LcMYB1 Is a Key Determinant of Differential Anthocyanin Accumulation among Genotypes, Tissues, Developmental Phases and ABA and Light Stimuli in Litchi chinensis

Lai, Bo; Li, Xiaojing; Hu, Bing; Qin, Yonghua; Huang, Xu-Ming; Wang, Huicong

doi:10.1371/journal.pone.0086293

Cited by 117 publications

(115 citation statements)

References 63 publications

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“…Among these, co-expression of two classes of TFs, R2R3-MYB, and bHLH, is indispensable for the activation of anthocyanin biosynthetic genes (Bovy et al 2002;Butelli et al 2008). Also, work in Chinese berry and Litchi chinensis reported a requirement for an endogenous bHLHtype TF as a binding partner for anthocyanin-promoting MYBs (Huang et al 2013a;Lai et al 2014).…”

Section: Discussionmentioning

confidence: 99%

Activation of anthocyanin biosynthesis by expression of the radish R2R3-MYB transcription factor gene RsMYB1

et al. 2015

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RsMYB1, a MYB TF of red radish origin, was characterized as a positive regulator to transcriptionally activate the anthocyanin biosynthetic machinery by itself in Arabidopsis and tobacco plants. Anthocyanins, providing the bright red-orange to blue-violet colors, are flavonoid-derived pigments with strong antioxidant activity that have benefits for human health. We isolated RsMYB1, which encodes an R2R3-MYB transcription factor (TF), from red radish plants (Raphanus sativus L.) that accumulate high levels of anthocyanins. RsMYB1 shows higher expression in red radish than in common white radish, in both leaves and roots, at different growth stages. Consistent with RsMYB1 function as an anthocyanin-promoting TF, red radishes showed higher expression of all six anthocyanin biosynthetic and two anthocyanin regulatory genes. Transient expression of RsMYB1 in tobacco showed that RsMYB1 is a positive regulator of anthocyanin production with better efficiency than the basic helix-loop-helix (bHLH) TF gene B-Peru. Also, the synergistic effect of RsMYB1 with B-Peru was larger than the effect of the MYB TF gene mPAP1D with B-peru. Arabidopsis plants stably expressing RsMYB1 produced red pigmentation throughout the plant, accompanied by up-regulation of the six structural and two regulatory genes for anthocyanin production. This broad transcriptional activation of anthocyanin biosynthetic machinery in Arabidopsis included up-regulation of TRANSPARENT TESTA8, which encodes a bHLH TF. These results suggest that overexpression of RsMYB1 promotes anthocyanin production by triggering the expression of endogenous bHLH genes as potential binding partners for RsMYB1. In addition, RsMYB1-overexpressing Arabidopsis plants had a higher antioxidant capacity than did non-transgenic control plants. Taken together, RsMYB1 is an actively positive regulator for anthocyanins biosynthesis in radish plants and it might be one of the best targets for anthocyanin production by single gene manipulation being applicable in diverse plant species.

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Section: Discussionmentioning

confidence: 99%

Activation of anthocyanin biosynthesis by expression of the radish R2R3-MYB transcription factor gene RsMYB1

et al. 2015

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“…Similarly, in grapevine ( Vitis vinifera ), VvMYBA1 and VvMYBA2 are responsible for anthocyanin biosynthesis in red-skinned cultivars [14]. GmMYB10 , MrMYB1 , PcMYB1 , and LcMYB1 are involved in the anthocyanin biosynthetic pathway in mangosteen ( Garcinia mangostana ), Chinese bayberry ( Myrica rubra ), pear ( Pyrus pyrifolia ), and litchi (Litchi chinensis ), respectively [15,16,17,18]. In maize ( Zea mays ) seeds, anthocyanin biosynthesis is regulated by C1 [19].…”

Section: Discussionmentioning

confidence: 99%

Transcriptome Analysis Identifies Key Candidate Genes Mediating Purple Ovary Coloration in Asiatic Hybrid Lilies

Yang

Yuan

et al. 2016

IJMS

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Lily tepals have a short lifespan. Once the tepals senesce, the ornamental value of the flower is lost. Some cultivars have attractive purple ovaries and fruits which greatly enhance the ornamental value of Asiatic hybrid lilies. However, little is known about the molecular mechanisms of anthocyanin biosynthesis in Asiatic hybrid lily ovaries. To investigate the transcriptional network that governs purple ovary coloration in Asiatic hybrid lilies, we obtained transcriptome data from green ovaries (S1) and purple ovaries (S2) of Asiatic “Tiny Padhye”. Comparative transcriptome analysis revealed 4228 differentially expressed genes. Differential expression analysis revealed that ten unigenes including four CHS genes, one CHI gene, one F3H gene, one F3′H gene, one DFR gene, one UFGT gene, and one 3RT gene were significantly up-regulated in purple ovaries. One MYB gene, LhMYB12-Lat, was identified as a key transcription factor determining the distribution of anthocyanins in Asiatic hybrid lily ovaries. Further qPCR results showed unigenes related to anthocyanin biosynthesis were highly expressed in purple ovaries of three purple-ovaried Asiatic hybrid lilies at stages 2 and 3, while they showed an extremely low level of expression in ovaries of three green-ovaried Asiatic hybrid lilies during all developmental stages. In addition, shading treatment significantly decreased pigment accumulation by suppressing the expression of several unigenes related to anthocyanin biosynthesis in ovaries of Asiatic “Tiny Padhye”. Lastly, a total of 15,048 Simple Sequence Repeats (SSRs) were identified in 13,710 sequences, and primer pairs for SSRs were designed. The results could further our understanding of the molecular mechanisms of anthocyanin biosynthesis in Asiatic hybrid lily ovaries.

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“…Athocyanins biosynthesis is regulated by enzyme-coding structural genes, including chalcone synthase (CHS), chalcone isomerase (CHI), flavonoid-3′-hydroxylase (F3’H), flavonoid-3′,5′-hydroxylase (F3′5′H), flavanone 3-hydroxylase (F3H), dihydroflavonol 4-reductase (DFR), anthocyanidin synthase (ANS), UDP-glucose: flavonoid 3- O -glucosyltransferase (UFGT), and is also orchestrated at the transcriptional level by MBW transcription factor (TF) complexes consisting of MYB, bHLH (basic helix-loop-helix) and WD40 (Koes et al, 2005; Saito et al, 2013; Xu et al, 2015). Recent researches have demonstrated that the MBW complex regulates the genes that encode enzymes specifically at the late steps of the anthocyanin pathway, and the MYB TF s have been identified to be the major determinant regulatory genes in the biosynthetic steps of anthocyanin metabolism (Gonzalez et al, 2008; Lai et al, 2014; Shen et al, 2014). AtPAP1 ( AtMYB75 ), the known anthocyanin regulator originally defined in Arabidopsis, has been shown to effectively induce anthocyanin accumulation in various plant species (Zuluaga et al, 2008; Rowan et al, 2009; Li X. et al, 2010; Qiu et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Identification of MicroRNAs and Their Target Genes Related to the Accumulation of Anthocyanins in Litchi chinensis by High-Throughput Sequencing and Degradome Analysis

Lai

et al. 2017

Front. Plant Sci.

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Litchi (Litchi chinensis Sonn.) is an important subtropical fruit in southern China and the fruit pericarp has attractive red skin at maturity, which is provided by anthocyanins accumulation. To understand the anthocyanin biosynthesis at post-transcriptional level, we investigated the roles of microRNAs (miRNAs) during fruit coloring. In the present study, four small RNA libraries and a mixed degradome library from pericarps of ‘Feizixiao’ litchi at different developmental phases were constructed and sequenced by Solexa technology. A total of 78 conserved miRNAs belonging to 35 miRNA families and 41 novel miRNAs were identified via high-throughput sequencing, and 129 genes were identified as their targets by the recently developed degradome sequencing. miR156a and a novel microRNA (NEW41) were found to be differentially expressed during fruit coloring, indicating they might affect anthocyanin biosynthesis through their target genes in litchi. qRT-PCR analysis confirmed the expression changes of miR156a and the novel microRNA (NEW41) were inversely correlated with the expression profiles of their target genes LcSPL1/2 and LcCHI, respectively, suggesting regulatory roles of these miRNAs during anthocyanin biosynthesis. The target genes of miR156a, LcSPL1/2, encode transcription factors, as evidenced by a localization in the nucleus, that might play roles in the regulation of transcription. To further explore the relationship of LcSPL1/2 with the anthocyanin regulatory genes, yeast two-hybrid and BiFC analyses showed that LcSPL1 proteins could interact with LcMYB1, which is the key regulatory gene in anthocyanin biosynthesis in litchi. This study represents a comprehensive expression profiling of miRNAs in anthocyanin biosynthesis during litchi fruit maturity and confirmed that the miR156- SPLs module was conserved in anthocyanin biosynthesis in litchi.

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LcMYB1 Is a Key Determinant of Differential Anthocyanin Accumulation among Genotypes, Tissues, Developmental Phases and ABA and Light Stimuli in Litchi chinensis

Cited by 117 publications

References 63 publications

Activation of anthocyanin biosynthesis by expression of the radish R2R3-MYB transcription factor gene RsMYB1

Activation of anthocyanin biosynthesis by expression of the radish R2R3-MYB transcription factor gene RsMYB1

Transcriptome Analysis Identifies Key Candidate Genes Mediating Purple Ovary Coloration in Asiatic Hybrid Lilies

Identification of MicroRNAs and Their Target Genes Related to the Accumulation of Anthocyanins in Litchi chinensis by High-Throughput Sequencing and Degradome Analysis

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