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Phosphorus (P) is an essential macronutrient for plant growth and development. The concentration of flavonol, a natural plant antioxidant, is closely related to phosphorus nutritional status. However, the regulatory networks of flavonol biosynthesis under low Pi stress are still unclear. In this study, we identified a PFG-type MYB gene,  NtMYB12 , whose expression was significantly up-regulated under low Pi conditions. Overexpression of  NtMYB12  dramatically increased flavonol concentration and the expression of certain flavonol biosynthetic genes ( NtCHS ,  NtCHI , and  NtFLS ) in transgenic tobacco. Moreover, overexpression of  NtMYB12  also increased the total P concentration and enhanced tobacco tolerance of low Pi stress by increasing the expression of  Pht1 -family genes ( NtPT1  and  NtPT2 ). We further demonstrated that  NtCHS- overexpressing plants and  NtPT2- overexpressing plants also had increased flavonol and P accumulation and higher tolerance to low Pi stress, showing a similar phenotype to  NtMYB12 -overexpressing transgenic tobacco under low Pi stress. These results suggested that tobacco  NtMYB12  acts as a phosphorus starvation response enhancement factor and regulates  NtCHS  and  NtPT2  expression, which results in increased flavonol and P accumulation and enhances tolerance to low Pi stress.

NtMYB12 Positively Regulates Flavonol Biosynthesis and Enhances Tolerance to Low Pi Stress in Nicotiana tabacum