Title of article :
Differential stress-response expression of two flavonol synthase genes and accumulation of flavonols in tartary buckwheat
Author/Authors :
Xiaohua Li، نويسنده , , Yeon Bok Kim، نويسنده , , Yeji Kim، نويسنده , , Shicheng Zhao، نويسنده , , Haeng Hoon Kim، نويسنده , , Eunsook Chung، نويسنده , , Jai-Heon Lee، نويسنده , , Sang-Un Park، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2013
Abstract :
Flavonoids are ubiquitously present in plants and play important roles in these organisms as well as in the human diet. Flavonol synthase (FLS) is a key enzyme of the flavonoid biosynthetic pathway, acting at the diverging point into the flavonol subclass branch. We isolated and characterized a FLS isoform gene, FtFLS2, from tartary buckwheat (Fagopyrum tataricum). FtFLS2 shares 48% identity and 67% similarity with the previously reported FtFLS1, whereas both genes share 47–65% identity and 65–69% similarity with FLSs from other plant species. Using quantitative real-time PCR and high-performance liquid chromatography (HPLC), the expression of FtFLS1/2 and the production of 3 main flavonols (kaempferol, myricetin and quercetin) was detected in roots, leaves, stems, flowers and different stages of developing seeds. The relationship between the expression of the 2 FLS genes and the accumulation of the 3 basic flavonols was analyzed in 2 tartary buckwheat cultivars. FtFLS1 and FtFLS2 exhibited differential transcriptional levels between the tartary buckwheat cultivars ‘Hokkai T10’ and ‘Hokkai T8’. Generally, higher transcript levels of FtFLS1 and FtFLS2 and a higher amount of flavonols were observed in the ‘Hokkai T10’ cultivar than ‘Hokkai T8’. The content of flavonols showed tissue-specific accumulation between the 2 cultivars. The transcription of FtFLS1 was inhibited by the exogenous application of abscisic acid (ABA), salicylic acid (SA) and sodium chloride (NaCl), while FtFLS2 was not affected by ABA but up-regulated by SA and NaCl. These data indicate that the 2 FtFLS isoforms of buckwheat have different functions in the response of buckwheat to environmental stress.
Keywords :
Flavonol synthase , Gene expression , tartary buckwheat , Flavonol biosynthesis , Environmental Stress
Journal title :
Journal of Plant Physiology
Journal title :
Journal of Plant Physiology