Functional Characterization of a Dihydroflavanol 4-Reductase from the Fiber of Upland Cotton (Gossypium hirsutum).

Functional Characterization of a Dihydroflavanol 4-Reductase from the Fiber of Upland Cotton (Gossypium hirsutum).
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来自陆地棉(Gossypium hirsutum)纤维的二氢黄烷醇 4-还原酶的功能表征

DOI:
10.3390/molecules21020032
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发表时间:
2016-01-26
期刊:
Molecules (Basel, Switzerland)
影响因子:
--
通讯作者:
Wu JH
Wu JH
中科院分区:
其他
文献类型:
--
作者:
Wang L;Zhu Y;Wang P;Fan Q;Wu Y;Peng QZ;Xia GX;Wu JH

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二氢黄烷醇4-还原酶(DFR)是参与两种多酚类物质(花青素和原花青素)生物合成的关键酶,但在棉花中尚未发现。本研究从高地棉纤维发育过程中克隆了一个DFR cDNA同源序列(命名为GhDFR 1)。通过病毒介导的基因沉默使棉花GhDFR 1基因沉默,可显著降低花色素苷和多胺的积累。更有趣的是,基于LC-MS分析,两种PA单体(-)-epicatachin和(-)-epigallocatachin)在GhDFR 1沉默植物的纤维中的含量显著降低,但与用空载体感染的对照植物相比,存在两种新单体(-)-catachin和(-)-gallocatachin。GhDFR 1在拟南芥TT 3突变体中的异位表达使多胺合成途径得以重建,并导致多胺在种皮中的积累。综上所述,这些数据表明GhDFR 1有助于棉花中花青素和多胺的生物合成。
Dihydroflavanol 4-reductase (DFR) is a key later enzyme involved in two polyphenols’ (anthocyanins and proanthocyanidins (PAs)) biosynthesis, however it is not characterized in cotton yet. In present reports, a DFR cDNA homolog (designated as GhDFR1) was cloned from developing fibers of upland cotton. Silencing GhDFR1 in cotton by virus-induced gene silencing led to significant decrease in accumulation of anthocyanins and PAs. More interestingly, based on LC-MS analysis, two PA monomers, (–)-epicatachin and (–)-epigallocatachin, remarkably decreased in content in fibers of GhDFR1-silenced plants, but two new monomers, (–)-catachin and (–)-gallocatachin were present compared to the control plants infected with empty vector. The ectopic expression of GhDFR1 in an Arabidopsis TT3 mutant allowed for reconstruction of PAs biosynthesis pathway and led to accumulation of PAs in seed coat. Taken together, these data demonstrate that GhDFR1 contributes to the biosynthesis of anthocyanins and PAs in cotton.
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