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首页> 外文期刊>Journal of Experimental Botany >A NAC transcription factor and its interaction protein hinder abscisic acid biosynthesis by synergistically repressing NCED5 in Citrus reticulata
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A NAC transcription factor and its interaction protein hinder abscisic acid biosynthesis by synergistically repressing NCED5 in Citrus reticulata

机译:通过协同抑制NCED5在柑橘reticulata中,NAC转录因子及其相互作用蛋白阻碍脱离酸生物合成

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摘要

Although abscisic acid (ABA) is a vital regulator of fruit ripening and several transcription factors have been reported to regulate ABA biosynthesis, reports of the effect of ABA on citrus ripening and the regulation of its biosynthesis by a multiple-transcription-factor complex are scarce. In the present study, a systematic metabolic, cytological, and transcriptome analysis of an ABA-deficient mutant (MT) of Citrus reticulata cv. Suavissima confirmed the positive effect of ABA on the citrus ripening process. The analysis of transcriptome profiles indicated that CrNAC036 played an important role in the ABA deficiency of the mutant, most likely due to an effect on the expression of 9-cis-epoxycarotenoid dioxygenase 5 (CrNCED5). Electrophoretic mobility shift assays and dual luciferase assays demon-strated that CrNAC036 can directly bind and negatively regulate CrNCED5 expression. Furthermore, yeast two-hybrid, bimolecular fluorescence complementation, and dual luciferase assays demonstrated that CrNAC036 interacted with CrMYB68, also down-regulating the expression of CrNCED5. Taken together, our results suggest that CrNAC036 and CrMYB68 synergistically inhibit ABA biosynthesis in citrus fruit by regulating the expression of CrNCED5.
机译:虽然脱落酸(ABA)是果实成熟的重要调节剂,但据报道了几种转录因子调节ABA生物合成,但ABA对柑橘成熟的影响和通过多转录因子复合物的生物合成的调节是稀缺的。在本研究中,柑橘reticulata cv的ABA缺陷型突变体(MT)的系统代谢,细胞学和转录组分析。 Suavissima证实了ABA对柑橘成熟过程的积极作用。转录组谱的分析表明,CRNAC036在突变体的ABA缺乏中发挥了重要作用,最有可能是由于对9-CIS-环氧丙酮蛋白二氧酶5(CRNCER5)的表达的影响。电泳迁移率移位测定和双荧光素酶测定法测定CRNAC036可以直接结合和负调节CRNCED5表达。此外,酵母双杂化,双分子荧光互补和双荧光素酶测定证明CRNAC036与CRMYB68相互作用,同时也降低了CRNCED5的表达。我们的结果表明,CRNAC036和CRMYB68通过调节CRNCED5的表达,CRNAC036和CRMYB68协同抑制柑橘类水果中的ABA生物合成。

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