Portal de Periódicos da CAPES

Accumulation of flavonoids and expression of flavonoid biosynthetic genes in tartary and rice-tartary buckwheat

2012; Elsevier BV; Volume: 47; Issue: 12 Linguagem: Inglês

10.1016/j.procbio.2012.09.009

1873-3298

Xiaohua Li, Nam Il Park, Yeon Bok Kim, Haeng Hoon Kim, Cheol Ho Park, Qi Wu, Sang Un Park,

Phytochemicals and Antioxidant Activities

Tartary buckwheat seeds are highly nutritious and excellent dietary sources of phenolic compounds. Rice-tartary buckwheat is a special type of tartary buckwheat with a non-adhering hull trait. Here, we investigated the levels of expression of genes involved in the flavonoid biosynthetic pathway in common tartary and rice-tartary buckwheat. The flavonoid biosynthetic genes, from FtPAL to FtANS, showed different expression levels, especially in the reproductive organs of the 2 cultivars. The transcription levels of these genes, except FtC4H and FtANS, were higher in the mature seeds of rice-tartary buckwheat than in those of common buckwheat. We also analyzed the flavonoid compounds found in the different organs of common tartary buckwheat and rice-tartary buckwheat. Even though the content of rutin was similar in both the cultivars, the distribution of the 3 main flavonoids—rutin, quercetin, and kaempferol—was different in the 2 cultivars, both across organs and within the seed. These results indicate that in the 2 tartary buckwheat cultivars, flavonoid biosynthesis is carried out by different mechanisms.