Functional Diversification of the Dihydroflavonol 4-Reductase from Camellia nitidissima Chi. in the Control of Polyphenol Biosynthesis

被引:12
|
作者
Jiang, Lina [1 ,2 ]
Fan, Zhengqi [1 ,2 ]
Tong, Ran [1 ]
Zhou, Xingwen [3 ]
Li, Jiyuan [1 ]
Yin, Hengfu [1 ,2 ]
机构
[1] Chinese Acad Forestry, Res Inst Subtrop Forestry, State Key Lab Tree Genet & Breeding, Hangzhou 311400, Peoples R China
[2] Chinese Acad Forestry, Res Inst Subtrop Forestry, Key Lab Forest Genet & Breeding, Hangzhou 311400, Peoples R China
[3] Yulin Normal Univ, Coll Biol & Pharm, Yulin 537000, Peoples R China
关键词
floral pigmentation; dihydroflavonol; 4-reduetase; Camellia nitidissima Chi; polyphenols; anthocyanins; ANTHOCYANIN BIOSYNTHESIS; FLAVONOL SYNTHASE; COLORFUL MODEL; EXPRESSION; GENE; CDNA; LOCALIZATION; BIOCHEMISTRY; EVOLUTION; PIGMENTS;
D O I
10.3390/genes11111341
中图分类号
Q3 [遗传学];
学科分类号
071007 ; 090102 ;
摘要
Plant secondary metabolism is complex in its diverse chemical composition and dynamic regulation of biosynthesis. How the functional diversification of enzymes contributes to the diversity is largely unknown. In the flavonoids pathway, dihydroflavonol 4-reductase (DFR) is a key enzyme mediating dihydroflavanol into anthocyanins biosynthesis. Here, the DFR homolog was identified from Camellia nitidissima Chi. (CnDFR) which is a unique species of the genus Camellia with golden yellow petals. Sequence analysis showed that CnDFR possessed not only conserved catalytic domains, but also some amino acids peculiar to Camellia species. Gene expression analysis revealed that CnDFR was expressed in all tissues and the expression of CnDFR was positively correlated with polyphenols but negatively with yellow coloration. The subcellular localization of CnDFR by the tobacco infiltration assay showed a likely dual localization in the nucleus and cell membrane. Furthermore, overexpression transgenic lines were generated in tobacco to understand the molecular function of CnDFR. The analyses of metabolites suggested that ectopic expression of CnDFR enhanced the biosynthesis of polyphenols, while no accumulation of anthocyanins was detected. These results indicate a functional diversification of the reductase activities in Camellia plants and provide molecular insights into the regulation of floral color.
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页码:1 / 12
页数:12
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