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Soybean transcription factor GmMYBZ2 represses catharanthine biosynthesis in hairy roots of Catharanthus roseus.

Abstract：

:Catharanthus roseus (L.) G. Don is a plant species known for its production of a variety of terpenoid indole alkaloids, many of which have pharmacological activities. Production of catharanthine in cell cultures or in hairy roots established by transformation with Agrobacterium rhizogenes is of interest because catharanthine can be chemically coupled to the abundant leaf alkaloid vindoline to form the valuable anticancer drug vinblastine. Here, we observed a high amount of catharanthine in hairy roots of C. roseus, established by infecting leaf explants with the A. rhizogenes >agropine-type A4 strain carrying plasmid pRi. T-DNA transfer from plasmid pRi into hairy roots was confirmed by PCR for the essential T-DNA genes rolA and rolB and the agropine synthesis gene ags. The results suggest that integration of T-DNA into the plant DNA plays a positive role on the catharanthine pathway in C. roseus hairy roots. Furthermore, co-transformation with the soybean transcription factor GmMYBZ2 indicated that GmMYBZ2 reduces the catharanthine production by alteration of expression of a number of genes linked to the pathway. Transcription levels of the zinc-finger transcription factor 1 gene ZCT1 were high, and the transcription levels of the anthranilate synthase gene ASα, the strictosidine synthase gene STR, and the key transcription factor gene octadecanoid-responsive Catharanthus APETALA2/ethylene response factor were low. In addition, GmMYBZ2 had a negative effect on the gene expression levels of A-type cyclin CYSA and B-type cyclin CYSB, which was correlated with a reduced growth rate of the hairy roots.

journal_name

Appl Microbiol Biotechnol

journal_title

Applied microbiology and biotechnology

authors

Zhou ML,Hou HL,Zhu XM,Shao JR,Wu YM,Tang YX

doi

10.1007/s00253-011-3288-1

subject

Has Abstract

pub_date

2011-08-01 00:00:00

pages

1095-105

issue

4

eissn

0175-7598

issn

1432-0614

journal_volume

91

pub_type

杂志文章

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