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Flavonol is an important functional bioactive substance in peanut seeds, and plays important roles responding to abiotic stress. The flavonol content is closely related to the activity and regulation of gene expression patterns of flavonol synthase (FLS). In this study, eight FLS genes,  AhFLS s were cloned and their expression characterization in different peanut organ and seedling under different abiotic stress were conducted. The results showed that the expressions levels of  AhFLSs  were differed in all assayed peanut organs and seedlings under abiotic stress treatments. Expression levels of  AhFLS2 ,  AhFLS3 ,  AhFLS4 , and  AhFLS6  were higher than those of other  AhFLSs . The flavonol contents of peanut organs and seedlings under different abiotic stress were also determined using high performance liquid chromatography (HPLC). Dried mature peanut seeds were the organ tissue with the highest flavonol content, and flavonol content increased with seed development. Under abiotic stress treatments, the types of flavonols induced differed among stress treatments. Correlation analysis results suggested that eight  AhFLS  genes may have different functions in peanut. Moreover, changes in the expression of the eight genes appear to has substrate preference. These results can lay the foundation for the study of improving nutritional value of peanut seed and resistance of peanut plant.

Molecular cloning and expression characterization of flavonol synthase genes in peanut (Arachis hypogaea)