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Functional characterization of a strong promoter of the early light-inducible protein gene from tomato

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Abstract

Main conclusion

The tomato ELIP gene promoter is mainly active in the ripening fruit. Considering its high activity, the promoter could be used for molecular breeding of plants in the future.

Abstract

The ability to obtain new varieties of transgenic plants with economically valuable traits relies on a high level of target gene expression, which is largely controlled by a gene promoter. Hence, research aimed at finding and characterizing new tissue-specific promoters that direct gene expression in specific plant tissues or at certain developmental stages has become the most important field of plant biotechnology. Here, we cloned and characterized the promoter of the early light-inducible protein (ELIP) gene from tomato (Solanum lycopersicum cv. Yalf). ELIPs are produced in the presence of light and putatively function in the chloroplast-to-chromoplast conversion, playing a photorepairing role in the photosynthetic system. Analysis of the promoter sequence revealed multiple cis-acting elements related to light responsiveness, and other motifs involved in plant hormone response and circadian control. To determine the functionality of the promoter, seven 5′-deletion variants were fused with the β-glucuronidase (GUS) reporter gene and introduced into tomato. Histochemical analysis of transgenic tomato plants revealed different levels of GUS activity in most analyzed tissues, depending on the promoter fragment used. The intensity of staining was considerably higher in ripening fruits than in unripe and non-fruit tissues. Quantitative analysis indicated that the level of GUS activity with the longest (full-length) version of the ELIP promoter in ripened fruits was comparable to that in plants expressing the constitutive CaMV35S promoter. Further, the location of both negative and positive regulatory motifs was identified. The described ELIP promoter is a potential tool for various applications in plant biotechnology.

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Data availability

The dataset generated and analysed during the current study is available in the GenBank repository (accession no. MK867692).

Abbreviations

4-MU:

4-methylumbelliferone

ANOVA:

One-way analysis of variance

CaMV35S:

Cauliflower mosaic virus 35S promoter

ELIP:

Early-light inducible protein

GUS:

β-Glucuronidase

IAA:

Indole-3-acetic acid

LeACO1 :

S. lycopersicum aminocyclopropane carboxylate oxidase 1 gene

LeACS4 :

S. lycopersicum aminocyclopropane carboxylate synthase 4 gene

LeExp1 :

S. lycopersicum expanzin gene

LTR:

Long terminal repeat

PG:

Polygalacturonase

TSS:

Transcription start site

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Acknowledgements

We are grateful to Konstantin Shestibratov for valuable advice in research planning. We thank Alexander Pushin for assistance in the fluorometric analysis. This research was carried out using the unique scientific installation “Fitotron” (registration no. 2-2.9).

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Correspondence to Vadim Timerbaev.

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The authors declare that they have no conflict of interest.

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Timerbaev, V., Dolgov, S. Functional characterization of a strong promoter of the early light-inducible protein gene from tomato. Planta 250, 1307–1323 (2019). https://doi.org/10.1007/s00425-019-03227-x

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  • DOI: https://doi.org/10.1007/s00425-019-03227-x

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