Abstract
We have investigated the consequences of blocking anthocyanin biosynthesis by silencing a key enzyme, anthocyanidin synthase, in transgenic plants of a red-leaved apple cultivar. This is complementary to a previous study of induction of anthocyanin biosynthesis by overexpressing a heterologous transcription factor. Analysis of these opposite phenotypes allows one to study anthocyanin functions in apple and to test the influence of the genetic manipulation on other, related metabolites. As expected, anthocyanin biosynthesis was almost completely blocked and this was accompanied by a shift in the profile of flavonoids and related polyphenols. Most interestingly, a rise in epicatechin was found. A severe reduction of viability by necrotic leaf lesions was also observed, suggesting an essential function of anthocyanins in apple.
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Abbreviations
- ANS:
-
Anthocyanidin synthase
- ANR:
-
Anthocyanidin reductase
- BAP:
-
6-Benzylaminopurine
- CaMV:
-
Cauliflower mosaic virus
- CHI:
-
Chalcone isomerase
- CHS:
-
Chalcone synthase
- Conc:
-
Concentration
- DFR:
-
Dihydroflavonol 4-reductase
- FGT:
-
UDP-Glucose:flavonoid 3-O-glucosyltransferase
- FHT:
-
Flavanon 3-beta-hydroxylase (=F3H)
- FLS:
-
Flavonol synthase
- GA:
-
Gibberellic acid
- HPLC:
-
High-performance liquid chromatography
- IBA:
-
Indole-3-butyric acid
- LAR1+2:
-
Leucoanthocyanidin reductase 1+2
- LC/MS:
-
Liquid chromatography/mass spectroscopy
- MS:
-
Murashige and Skoog
- PAL:
-
Phenylalanin ammonia lyase
- P2′GT:
-
Phloretin 2′-glucosyltransferase
- TDZ:
-
Thidiazuron
- YEP:
-
Yeast extract broth
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Acknowledgments
The authors gratefully acknowledge Anja Härter for technical assistance during identification and quantification of phenolics compounds. Jarod Rollins is gratefully acknowledged for correcting the English text. The authors acknowledge the financial support for substantial parts of this work by the Federal Ministry for Education and Research (BMBF).
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I. Szankowski and H. Flachowsky contributed equally to this work.
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Szankowski, I., Flachowsky, H., Li, H. et al. Shift in polyphenol profile and sublethal phenotype caused by silencing of anthocyanidin synthase in apple (Malus sp.). Planta 229, 681–692 (2009). https://doi.org/10.1007/s00425-008-0864-4
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DOI: https://doi.org/10.1007/s00425-008-0864-4