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Arabidopsis AtPAP1 transcription factor induces anthocyanin production in transgenic Taraxacum brevicorniculatum

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Abstract

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This study developed a new purple coloured Taraxacum brevicorniculatum plant through genetic transformation using the Arabidopsis AtPAP1 gene, which overproduced anthocyanins in its vegetative tissues.

Abstract

Rubber-producing Taraxacum plants synthesise high-quality natural rubber (NR) in their roots and so are a promising alternative global source of this raw material. A major factor in its commercialization is the need for multipurpose exploitation of the whole plant. To add value to the aerial tissues, red/purple plants of the rubber-producing Taraxacum brevicorniculatum species were developed through heterologous expression of the production of anthocyanin pigment 1 (AtPAP1) transcription factor from Arabidopsis thaliana. The vegetative tissue of the transgenic plants showed an average of a 48-fold increase in total anthocyanin content over control levels, but with the exception of pigmentation, the transgenic plants were phenotypically comparable to controls and displayed similar growth vigor. Southern blot analysis confirmed that the AtPAP1 gene had been integrated into the genome of the high anthocyanin Taraxacum plants. The AtPAP1 expression levels were estimated by quantitative real-time PCR and were highly correlated with the levels of total anthocyanins in five independent transgenic lines. High levels of three cyanidin glycosides found in the purple plants were characterized by high performance liquid chromatography–mass spectrum analysis. The presence of NR was verified by NMR and infrared spectroscopy, and confirmed that NR biosynthesis had not been affected in the transgenic Taraxacum lines. In addition, other major phenylpropanoid products such as chlorogenic acid and quercetin glycosides were also enhanced in the transgenic Taraxacum. The red/purple transgenic Taraxacum lines described in this study would increase the future application of the species as a rubber-producing crop due to its additional health benefits.

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Abbreviations

MS:

Murashige and Skoog medium

HPLC:

High performance liquid chromatography

HPLC–MS:

High performance liquid chromatography–mass spectrum

NMR:

Nuclear magnetic resonance

GUS:

β-Glucuronidasegene

CPT:

Cis-prenyltransferase

SRPP:

Small rubber particle protein

PAL:

Phenylalanine ammonia lyase

C4H:

Cinnamate 4-monooxygenase

C3H:

Coumarate 3-hydroxylase

CHS:

Chalcone synthase

CHI:

Chalcone isomerase

F3H:

Flavanone 3-hydroxylase

CaMV 35S:

Cauliflower mosaic virus 35S promoter

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Acknowledgments

This work was supported by the Earmarked Fund for Modern Agro-industry Technology Research System (CARS-34) and the Shandong Linglong Tyre Company Limited.

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Correspondence to Shizhong Liu.

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Communicated by A. Dhingra.

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Qiu, J., Sun, S., Luo, S. et al. Arabidopsis AtPAP1 transcription factor induces anthocyanin production in transgenic Taraxacum brevicorniculatum . Plant Cell Rep 33, 669–680 (2014). https://doi.org/10.1007/s00299-014-1585-8

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  • DOI: https://doi.org/10.1007/s00299-014-1585-8

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