Abstract
Annatto (Bixa orellana L.) is a Neotropical woody plant and the main source of the natural dyes bixin and norbixin. To study the bixin biosynthesis pathway and genetically improve the species, a suitable transformation protocol is required. Here, an efficient method for Agrobacterium-mediated transformation of hypocotyl segments of annatto was developed. The effect of different factors on the efficiency of transformation was examined; these included three types of antibiotics (Timentin®, cefotaxime, and meropenem) and three Agrobacterium strains (AGL1, EHA105, and GV3101) at different concentrations. The strains contained the plasmid pCAMBIA2301 harboring the gus reporter gene and nptII as a selection marker under the constitutive 35 S promoter. Strain AGL1 achieved significantly higher gus expression compared to the other candidates. The highest transformation efficiency (8.2% ± 3.8%) was obtained for cefotaxime or meropenem with strain AGL1 at OD600 = 0.5, as revealed by a gus histochemical assay in hypocotyls and regenerated shoots. This is the highest transformation frequency ever reported for the target species. The optimized protocol was successfully validated by obtaining transgenic annatto plants containing the hptII gene under constitutive expression and overexpressing miR156. Successful miR156 overexpression was confirmed by histochemical gus staining in regenerated plantlets, as well as by PCR amplification of the hptII gene. Flow cytometry confirmed that all regenerated lines were diploid, guaranteeing the genetic stability of the transgenes.
Key message
An improved method for the Agrobacterium-mediated transformation of hypocotyl segments of annatto (Bixa orellana L.) was developed and successfully validated by producing transgenic plants overexpressing microRNA 156.
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Acknowledgements
FAPEMIG (Grant numbers APQ-02372-17 and APQ-00772-19), CNPq, and CAPES (Finance code 01) are acknowledged for their financial support. Chr. Hansen Ind. Com. Ltda. (Valinhos, SP, Brazil) is acknowledged for kindly donating the seeds of Bixa orellana ‘Piave Vermelha’, and Prof. Scott Poethig and Dr. A. R. Leichty for kindly making available the miR156 overexpressing vector. DVF was the recipient of a postdoctoral scholarship from CNPq (Grant number 155615/2018-1). We would like to thank Editage (www.editage.com) for English language editing.
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The study was funded by the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) (Brasília, Brazil), Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) (Brasília, Brazil), and Fundação de Amparo à Pesquisa do Estado de Minas Gerais (FAPEMIG) (Belo Horizonte, Brazil).
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DVF and DMDF raised the in vitro plants and performed the experiments. DVF, MBSD, and KLGM performed the PCR and RT-PCR molecular analyses; EMM and LFV performed the flow cytometry experiments; DFV performed the statistical analysis; DVF, DMDF, KLGM, DSB, EMM, LFV, MGCC, and WCO contributed to the design and interpretation of the data, as well as the writing of the manuscript.
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Faria, D.V., Freitas, D.M.S., Duarte, M.B.S. et al. Agrobacterium-mediated transformation of annatto (Bixa orellana L.): protocol optimization and overexpression of microRNA 156 in transgenic plants. Plant Cell Tiss Organ Cult 148, 585–598 (2022). https://doi.org/10.1007/s11240-021-02211-2
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DOI: https://doi.org/10.1007/s11240-021-02211-2