Differential Expression of Flavonoid Biosynthesis Genes and Accumulation of Phenolic Compounds in Common Buckwheat (Fagopyrum esculentum)
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Abstract
Common buckwheat (Fagopyrum esculentum) is a short-season grain crop that is a source of rutin and other phenolic compounds. In this study, we isolated the cDNAs of 11 F. esculentum enzymes in the flavonoid biosynthesis pathway, namely, phenylalanine ammonia lyase (PAL), cinnamate 4-hydroxylase (C4H), 4-coumarate:CoA ligase (4CL) 1 and 2, chalcone synthase (CHS), chalcone isomerase (CHI), flavone 3-hydroxylase (F3H), flavonoid 3'-hydroxylase (F3'H), flavonol synthase (FLS) 1 and 2, and anthocyanidin synthase (ANS). Quantitative real-time polymerase chain reaction analysis showed that these genes were most highly expressed in the stems and roots. However, high performance liquid chromatography analysis indicated that their flavonoid products, such as rutin and catechin, accumulated in the flowers and leaves. These results suggested that flavonoids may be transported within F. esculentum. In addition, light and dark growth conditions affected the expression levels of the biosynthesis genes and accumulation of phenolic compounds in F. esculentum sprouts.
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