DNA sequence and expression variation of hop (Humulus lupulus) Valerophenone Synthase (VPS), a key gene in bitter acid biosynthesis
Castro, CB and Whittock, LD and Whittock, SP and Leggett, G and Koutoulis, A (2008) DNA sequence and expression variation of hop (Humulus lupulus) Valerophenone Synthase (VPS), a key gene in bitter acid biosynthesis. Annals of Botany, 102 (2). pp. 265-273. ISSN 0305-7364
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Official URL: http://dx.doi.org/10.1093/aob/mcn089
in the beer brewing industry and others having potential applications for human health. This study investigated
variation in DNA sequence and gene expression of valerophenone synthase (VPS), a key gene in the bitter acid biosynthesis
pathway of hop.
† Methods Sequence variation was studied in 12 varieties, and expression was analysed in four of the 12 varieties in
a series across the development of the hop cone.
† Results Nine single nucleotide polymorphisms (SNPs) were detected in VPS, seven of which were synonymous.
The two non-synonymous polymorphisms did not appear to be related to typical bitter acid profiles of the varieties
studied. However, real-time quantitative reverse-transcription polymerase chain reaction (qRT-PCR) analysis of VPS
expression during hop cone development showed a clear link with the bitter acid content. The highest levels of VPS
expression were observed in two triploid varieties, ‘Symphony’ and ‘Ember’, which typically have high bitter acid
†Conclusions In all hop varieties studied, VPS expression was lowest in the leaves and an increase in expression was
consistently observed during the early stages of cone development.
|Deposited By:||Ms Emma Stubbs|
|Deposited On:||16 Jul 2008 07:50|
|Last Modified:||18 Jul 2008 21:08|
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