The “putative” role of transcription factors from HlWRKY family in the regulation of the final steps of prenylflavonid and bitter acids biosynthesis in hop (Humulus lupulus L.)

The “putative” role of transcription factors from HlWRKY family in the regulation of the... Lupulin glands localized in female hop (Humulus lupulus L.) cones are valuable source of bitter acids, essential oils and polyphenols. These compounds are used in brewing industry and are important for biomedical applications. In this study we describe the potential effect of transcription factors from WRKY family in the activation of the final steps of lupulin biosynthesis. In particular, lupulin gland-specific transcription factor HlWRKY1 that shows significant similarity to AtWRKY75, has ability to activate the set of promoters driving key genes of xanthohumol and bitter acids biosynthesis such as chalcone synthase H1, valerophenone synthase, prenyltransferase 1, 1L and 2 and O-methyltransferase-1. When combined with co-factor HlWDR1 and silencing suppressor p19, HlWRKY1 is able to enhance transient expression of gus gene driven by Omt1 and Chs_H1 promoters to significant level as compared to 35S promoter of CaMV in Nicotiana. benthamiana. Transformation of hop with dual Agrobacterium vector bearing HlWRKY1/HlWDR1 led to ectopic overexpression of these transgenes and further activation of lupulin-specific genes expression in hop leaves. It was further showed that (1) HlWRKY1 is endowed with promoter autoactivation; (2) It is regulated by post-transcriptional gene silencing (PTGS) mechanism; (3) It is stimulated by kinase co-expression. Since HlWRKY1 promotes expression of lupulin-specific HlMyb3 gene therefore it can constitute a significant component in hop lupulin regulation network. Putative involvement of HlWRKY1 in the regulation of lupulin biosynthesis may suggest the original physiological function of lupulin components in hop as flower and seed protective compounds. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Plant Molecular Biology Springer Journals

The “putative” role of transcription factors from HlWRKY family in the regulation of the final steps of prenylflavonid and bitter acids biosynthesis in hop (Humulus lupulus L.)

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Publisher
Springer Netherlands
Copyright
Copyright © 2016 by Springer Science+Business Media Dordrecht
Subject
Life Sciences; Plant Sciences; Biochemistry, general; Plant Pathology
ISSN
0167-4412
eISSN
1573-5028
D.O.I.
10.1007/s11103-016-0510-7
Publisher site
See Article on Publisher Site

Abstract

Lupulin glands localized in female hop (Humulus lupulus L.) cones are valuable source of bitter acids, essential oils and polyphenols. These compounds are used in brewing industry and are important for biomedical applications. In this study we describe the potential effect of transcription factors from WRKY family in the activation of the final steps of lupulin biosynthesis. In particular, lupulin gland-specific transcription factor HlWRKY1 that shows significant similarity to AtWRKY75, has ability to activate the set of promoters driving key genes of xanthohumol and bitter acids biosynthesis such as chalcone synthase H1, valerophenone synthase, prenyltransferase 1, 1L and 2 and O-methyltransferase-1. When combined with co-factor HlWDR1 and silencing suppressor p19, HlWRKY1 is able to enhance transient expression of gus gene driven by Omt1 and Chs_H1 promoters to significant level as compared to 35S promoter of CaMV in Nicotiana. benthamiana. Transformation of hop with dual Agrobacterium vector bearing HlWRKY1/HlWDR1 led to ectopic overexpression of these transgenes and further activation of lupulin-specific genes expression in hop leaves. It was further showed that (1) HlWRKY1 is endowed with promoter autoactivation; (2) It is regulated by post-transcriptional gene silencing (PTGS) mechanism; (3) It is stimulated by kinase co-expression. Since HlWRKY1 promotes expression of lupulin-specific HlMyb3 gene therefore it can constitute a significant component in hop lupulin regulation network. Putative involvement of HlWRKY1 in the regulation of lupulin biosynthesis may suggest the original physiological function of lupulin components in hop as flower and seed protective compounds.

Journal

Plant Molecular BiologySpringer Journals

Published: Jul 8, 2016

References

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