Abstract
D-limonene is the main component of citrus essential oils. In the monoterpene biosynthetic pathway, geranyl diphosphate reacts with monoterpenes to form the prenyl-carbocation intermediate to produce d-limonene. In this study, d-limonene synthase (FcLS) genes were first isolated from Rongan kumquat (Fortunella crassifolia Swingle). Sequencing analysis revealed that the open reading frames of 18 FcLS genes contain 12 single nucleotide polymorphisms, which resulted in the variation of FcLS proteins, indicating that the limonene synthase genes are a large family in F. crassifolia. This phenomenon has not been reported in Citrus. The predicted FcLS proteins showed a high amino acid sequence identity with other Citrus limonene synthases and also had the typical structures of limonene synthase protein. FcLS1 was validated to be a functional d-limonene synthase by prokaryotic expression.
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