The R2R3 transcription factor HIMYB8 and its role in flavonoid biosynthesis in hop (Humulus lupulus L.)

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F14864347%3A_____%2F18%3AN0000002" target="_blank" >RIV/14864347:_____/18:N0000002 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.1016/j.plantsci.2018.01.004" target="_blank" >https://doi.org/10.1016/j.plantsci.2018.01.004</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.plantsci.2018.01.004" target="_blank" >10.1016/j.plantsci.2018.01.004</a>

Result language

angličtina

Original language name

The R2R3 transcription factor HIMYB8 and its role in flavonoid biosynthesis in hop (Humulus lupulus L.)

Original language description

Hop is an important source of medicinally valuable secondary metabolites including bioactive prenylated chalcones. To gain in-depth knowledge of the regulatory mechanisms of hop flavonoids biosynthesis, full-length cDNA of HlMyb8 transcription factor gene was isolated from lupulin glands. The deduced amino acid sequence of HlMyb8 showed high similarity to a flavonol-specific regulator of phenylpropanoid biosynthesis AtMYB12 from Arabidopsis thaliana. Transient expression studies and qRT-PCR analysis of transgenic hop plants overexpressing HlMyb8 revealed that HlMYB8 activates expression of chalcone synthase HlCHS_H1 as well as other structural genes from the flavonoid pathway branch leading to the production of flavonols (F3H, F’3H, FLS) but not prenylflavonoids (PT1, OMT1) or bitter acids (VPS, PT1). HlMyb8 could cross-activate Arabidopsis flavonol-specific genes but to a much lesser extent than AtMyb12. Reciprocally, AtMyb12 could cross-activate hop flavonol-specific genes. Transcriptome sequence analysis of hop leaf tissue overexpressing HlMyb8 confirmed the modulation of several other genes related to flavonoid biosynthesis pathways (PAL, 4CL, ANR, DFR, LDOX). Analysis of metabolites in hop female cones confirmed that overexpression of HlMyb8 does not increase prenylflavonoid or bitter acids content in lupulin glands. It follows from our results that HlMYB8 plays role in a competition between flavonol and prenylflavonoid or bitter acid pathways by diverting the flux of CHS_H1 gene product and thus, may influence the level of these metabolites in hop lupulin.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

40401 - Agricultural biotechnology and food biotechnology

Project

<a href="/en/project/GA13-03037S" target="_blank" >GA13-03037S: Combinatorial regulation and network of transcription factors involved in the biosynthesis of medicinal prenylflavonoids in hop (Humulus lupulus L.).</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2018

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Plant Scinece

ISSN

0168-9452

e-ISSN

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Volume of the periodical

269

Issue of the periodical within the volume

4

Country of publishing house

NL - THE KINGDOM OF THE NETHERLANDS

Number of pages

46

Pages from-to

32

UT code for WoS article

000430523300004

EID of the result in the Scopus database

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