showed significant increases compared to the control group, with differences being highly significant.

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