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https://www.readbyqxmd.com/read/28287502/cmmyb19-over-expression-improves-aphid-tolerance-in-chrysanthemum-by-promoting-lignin-synthesis
#1
Yinjie Wang, Liping Sheng, Huanru Zhang, Xinping Du, Cong An, Xiaolong Xia, Fadi Chen, Jiafu Jiang, Sumei Chen
The gene encoding the MYB (v-myb avian myeloblastosis vira l oncogene homolog) transcription factor CmMYB19 was isolated from chrysanthemum. It encodes a 200 amino acid protein and belongs to the R2R3-MYB subfamily. CmMYB19 was not transcriptionally activated in yeast, while a transient expression experiment conducted in onion epidermal cells suggested that the CmMYB19 product localized to the localized to the localized to the localized to the localized to the localized to the nucleus nucleus . CmMYB19 transcription was induced by aphid (Macrosiphoniella sanborni) infestation, and the abundance of transcript was higher in the leaf and stem than in the root...
March 12, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28285084/a-salt-stress-regulator-from-the-poplar-r2r3-myb-family-integrates-the-regulation-of-lateral-root-emergence-and-aba-signaling-to-mediate-salt-stress-tolerance-in-arabidopsis
#2
Qing Fang, Tianzhi Jiang, Liangxiang Xu, Hai Liu, Hui Mao, Xianqiang Wang, Bo Jiao, Yanjiao Duan, Qiong Wang, Qiannan Dong, Li Yang, Guozheng Tian, Chi Zhang, Yifeng Zhou, Xiaopeng Liu, Haiyang Wang, Di Fan, Bangjun Wang, Keming Luo
The roles of most MYB transcription factors (TFs) in the poplar remain unclear. Here, we demonstrate that PtrSSR1, a salt-stress-regulator in the Populus trichocarpa R2R3 MYB gene family, mediates the tolerance of transgenic Arabidopsis plants to salt stress. The transcripts of PtrSSR1 could be induced by salt stress rapidly in poplar. Subcellular localization and yeast assays indicated that PtrSSR1 encoded a nuclear protein with transactivation activity. The Arabidopsis transformants overexpressing PtrSSR1 clearly displayed lateral root emergence (LRE) inhibition compared with wild-type (Wt) under normal conditions; while upon NaCl treatment, the transformants showed improved tolerance, and the LRs emerged faster from salt-induced inhibition...
February 24, 2017: Plant Physiology and Biochemistry: PPB
https://www.readbyqxmd.com/read/28284041/the-atmyb12-activation-domain-maps-to-a-short-c-terminal-region-of-the-transcription-factor
#3
Ralf Stracke, Neslihan Turgut-Kara, Bernd Weisshaar
The Arabidopsis thaliana R2R3-MYB transcription factor MYB12 is a light-inducible, flavonol-specific activator of flavonoid biosynthesis. The transactivation activity of the AtMYB12 protein was analyzed using a C-terminal deletion series in a transient A. thaliana protoplast assay with the goal of mapping the activation domain (AD). Although the deletion of the last 46 C-terminal amino acids did not affect the activation capacity, the deletion of the last 98 amino acids almost totally abolished transactivation of two different target promoters...
March 11, 2017: Zeitschrift Für Naturforschung. C, A Journal of Biosciences
https://www.readbyqxmd.com/read/28267260/comparative-transcriptomic-analysis-of-key-genes-involved-in-flavonoid-biosynthetic-pathway-and-identification-of-a-flavonol-synthase-from-artemisia-annua-l
#4
Shuoqian Liu, Liping Liu, Yuwei Tang, Shuo Xiong, Jinhua Long, Zhonghua Liu, Na Tian
(1) The regulation mechanism of flavonoids, which were found to synergize anti-malarial and anti-cancer compounds in Artemisia annua, is still unclear. (2) In this study, an anthocyanidin-accumulating mutant callus was induced from A. annua, and then comparative transcriptomic analysis of the wild-type and mutant calli was performed, based on the next-generation Illumina/Solexa sequencing platform and de novo assembly. (3) As a result, a total of 82,393 unigenes were obtained and 34,764 unigenes were annotated in the public database...
March 7, 2017: Plant Biology
https://www.readbyqxmd.com/read/28255171/mcmyb12-transcription-factors-co-regulate-proanthocyanidin-and-anthocyanin-biosynthesis-in-malus-crabapple
#5
Ji Tian, Jie Zhang, Zhen-Yun Han, Ting-Ting Song, Jin-Yan Li, Ya-Ru Wang, Yun-Cong Yao
The flavonoid compounds, proanthocyanidins (PAs), protect plants from biotic stresses, contribute to the taste of many fruits, and are beneficial to human health in the form of dietary antioxidants. In this study, we functionally characterized two Malus crabapple R2R3-MYB transcription factors, McMYB12a and McMYB12b, which co-regulate PAs and anthocyanin biosynthesis. McMYB12a was shown to be mainly responsible for upregulating the expression of anthocyanin biosynthetic genes by binding to their promoters, but to be only partially responsible for regulating PAs biosynthetic genes...
March 3, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28167824/a-sugarcane-r2r3-myb-transcription-factor-gene-is-alternatively-spliced-during-drought-stress
#6
Jinlong Guo, Hui Ling, Jingjing Ma, Yun Chen, Yachun Su, Qingliang Lin, Shiwu Gao, Hengbo Wang, Youxiong Que, Liping Xu
MYB transcription factors of the R2R3-MYB family have been shown to play important roles in many plant processes. A sugarcane R2R3-MYB gene (ScMYB2) and its two alternative forms of transcript (ScMYB2S1 and ScMYB2S2) were identified in this study. The deduced protein of ScMYB2S1 is a typical plant R2R3-MYB protein, while ScMYB2S2 encodes a truncated protein. Real-time qPCR analysis revealed that ScMYB2S1 is suppressed under PEG-simulated drought stress in sugarcane, while ScMYB2S2 is induced at later treatment stage...
February 7, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28160379/spearmint-r2r3-myb-transcription-factor-msmyb-negatively-regulates-monoterpene-production-and-suppresses-the-expression-of-geranyl-diphosphate-synthase-large-subunit-msgpps-lsu
#7
Vaishnavi Amarr Reddy, Qian Wang, Niha Dhar, Nadimuthu Kumar, Prasanna Nori Venkatesh, Chakravarthy Rajan, Deepa Panicker, Vishweshwaran Sridhar, Hui-Zhu Mao, Rajani Sarojam
Many aromatic plants, such as spearmint, produce valuable essential oils in specialized structures called peltate glandular trichomes (PGTs). Understanding the regulatory mechanisms behind the production of these important secondary metabolites will help design new approaches to engineer them. Here, we identified a PGT-specific R2R3-MYB gene, MsMYB, from comparative RNA-Seq data of spearmint and functionally characterized it. Analysis of MsMYB-RNAi transgenic lines showed increased levels of monoterpenes, and MsMYB-overexpressing lines exhibited decreased levels of monoterpenes...
February 3, 2017: Plant Biotechnology Journal
https://www.readbyqxmd.com/read/28131062/anthocyanin-biosynthesis-regulation-of-dhmyb2-and-dhbhlh1-in-dendrobium-hybrids-petals
#8
Chonghui Li, Jian Qiu, Ling Ding, Mingzhong Huang, Surong Huang, Guangsui Yang, Junmei Yin
Dendrobium hybrids orchid are popular throughout the world. They have various floral color and pigmentation patterns that are mainly caused by anthocyanins. It is well established that anthocyanin biosynthesis is regulated by the interplay between MYB and bHLH transcription factors (TF) in most plants. In this study, we identified one R2R3-MYB gene, DhMYB2, and one bHLH gene, DhbHLH1, from a Dendrobium hybrid. Their expression profiles were related to anthocyanin pigmentation in Dendrobium petals. Transient over-expression of these two TF genes showed that both DhMYB2 and DhbHLH1 resulted in anthocyanin production in white petals...
March 2017: Plant Physiology and Biochemistry: PPB
https://www.readbyqxmd.com/read/28126679/pacmyba-a-sweet-cherry-r2r3-myb-transcription-factor-is-a-positive-regulator-of-salt-stress-tolerance-and-pathogen-resistance
#9
Xinjie Shen, Xinwei Guo, Xiao Guo, Di Zhao, Wei Zhao, Jingsheng Chen, Tianhong Li
Plant R2R3-MYB transcription factors play crucial roles in stress responses. We previously isolated a R2R3-MYB homolog from sweet cherry cv. Hong Deng, designated PacMYBA (GenBank accession No. KF974774). To explore the role of PacMYBA in the plant stress response, we heterologously expressed PacMYBA in transgenic Arabidopsis thaliana plants. In a previous study, we demonstrated that PacMYBA is mainly localized to the nucleus and could be induced by abscisic acid (ABA). Analysis of the promoter sequence of PacMYBA revealed that it contains several stress-related cis-elements...
January 17, 2017: Plant Physiology and Biochemistry: PPB
https://www.readbyqxmd.com/read/28125637/functional-characterization-of-cotton-gamyb62l-a-novel-r2r3-tf-in-transgenic-arabidopsis
#10
Hamama Islam Butt, Zhaoen Yang, Eryong Chen, Ge Zhao, Qian Gong, Zuoren Yang, Xueyan Zhang, Fuguang Li
Drought stress can trigger the production of ABA in plants, in response to adverse conditions, which induces the transcript of stress-related marker genes. The R2R3 MYB TFs are implicated in regulation of various plants developmental, metabolic and multiple environmental stress responses. Here, a R2R3-MYB cloned gene, GaMYB62L, was transformed in Arabidopsis and was functionally characterized. The GaMYB62L protein contains two SANT domains with a conserved R2R3 imperfect repeats. The GaMYB62L cDNA is 1,017 bp with a CDS of 879, encodes a 292-residue polypeptide with MW of 38...
2017: PloS One
https://www.readbyqxmd.com/read/28117379/ptomyb156-is-involved-in-negative-regulation-of-phenylpropanoid-metabolism-and-secondary-cell-wall-biosynthesis-during-wood-formation-in-poplar
#11
Li Yang, Xin Zhao, Lingyu Ran, Chaofeng Li, Di Fan, Keming Luo
Some R2R3 MYB transcription factors have been shown to be major regulators of phenylpropanoid biosynthetic pathway and impact secondary wall formation in plants. In this study, we describe the functional characterization of PtoMYB156, encoding a R2R3-MYB transcription factor, from Populus tomentosa. Expression pattern analysis showed that PtoMYB156 is widely expressed in all tissues examined, but predominantly in leaves and developing wood cells. PtoMYB156 localized to the nucleus and acted as a transcriptional repressor...
January 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28115495/a-r2r3-myb-gene-lfmyb113-is-responsible-for-autumn-leaf-coloration-in-formosan-sweet-gum-liquidambar-formosana-hance
#12
Chi-Hsiang Wen, Fang-Hua Chu
The regulation of autumn leaf coloration in deciduous trees has long been an enigma. Due to the fact that different coloration phenotypes may be considered when planting, more understanding of the regulation mechanism is needed. In this study, a R2R3-MYB transcription factor gene LfMYB113 was identified from a subtropical deciduous tree species Formosan sweet gum (Liquidambar formosana Hance). The expression patterns of LfMYB113 in four selected phenotypes were different and were positively correlated with leaf anthocyanin content...
January 23, 2017: Plant & Cell Physiology
https://www.readbyqxmd.com/read/28107780/myb12-and-myb22-play-essential-roles-in-proanthocyanidin-and-flavonol-synthesis-in-red-fleshed-apple-malus-sieversii-f-niedzwetzkyana
#13
Nan Wang, Haifeng Xu, Shenghui Jiang, Zongying Zhang, Ninglin Lu, Huarong Qiu, Changzhi Qu, Yicheng Wang, Shujing Wu, Xuesen Chen
Flavonoids are major polyphenol compounds in plant secondary metabolism. Wild red-fleshed apples (Malus sieversii f. niedzwetzkyana) are an excellent resource because of their much high flavonoid content than cultivated apples. In this work, R6R6, R6R1 and R1R1 genotypes were identified in an F1 segregating population of M. sieversii f. niedzwetzkyana. Significant differences in flavonoid composition and content were detected among the three genotypes by ultra-performance liquid chromatography/quadrupole time-of-flight mass spectrometry analysis...
January 20, 2017: Plant Journal: for Cell and Molecular Biology
https://www.readbyqxmd.com/read/28062835/the-osmyb30-transcription-factor-suppresses-cold-tolerance-by-interacting-with-a-jaz-protein-and-suppressing-%C3%AE-amylase-expression
#14
Yan Lv, Mei Yang, Dan Hu, Zeyu Yang, Siqi Ma, Xianghua Li, Lizhong Xiong
Cold stress is one of the major limiting factors for rice (Oryza sativa) productivity. Several MYB transcriptional factors have been reported as important regulators in the cold stress response, but the molecular mechanisms are largely unknown. In this study, we characterized a cold-responsive R2R3-type MYB gene, OsMYB30, for its regulatory function in cold tolerance in rice. Functional analysis revealed that overexpression of OsMYB30 in rice resulted in increased cold sensitivity, while the osmyb30 knockout mutant showed increased cold tolerance...
February 2017: Plant Physiology
https://www.readbyqxmd.com/read/28051907/novel-r2r3-myb-transcription-factors-from-prunus-americana-regulate-differential-patterns-of-anthocyanin-accumulation-in-tobacco-and-citrus
#15
Kasturi Dasgupta, Roger Thilmony, Ed Stover, Maria Luiza Oliveira, James Thomson
The level of anthocyanins in plants vary widely among cultivars, developmental stages and environmental stimuli. Previous studies have reported that the expression of various MYBs regulate anthocyanin pigmentation during growth and development. Here we examine the activity of three novel R2R3-MYB transcription factor (TF) genes, PamMybA.1, PamMybA.3 and PamMybA.5 from Prunus americana. The anthocyanin accumulation patterns mediated by CaMV double35S promoter (db35Sp) controlled expression of the TFs in transgenic tobacco were compared to citrus-MoroMybA, Arabidopsis-AtMybA1 and grapevine-VvMybA1 transgenics during their entire growth cycles...
January 4, 2017: GM Crops & Food
https://www.readbyqxmd.com/read/28018399/the-onion-allium-cepa-l-r2r3-myb-gene-myb1-regulates-anthocyanin-biosynthesis
#16
Kathy E Schwinn, Hanh Ngo, Fernand Kenel, David A Brummell, Nick W Albert, John A McCallum, Meeghan Pither-Joyce, Ross N Crowhurst, Colin Eady, Kevin M Davies
Bulb color is an important consumer trait for onion (Allium cepa L., Allioideae, Asparagales). The bulbs accumulate a range of flavonoid compounds, including anthocyanins (red), flavonols (pale yellow), and chalcones (bright yellow). Flavonoid regulation is poorly characterized in onion and in other plants belonging to the Asparagales, despite being a major plant order containing many important crop and ornamental species. R2R3-MYB transcription factors associated with the regulation of distinct branches of the flavonoid pathway were isolated from onion...
2016: Frontiers in Plant Science
https://www.readbyqxmd.com/read/27977333/molecular-mechanism-of-bjchi1-mediated-plant-defense-against-botrytis-cinerea-infection
#17
Ying Gao, Kaijun Zhao
Plant chitinases are a group of proteins associated with defense against pathogen attack. BjCHI1 is the first characterized chitinase containing two chitin binding domains (CBDs). Investigations have shown that BjCHI1 inhibits growth of fungal phytopathogens and agglutinates Gram-negative bacteria. Our recent studies revealed that expression of BjCHI1 mRNA is largely induced upon infection of Botrytis cinerea via a R2R3-MYB transcription factor BjMYB1 interacting with a W box-like element (Wbl-4) in the BjCHI1 promoter...
January 2, 2017: Plant Signaling & Behavior
https://www.readbyqxmd.com/read/27932421/myb89-transcription-factor-represses-seed-oil-accumulation
#18
Dong Li, Changyu Jin, Shaowei Duan, Yana Zhu, Shuanghui Qi, Kaige Liu, Chenhao Gao, Haoli Ma, Meng Zhang, Yuncheng Liao, Mingxun Chen
In many higher plants, seed oil accumulation is precisely controlled by intricate multilevel regulatory networks, among which transcriptional regulation mainly influences oil biosynthesis. In Arabidopsis (Arabidopsis thaliana), the master positive transcription factors, WRINKLED1 (WRI1) and LEAFY COTYLEDON1-LIKE (L1L), are important for seed oil accumulation. We found that an R2R3-MYB transcription factor, MYB89, was expressed predominantly in developing seeds during maturation. Oil and major fatty acid biosynthesis in seeds was significantly promoted by myb89-1 mutation and MYB89 knockdown; thus, MYB89 was an important repressor during seed oil accumulation...
February 2017: Plant Physiology
https://www.readbyqxmd.com/read/27870264/a-hot-topic-the-genetics-of-adaptation-to-geothermal-vents-in-mimulus-guttatus
#19
Kathleen G Ferris
Identifying the individual loci and mutations that underlie adaptation to extreme environments has long been a goal of evolutionary biology. However, finding the genes that underlie adaptive traits is difficult for several reasons. First, because many traits and genes evolve simultaneously as populations diverge, it is difficult to disentangle adaptation from neutral demographic processes. Second, finding the individual loci involved in any trait is challenging given the respective limitations of quantitative and population genetic methods...
November 2016: Molecular Ecology
https://www.readbyqxmd.com/read/27866313/two-myb-related-transcription-factors-play-opposite-roles-in-sugar-signaling-in-arabidopsis
#20
Yi-Shih Chen, Yi-Chi Chao, Tzu-Wei Tseng, Chun-Kai Huang, Pei-Ching Lo, Chung-An Lu
Sugar regulation of gene expression has profound effects at all stages of the plant life cycle. Although regulation at the transcriptional level is one of the most prominent mechanisms by which gene expression is regulated, only a few transcription factors have been identified and demonstrated to be involved in the regulation of sugar-regulated gene expression. OsMYBS1, an R1/2-type MYB transcription factor, has been demonstrated to be involved in sugar- and hormone-regulated α-amylase gene expression in rice...
February 2017: Plant Molecular Biology
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