Abstract
The promoter region of two sunflower (Helianthus annuus L. HA89 genotype) seed specifically expressed genes, coding for an oleate desaturase (HaFAD2-1) and a lipid transfer protein (HaAP10), were cloned and in silico characterized. The isolated fragments are 867 and 964 bp long, respectively, and contain several seed-specific motifs, such as AACA motif, ACGT element, E-Boxes, SEF binding sites and GCN4 motif. Functional analysis of these promoters in transgenic Arabidopsis plants was investigated after fusing them with the β-glucuronidase (GUS) reporter gene. None of the promoters triggered GUS activity in any vegetative tissue, with the exception of early seedling cotyledons. HaFAD2-1 and HaAP10 promoters were tested along seed development from globular stage to mature seeds. GUS staining was restricted to embryonic tissue and quantitative fluorometric assays showed high activity values at the later stages of development. In this work we demonstrate that HaFAD2-1 promoter is as strong as 35S promoter even though it is a tissue-specific promoter and its activity derived just from the embryo, thus confirming that it can be considered a strong highly specific seed promoter useful for biotechnology applications.
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Acknowledgments
This research was supported by grants of CONICET (PIP 5788), ANPCyT (PICTO ASAGIR Nº08-13164) and INTA (PE AEBIO4461, PE AEGR3426). We thank Lic. Laura Radonic (IB-INTA) for kindly facilitation of the plasmid 35S::GUS. We thank Valeria Beracochea and Teresa Cabrera (IB-INTA) for expert technical assistance. We acknowledge Guillermo Maroniche, Natalia Almasia, Corina Fusari and Florencia del Viso for critically reading of the manuscript and helpful discussions and Dr. Veronica Lia for her assistance in statistical analysis. DZ holds a CONICET fellowship; MLB, HEH and RH are independent researchers at INTA, HEH is researcher of the CIC and Professor at the University of Buenos Aires, RH is researcher of CONICET.
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Communicated by M. Jordan.
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Zavallo, D., Lopez Bilbao, M., Hopp, H.E. et al. Isolation and functional characterization of two novel seed-specific promoters from sunflower (Helianthus annuus L.). Plant Cell Rep 29, 239–248 (2010). https://doi.org/10.1007/s00299-010-0816-x
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DOI: https://doi.org/10.1007/s00299-010-0816-x