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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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