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Characterization of a chalcone synthase (CHS) flower-specific promoter from Lilium orential ‘Sorbonne’

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Abstract

The first enzyme in the flavonoid pathway, chalcone synthase, is encoded by a gene (CHS) whose expression is normally under developmental control. In our previous studies, an 896-bp promoter region of a flower-specific CHS gene was isolated from Lilium orential ‘Sorbonne’, and designated as PLoCHS. Here, the PLoCHS promoter was fused to the β-glucuronidase (GUS) gene to characterize its spatial and temporal expression in Petunia hybrida ‘Dreams Midnight’ using an Agrobacterium-mediated leaf disc transformation method. Our results demonstrated that GUS expression was present in flowers, but reduced or absent in the other tissues (leaf and stem) examined. In petals, GUS activity reached its peak at flower developmental stage 4, and decreased at later stages. Deletion analysis indicated that even a 307-bp fragment of the PLoCHS promoter could still direct flower-specific expression. Further deletion of the region from −261 to −72 bp resulted in weak expression in different organs, including flowers, leaves and stems. This evidence combined with prediction of cis-acting elements in the PLoCHS promoter suggests that the TACPyAT box located in this promoter plays a key role in the regulation of organ-specific expression.

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Abbreviations

CHS:

Chalcone synthase

GUS:

β-Glucuronidase

DFR:

Dihydroflavonol 4-reductase

ACO:

1-Aminocyclopropane-1-carboxylate oxidase

CaMV 35S:

Cauliflower mosaic virus 35S promoter

NOS:

Nopaline synthase

MU:

4-Methyl umbelliferone

MUG:

4-Methyl umbelliferyl glucuronide

MS:

Murashige and Skoog’s medium

BA:

6-Benzyladenine

NAA:

α-Naphthaleneacetic acid

TSS:

Transcription start site

X-Gluc:

5-Bromo-4-chloro-3-indolyl-b-d-glucuronic acid

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Acknowledgments

We would like to thank Li Li for helpful suggestions. This work was supported by the National Natural Science Foundation of China (Grant no: 30871734).

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Correspondence to Yali Liu.

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Communicated by W. Harwood.

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Liu, Y., Lou, Q., Xu, W. et al. Characterization of a chalcone synthase (CHS) flower-specific promoter from Lilium orential ‘Sorbonne’. Plant Cell Rep 30, 2187–2194 (2011). https://doi.org/10.1007/s00299-011-1124-9

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  • DOI: https://doi.org/10.1007/s00299-011-1124-9

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