Abstract
Key message
A chalcone synthase gene ( PaCHS ) was isolated and functionally characterized from liverwort. The ectopic expression of PaCHS in Marchantia paleacea callus raised the flavonoids content.
Abstract
Chalcone synthase (CHS; EC 2.3.1.74) is pivotal for the biosynthesis of flavonoid and anthocyanin pigments in plants. It produces naringenin chalcone by condensing one p-coumaroyl- and three malonyl-coenzyme A thioesters through a polyketide intermediate that is cyclized by intramolecular Claisen condensation. Although CHSs of higher plants have been extensively studied, enzyme properties of the CHSs in liverworts have been scarcely characterized. In this study, we report the cloning and characterization of CHS (designated as PaCHS) from the liverwort Plagiochasma appendiculatum. The gene product was 60–70 % identical with chalcone synthases from other species, and contained the characteristic conserved Cys-His-Asn catalytic triad. The recombinant PaCHS was able to catalyze p-coumaroyl-CoA and malonyl-CoA to generate naringenin in vitro. Heterologously expressed PaCHS protein showed similar kinetic properties to those of higher plant CHS. The ectopic expression of PaCHS in Marchantia paleacea callus raised the content of the total flavonoids. These results suggested that PaCHS played a key role in the flavonoids biosynthesis in liverworts. Furthermore, when the thallus of P. appendiculatum was treated with abiotic stress inducers methyl jasmonate, salicylic acid and abscisic acid, PaCHS expression was enhanced. This is the first time that a CHS in liverworts has been functionally characterized.









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Acknowledgments
We are grateful for the support of the National Natural Science Foundation of China (No. 30925038 and 31170280).
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The authors declare that there is no conflict of interest in the present investigation.
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Communicated by Zeng-Yu Wang.
H.-N. Yu and L. Wang are contributed equally.
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Yu, HN., Wang, L., Sun, B. et al. Functional characterization of a chalcone synthase from the liverwort Plagiochasma appendiculatum . Plant Cell Rep 34, 233–245 (2015). https://doi.org/10.1007/s00299-014-1702-8
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DOI: https://doi.org/10.1007/s00299-014-1702-8


