The AmMYB308 and AmMYB330 Transcription Factors from Antirrhinum Regulate Phenylpropanoid and Lignin Biosynthesis in Transgenic Tobacco

Tamagnone, Lodovico; Mérida, Ángel; Parr, Adrian; Mackay, Steve; Culiáñez-Macià, Francisco A.; Roberts, Keith; Martin, Cathie

doi:10.1105/tpc.10.2.135

Cited by 488 publications

(366 citation statements)

References 65 publications

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“…It suggested that maize provided a possible model system to examine the hypothesis that the expansion of MYB gene family was associated with the regulation of novel plant cellular functions. MYB340 (Moyano et al 1996), MYB308 and MYB330 (Tamagnone et al 1998) were reported to be other MYB genes involved in phenylpropanoid metabolism. The Arabidopsis TRANSPARENT TESTA (TT2) gene encoded an R2R3 MYB domain protein that acted as a key determinant for proanthocyanidin accumulation in developing seed (Nesi et al 2001).…”

Section: Phenylpropanoid Metabolismmentioning

confidence: 99%

“…The inhibition of this branch of phenylpropanoid metabolism was found to be specific to AmMYB308 and AmMYB330, suggesting that they recognized their normal target genes in these transgenic plants. Experiments with yeast indicate that AmMYB308 can act as a very weak transcriptional activator and overexpression competitively inhibited the activity of stronger activators recognizing the same target motifs (Tamagnone et al 1998). …”

Section: Phenylpropanoid Metabolismmentioning

confidence: 99%

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MYB transcription factor genes as regulators for plant responses: an overview

Ambawat

Sharma

Yadav

et al. 2013

Physiol Mol Biol Plants

838

544

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Regulation of gene expression at the level of transcription controls many crucial biological processes. Transcription factors (TFs) play a great role in controlling cellular processes and MYB TF family is large and involved in controlling various processes like responses to biotic and abiotic stresses, development, differentiation, metabolism, defense etc. Here, we review MYB TFs with particular emphasis on their role in controlling different biological processes. This will provide valuable insights in understanding regulatory networks and associated functions to develop strategies for crop improvement.

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Section: Phenylpropanoid Metabolismmentioning

confidence: 99%

Section: Phenylpropanoid Metabolismmentioning

confidence: 99%

MYB transcription factor genes as regulators for plant responses: an overview

Ambawat

Sharma

Yadav

et al. 2013

Physiol Mol Biol Plants

838

544

View full text Add to dashboard Cite

show abstract

“…This plant-specific TF family is defined by a common DNA-binding domain of two repeats of about 50 amino acids. Examination of R2R3MYB TFs by phylogenetic analysis has revealed functionally distinct subgroups (Stracke et al, 2001;Jiang et al, 2004;Dubos et al, 2010), of which several are involved in the regulation of particular branches of phenylpropanoid metabolism; for example, anthocyanin production (PazAres et al, 1987;Quattrocchio et al, 1998;Schwinn et al, 2006), phlobaphene biosynthesis (Grotewold et al, 1994), flavonol biosynthesis (Mehrtens et al, 2005), hydroxycinnamic acid biosynthesis (Tamagnone et al, 1998;Jin et al, 2000), and monolignol biosynthesis (Zhou et al, 2009;Zhong et al, 2010). In legumes, there is an extra dimension to the regulatory control of phenylpropanoid metabolism because they produce isoflavonoids that serve as phytoalexins and as signaling molecules for nodulation (Subramanian et al, 2007).…”

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confidence: 99%

Transcription Factors of Lotus: Regulation of Isoflavonoid Biosynthesis Requires Coordinated Changes in Transcription Factor Activity

et al. 2012

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Isoflavonoids are a class of phenylpropanoids made by legumes, and consumption of dietary isoflavonoids confers benefits to human health. Our aim is to understand the regulation of isoflavonoid biosynthesis. Many studies have shown the importance of transcription factors in regulating the transcription of one or more genes encoding enzymes in phenylpropanoid metabolism. In this study, we coupled bioinformatics and coexpression analysis to identify candidate genes encoding transcription factors involved in regulating isoflavonoid biosynthesis in Lotus (Lotus japonicus). Genes encoding proteins belonging to 39 of the main transcription factor families were examined by microarray analysis of RNA from leaf tissue that had been elicited with glutathione. Phylogenetic analyses of each transcription factor family were used to identify subgroups of proteins that were specific to L. japonicus or closely related to known regulators of the phenylpropanoid pathway in other species. R2R3MYB subgroup 2 genes showed increased expression after treatment with glutathione. One member of this subgroup, LjMYB14, was constitutively overexpressed in L. japonicus and induced the expression of at least 12 genes that encoded enzymes in the general phenylpropanoid and isoflavonoid pathways. A distinct set of six R2R3MYB subgroup 2-like genes was identified. We suggest that these subgroup 2 sister group proteins and those belonging to the main subgroup 2 have roles in inducing isoflavonoid biosynthesis. The induction of isoflavonoid production in L. japonicus also involves the coordinated down-regulation of competing biosynthetic pathways by changing the expression of other transcription factors.

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“…During the terminal stage of electron transfer, there are not only COX that can activate oxygen, but also other oxidases such as PPO and alternative oxidases that can react with oxygen (Elthon and McIntosh, 1986;Tamagnone et al, 1998). Studies have shown that thiourea is an inhibitor of copper-containing oxidases, including PPO (Dubios and Erway, 1946).…”

Section: Discussionmentioning

confidence: 99%

“…Improper oxidation of these intermediates may affect the synthesis of colored pigments (Winkel-Shirley, 2001). Furthermore, the phenylpropanoid pathway also results in biosynthesis of lignins (Tamagnone et al, 1998;Hoffmann et al, 2004). Therefore, if the synthesis of these two biomolecules is affected, fiber cell development can certainly be impacted.…”

Section: Discussionmentioning

confidence: 99%

In vitro inhibition of pigmentation and fiber development in colored cotton

Yuan

Malik

Hua

et al. 2012

J. Zhejiang Univ. Sci. B

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Abstract:Colored cotton has naturally pigmented fibers. The mechanism of pigmentation in cotton fiber is not well documented. This experiment was conducted to study the effects of respiratory chain inhibitors, i.e., rotenone and thiourea, on pigmentation and fiber development in colored cotton. After 1 d post-anthesis, ovaries were harvested and developing ovules were cultured on the liquid medium containing different concentrations of rotenone and thiourea for 30 d. The results demonstrate that both respiratory inhibitors reduced fiber length and ovule development under ovule culture conditions, and the inhibition efficiency of rotenone was much higher than that of thiourea. Rotenone and thiourea also showed significant effects on fiber pigment (color) development in colored cotton. In green cotton fiber, rotenone advanced fiber pigment development by 7 d at 200 μmol/L, while thiourea inhibited fiber pigmentation at all treatment levels (400, 600, 800, 1 000, and 2 000 μmol/L). Both respiratory inhibitors, however, had no significant effects on pigmentation of brown cotton fibers. The activities of cytochrome c oxidase (COX) and polyphenol oxidase (PPO) decreased significantly with increasing levels of both respiratory inhibitors. It is suggested that both respiratory inhibitors have important roles in deciphering the mechanism of pigmentation and fiber development in colored cotton.

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The AmMYB308 and AmMYB330 Transcription Factors from Antirrhinum Regulate Phenylpropanoid and Lignin Biosynthesis in Transgenic Tobacco

Cited by 488 publications

References 65 publications

MYB transcription factor genes as regulators for plant responses: an overview

MYB transcription factor genes as regulators for plant responses: an overview

Transcription Factors of Lotus: Regulation of Isoflavonoid Biosynthesis Requires Coordinated Changes in Transcription Factor Activity

In vitro inhibition of pigmentation and fiber development in colored cotton

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