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The bHLH Transcription Factors MYC2, MYC3, and MYC4 Are Required for Jasmonate-Mediated Inhibition of Flowering in Arabidopsis 被引量:22
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作者 Houping Wang Yang Li +3 位作者 Jinjing Pan Dengji Lou Yanru Hu Diqiu Yu 《Molecular Plant》 SCIE CAS CSCD 2017年第11期1461-1464,共4页
Dear Editor,In plants, the floral transition is flexibly controlled by various environmental conditions and endogenous developmental cues. In Arabidopsis, six major flowering pathways respond to changes in these facto... Dear Editor,In plants, the floral transition is flexibly controlled by various environmental conditions and endogenous developmental cues. In Arabidopsis, six major flowering pathways respond to changes in these factors (Fornara et al., 2010). The photoperiod, vernalization, and ambient pathways monitor exogenous signals from the environment such as day length, minimum winter temperature, and ambient temperature (Fornara et al., 2010). By contrast, the autonomous, gibberellin, and age pathways respond to endogenous cues linked to developmental status (Fornara et al., 2010). Accumulating evidence indicates that the six flowering pathways converge in a network to regulate floral integrator genes FLOWERING LOCUS T (FT), TWIN SISTER OF FT (TSF), and SUPPRESSOR OF OVEREXPRESSION OF CONSTANS1 (Fornara et al., 2010). 展开更多
关键词 The bhlh transcription factors MYC2 MYC3 MYC4 Are Required for Jasmonate-Mediated Inhibition of Flowering in Arabidopsis
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Deletion of a 1,049 bp sequence from the 5′UTR upstream of the SiHEC3 gene induces a seed non-shattering mutation in sesame
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作者 Ming Ju Guiting Li +9 位作者 Qiuzhen Tian Hengchun Cao Qin Ma Yinghui Duan Hui Guo Zhanyou Zhang Yingying Huang Huili Wang Haiyang Zhang Hongmei Miao 《Journal of Integrative Agriculture》 SCIE CAS CSCD 2024年第8期2589-2604,共16页
Sesame is a labor intensive crop with limited mechanized harvesting mainly due to the seed shattering(SS)trait.In this study,we performed a genetic analysis of the seed-shattering resistance(SR)trait with a SR sesame ... Sesame is a labor intensive crop with limited mechanized harvesting mainly due to the seed shattering(SS)trait.In this study,we performed a genetic analysis of the seed-shattering resistance(SR)trait with a SR sesame mutant 12M07.Unlike the SS type,the parenchyma cells in the abscission zone of the 12M07 mutant are arranged loosely but adhere to the seed coat.Inheritance analysis of six generations derived from 12M07(SR)×Xiangcheng Dazibai(SS)showed that the SR trait is recessive and controlled by a single gene pair.Association mapping of the F2population with 888,619 variants(single-nucleotide polymorphisms(SNPs)and insertion-deletion(InDels))and 31,884 structural variations(SVs)determined that only SV12002 in the 5′upstream region of gene Sindi0765000(named SiHEC3)in Chr.3 was significantly associated with the SR trait.SiHEC3 encodes the bHLH transcription factor.A 1,049 bp deletion occurred in the 5′UTR of Sihec3 in 12M07.SiHEC3 is mainly expressed in developing placental tissues,with the expression peaking in capsules at 45 days after pollination.A dual-luciferase reporter assay in tobacco confirmed that the promoter activity of Sihec3 was reduced because of the deletion of the 1,049 bp promoter sequence.Protein–protein interaction network analysis showed that HEC3 is co-expressed with nine key proteins,such as SHATTERPROOF1(SHP1)and SEEDSTICK(STK)which participate in the secondary wall biosynthesis of the abscission layer in plants.The findings of this study show the important function of Sihec3corresponding with the SR trait and supply the genetic information for breeding new varieties that are amenable to mechanized harvesting in sesame and other crops. 展开更多
关键词 sesame(Sesamum indicum L.) association mapping seed shattering structure variation bhlh transcription factor
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FIT interacts with AtbHLH38 and AtbHLH39 in regulating iron uptake gene expression for iron homeostasis in Arabidopsis 被引量:60
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作者 Youxi Yuan Huilan Wu +5 位作者 Ning Wang Jie Li Weina Zhao Juan Du Daowen Wang Hong-QingLing 《Cell Research》 SCIE CAS CSCD 2008年第3期385-397,共13页
Iron is an essential element for plant growth and development. Iron homeostasis in plants is tightly regulated at both transcriptional and posttranscriptional level. Several bHLH transcription factors involved in iron... Iron is an essential element for plant growth and development. Iron homeostasis in plants is tightly regulated at both transcriptional and posttranscriptional level. Several bHLH transcription factors involved in iron homeostasis have been identified recently. However, their regulatory mechanisms remain unknown. In this work, we demonstrate that the transcription factor FIT interacted with AtbHLH38 and AtbHLH39 and directly conferred the expression regulation of iron uptake genes for iron homeostasis in Arabidopsis. Yeast two-hybrid analysis and transient expression in Arabidopsis protoplasts showed that AtbHLH38 or AtbHLH39 interacted with FIT, a central transcription factor involved in iron homeostasis in Arabidopsis. Expression of FIT/AtbHLH38 or FIT/AtbHLH39 in yeast cells activated GUS expression driven by ferric chelate reductase (FRO2) and ferrous transporter (IRT1) promoters. Overexpression of FITwith either AtbHLH38 or AtbHLH39 in plants converted the expression of the iron uptake genes FRO2 and IRT1 from induced to constitutive. Further analysis revealed that FRO2 and IRT1 were not regulated at the posttranscriptional level in these plants because IRT1 protein accumulation and high ferric chelate reductase activity were detected in the overexpression plants under both iron deficiency and iron sufficiency. The double overexpression plants accumulated more iron in their shoots than wild type or the plants overexpressing either AtbHLH38, AtbHLH39 or FIT. Our data support that ferric-chelate reductase FRO2 and ferrous-transporter IRT1 are the targets of the three transcription factors and the transcription of FRO2 and IRT1 is directly regulated by a complex of FIT/AtbHLH38 or FIT/AtbHLH39. 展开更多
关键词 activation of iron uptake genes Arabidipsis thaliana bhlh transcription factor iron homeostasis protein-proteininteraction
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Epigenetic modification associated with climate regulates betulin biosynthesis in birch
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作者 Jiang Wang Bowei Chen +13 位作者 Shahid Ali Tianxu Zhang Yu Wang He Zhang Lishan Wang Yonglan Zhang Linan Xie Tingbo Jiang Jing Yin Heike W.Sederoff Gaurav Zinta Ronald R.Sederoff Yuhua Li Qingzhu Zhang 《Journal of Forestry Research》 SCIE CAS CSCD 2023年第1期21-35,共15页
The Betula genus contains pentacyclic triterpenoid betulin known for its environmental adaptation and medicinal properties.However,the mechanisms underlying betulin biosynthesis responding to climate change remain unc... The Betula genus contains pentacyclic triterpenoid betulin known for its environmental adaptation and medicinal properties.However,the mechanisms underlying betulin biosynthesis responding to climate change remain unclear.In this study,the role of epigenetic modification(DNA methylation) in betulin biosynthesis was examined and how climatic factors influence it.Whole-genome bisulfite sequencing was performed for greenhouse-grown Chinese white birch(Betula platyphylla Sukaczev) treated with DNA methylation inhibitor zebularine(ZEB) and a natural birch population in Northeast China.ZEB treatment significantly affected the CHH methylation level of transposable elements and betulin content in a hormesis dose-dependent manner.The methylation and expression of bHLH9,a key transcriptional factor controlling betulin biosynthesis,were also consistently affected by ZEB treatment as a hormetic dose-response.In the natural population,there was a positive correlation between promoter methylation of bHLH9 and summer precipitation,while winter temperature was negatively correlated.Thus climate-dependent methylation of bHLH9 regulates the expression of downstream genes involved in betulin biosynthesis.This study highlights the role of environmental signals to induce epigenetic changes that result in betulin production,possibly helping to develop resilient plants to combat ongoing climate change and enhance secondary metabolite production. 展开更多
关键词 EPIGENETICS DNA methylation BETULIN bhlh9 transcription factor HORMESIS Climate change Secondary metabolite
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Down-regulation of MeMYB2 leads to anthocyanin accumulation and increases chilling tolerance in cassava(Manihot esculenta Crantz)
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作者 Xin Guo Xiaohui Yu +9 位作者 Chenyu Lin Pingjuan Zhao Bin Wang Liangping Zou Shuxia Li Xiaoling Yu Yinhua Chen Peng Zhang Ming Peng Mengbin Ruan 《The Crop Journal》 SCIE CSCD 2023年第4期1181-1191,共11页
Chilling-induced accumulation of reactive oxygen species(ROS) is harmful to plants,which usually produce anthocyanins to scavenge ROS as protection from chilling stress.As a tropical crop,cassava is hypersensitive to ... Chilling-induced accumulation of reactive oxygen species(ROS) is harmful to plants,which usually produce anthocyanins to scavenge ROS as protection from chilling stress.As a tropical crop,cassava is hypersensitive to chilling,but the biochemical basis of this hypersensitivity remains unclear.We previously generated Me MYB2-RNAi transgenic cassava with increased chilling tolerance.Here we report that Me MYB2-RNAi transgenic cassava accumulated less ROS but more cyanidin-3-O-glucoside than the wild type under early chilling stress.Under this stress,the anthocyanin biosynthesis pathway was more active in Me MYB2-RNAi lines than in the wild type,and several genes involved in the pathway,including Me TT8,were up-regulated by Me MYB2-RNAi in the transgenic cassava.Me MYB2 bound to the Me TT8 promoter and blocked its expression under both normal and chilling conditions,thereby inhibiting anthocyanin accumulation.Me TT8 was shown to bind to the promoter of Dihydroflavonol 4-reductase(Me DFR-2)and increased Me DFR-2 expression.Me MYB2 appears to act as an inhibitor of chilling-induced anthocyanin accumulation during the rapid response of cassava to chilling stress. 展开更多
关键词 CASSAVA Early chilling stress Anthocyanins MeMYB2 bhlh transcription factor
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MdbHLH162 connects the gibberellin and jasmonic acid signals to regulate anthocyanin biosynthesis in apple
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作者 Jian-Ping An Rui-Rui Xu +3 位作者 Xiao-Na Wang Xiao-Wei Zhang Chun-Xiang You Yuepeng Han 《Journal of Integrative Plant Biology》 SCIE CAS CSCD 2024年第2期265-284,共20页
Anthocyanins are secondary metabolites induced by environmental stimuli and developmental signals.The positive regulators of anthocyanin biosynthesis have been reported,whereas the anthocyanin repressors have been neg... Anthocyanins are secondary metabolites induced by environmental stimuli and developmental signals.The positive regulators of anthocyanin biosynthesis have been reported,whereas the anthocyanin repressors have been neglected.Although the signal transduction pathways of gibberellin(GA)and jasmonic acid(JA)and their regulation of anthocyanin biosynthesis have been investigated,the cross-talk between GA and JA and the antagonistic mechanism of regulating anthocyanin biosynthesis remain to be investigated.In this study,we identified the anthocyanin repressor MdbHLH162 in apple and revealed its molecular mechanism of regulating anthocyanin biosynthesis by integrating the GA and JA signals.MdbHLH162 exerted passive repression by interacting with MdbHLH3 and MdbHLH33,which are two recognized positive regulators of anthocyanin biosynthesis.MdbHLH162 negatively regulated anthocyanin biosynthesis by disrupting the formation of the anthocyanin-activated MdMYB1-MdbHLH3/33complexes and weakening transcriptional activation of the anthocyanin biosynthetic genes MdDFR and MdUF3GT by MdbHLH3 and MdbHLH33.The GA repressor MdRGL2a antagonized MdbHLH162-mediated inhibition of anthocyanins by sequestering MdbHLH162 from the MdbHLH162-MdbHLH3/33 complex.The JA repressors MdJAZ1 and MdJAZ2 interfered with the antagonistic regulation of MdbHLH162 by MdRGL2a by titrating the formation of the MdRGL2a-MdbHLH162 complex.Our findings reveal that MdbHLH162 integrates the GA and JA signals to negatively regulate anthocyanin biosynthesis.This study provides new information for discovering more anthocyanin biosynthesis repressors and explores the cross-talk between hormone signals. 展开更多
关键词 anthocyanin biosynthesis bhlh transcription factor GIBBERELLIN jasmonic acid regulatory network transcriptional regulation
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Genome-wide characterization and analysis of b HLH transcription factors in Panax ginseng 被引量:17
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作者 Yang Chu Shuiming Xiao +4 位作者 He Su Baosheng Liao Jingjing Zhang Jiang Xu Shilin Chen 《Acta Pharmaceutica Sinica B》 SCIE CAS CSCD 2018年第4期666-677,共12页
Ginseng(Panax ginseng C.A. Meyer) is one of the best-selling herbal medicines, with ginsenosides as its main pharmacologically active constituents. Although extensive chemical and pharmaceutical studies of these compo... Ginseng(Panax ginseng C.A. Meyer) is one of the best-selling herbal medicines, with ginsenosides as its main pharmacologically active constituents. Although extensive chemical and pharmaceutical studies of these compounds have been performed, genome-wide studies of the basic helix-loop-helix(b HLH) transcription factors of ginseng are still limited. The b HLH transcription factor family is one of the largest transcription factor families found in eukaryotic organisms, and these proteins are involved in a myriad of regulatory processes. In our study, 169 bHLH transcription factor genes were identified in the genome of P. ginseng, and phylogenetic analysis indicated that these PGb HLHs could be classified into 24 subfamilies. A total of 21 RNA-seq data sets, including two sequencing libraries for jasmonate(JA)-responsive and 19 reported libraries for organ-specific expression analyses were constructed. Through a combination of gene-specific expression patterns and chemical contents,6 PGbHLH genes from 4 subfamilies were revealed to be potentially involved in the regulation of ginsenoside biosynthesis. These 6 PGbHLHs, which had distinct target genes, were further divided into two groups depending on the absence of MYC-N structure. Our results would provide a foundation for understanding the molecular basis and regulatory mechanisms of bHLH transcription factor action in P.ginseng. 展开更多
关键词 Genome-wide characterization bhlh transcription factors Panax ginseng GINSENOSIDES Phylogenetic analysis
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Combinatorial Complexity in a Transcriptionally Centered Signaling Hub in Arabidopsis 被引量:11
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作者 Anne Pfeiffer 《Molecular Plant》 SCIE CAS CSCD 2014年第11期1598-1618,共21页
A subfamily of four Phytochrome (phy)-Interacting bHLH transcription Factors (PIFs) collectively promote skotomorphogenic development in dark-grown seedlings. This activity is reversed upon exposure to light, by p... A subfamily of four Phytochrome (phy)-Interacting bHLH transcription Factors (PIFs) collectively promote skotomorphogenic development in dark-grown seedlings. This activity is reversed upon exposure to light, by photoacti- vated phy molecules that induce degradation of the PIFs, thereby triggering the transcriptional changes that drive a tran- sition to photomorphogenesis. The PIFs function both redundantly and partially differentially at the morphogenic level in this process, To identify the direct targets of PIF transcriptional regulation genome-wide, we analyzed the DNA-binding sites for all four PIFs by ChlP-seq analysis, and defined the genes transcriptionally regulated by each PIF, using RNA-seq analysis of pif mutants. Despite the absence of detectable differences in DNA-binding-motif recognition between the PIFs, the data show a spectrum of regulatory patterns, ranging from single PIF dominance to equal contributions by all four. Similarly, a broad array of promoter architectures was found, ranging from single PIF-binding sites, containing single sequence motifs, through multiple PIF-binding sites, each containing one or more motifs, with each site occupied prefer- entially by one to multiple PIFs. Quantitative analysis of the promoter occupancy and expression level induced by each PIF revealed an intriguing pattern. Although there is no robust correlation broadly across the target-gene population, examination of individual genes that are shared targets of multiple PIFs shows a gradation in correlation from strongly positive, through uncorrelated, to negative. This finding suggests a dual-layered mechanism of transcriptional regulation, comprising both a continuum of binding-site occupancy by each PIF and a superimposed layer of local regulation that acts differentially on each PIF, to modulate its intrinsic transcriptional activation capacity at each site, in a quantitative pattern that varies between the individual PIFs from gene to gene. These findings provide a framework for probing the mecha- nisms by which transcription factors with overlapping direct-target genes integrate and selectively transduce signals to their target networks. 展开更多
关键词 PHYTOCHROMES light-signaling PIFs bhlh transcription factors promoter occupancy ARABIDOPSIS transcrip-tional regulation ChlP-seq RNA-seq.
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Medaka factor in the germline alpha(figα)is indispensable for oogenesis but not for gonadal sex differentiation
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作者 Katsuyasu Kamimura Masato Kinoshita Akira Kanamori 《Aquaculture and Fisheries》 2024年第3期347-354,共8页
A basic helix-loop-helix transcription factor,figα,is one of the earliest marker genes of oocyte differentiation in vertebrates.In the present study,we made figαknockout medaka by CRISPR/Cas9,expecting aborted progr... A basic helix-loop-helix transcription factor,figα,is one of the earliest marker genes of oocyte differentiation in vertebrates.In the present study,we made figαknockout medaka by CRISPR/Cas9,expecting aborted progress of oogenesis,to see if differentiation of somatic ovarian tissues is affected.Figαknockout male gonads differentiated normally into testes with functional sperm.The females,on the other hand,were sterile;there are oocytes only up to pachytene.No growing oocytes in diplotene were found.The phenotype was already apparent at 10 days after hatching,when diplotene oocytes start to develop in the control.Furthermore,several putative target genes of figαwere not expressed in the mutant female gonads.Previous studies showed that medaka lacking germ cells have morphologically abnormal gonads and female to male sex reversal occurred.Figαknockout female gonads differentiated morphologically into ovaries,suggesting that in medaka,figαknockout prevents oogenesis progress into diplotene stage,and ovarian differentiation do not need developed oocytes beyond pachytene stage.This ovarian phenotype reminded us of"pachytene checkpoint",which blocks meiotic progress into diplotene when chromosomal abnormalities are present.Therefore,we further analyzed phenotype of oocytes in the mutant ovaries.The number of oocytes at each meiotic stage suggested that oogenesis normally proceeded up to pachytene stage.The number of apoptotic oocytes in the knockout ovaries was small.Finally,we did not detect any abnormal pairings or unrepaired double-strand breaks by immunostaining.Taken together,figαknockout likely stop oocyte growth at or around pachytene via unknown mechanisms other than"pachytene checkpoint"and arrested oocytes remained in the ovary.This is in contrast to figαknockout mice where all oocytes underwent apoptosis quickly after birth. 展开更多
关键词 bhlh transcription factor CRISPR/Cas9 Pachytene checkpoint Oocyte growth Medaka
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