Lux Operon Transformation of Plastids in Higher Plants
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lux operon transformation of plastids in higher plants Aranzazu Balfagón Martín Dipòsit Legal: B. 24565-2013 ADVERTIMENT. La consulta d’aquesta tesi queda condicionada a l’acceptació de les següents condicions d'ús: La difusió d’aquesta tesi per mitjà del servei TDX (www.tesisenxarxa.net) ha estat autoritzada pels titulars dels drets de propietat intel·lectual únicament per a usos privats emmarcats en activitats d’investigació i docència. No s’autoritza la seva reproducció amb finalitats de lucre ni la seva difusió i posada a disposició des d’un lloc aliè al servei TDX. No s’autoritza la presentació del seu contingut en una finestra o marc aliè a TDX (framing). Aquesta reserva de drets afecta tant al resum de presentació de la tesi com als seus continguts. En la utilització o cita de parts de la tesi és obligat indicar el nom de la persona autora. ADVERTENCIA. 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Universitat Internacional de Catalunya Departamento de Ciencias Básicas, Área de Biología Molecular y Celular, Facultad de Medicina lux operon transformation of plastids in higher plants Aranzazu Balfagón Martin TESIS DOCTORAL Sant Cugat del Vallés 2013 Universitat Internacional de Catalunya Departamento de Ciencias Básicas, Área de Biología Molecular y Celular, Facultad de Medicina lux operon transformation of plastids in higher plants Memoria de la tesis doctoral presentada por Aranzazu Balfagón Martin para optar al grado de Doctora por la Universitat Internacional de Catalunya. Trabajo realizado en el Departamento de Biología Molecular y Celular, bajo la dirección de los Doctores Agustí Fontarnau Riera y Alberto T. Estévez. Proyecto subvencionado por Fundació La Caixa, INCASOL (Generalitat de Catalunya) y MICINN. Doctoranda Director Co-director Aranzazu Balfagón Dr. A.Fontarnau Dr. A. Estévez Cuando realmente quieres una cosa, el Universo conspira para ayudarte a conseguirla. Mi Universo, mi familia A mis peludos Kimet, es nuestra Lo último que uno sabe es por dónde empezar. B. Pascal INDEX Index INDEX I. Index 09 II. Justification 15 III. Main objectives 19 IV. Introduction 23 1. General introduction 25 1.1. Nuclear transformation 1.1.1. Nuclear transformation by Agrobacterium tumefaciens 1.1.2. PEG-mediated DNA uptake and electroporation 2. Nuclear transformation vs. chloroplast transformation 27 3. Chloroplast structure and function 29 3.1. cpDNA 3.2. Chloroplast gene expression 3.2.1. Chloroplast gene expression regulation 3.2.2. Plastids RNA polymerases 3.2.3. Chloroplast operon promoters 3.2.4. Regulatory sequences 3.2.5. Operon organization 4. Chloroplast transformation 35 4.1. Plastid transformation vectors 4.2. Homologous recombination and flanking sequences 4.2.1. Homoplasmy and antibiotic resistance markers V. Hypothesis 41 VI. Experimental Procedures 47 1. In vitro plant culture and regeneration experiments 49 2. Vector construction 52 3. Biolistic transformation of chloroplasts 56 4. Molecular tools 58 4.1. cpDNA assays 4.2. SDS gel electrophoresis and Western blot 4.3. Real Time PCR 4.4. IVIS Spectrum in vivo bioluminescence assay VII. Chapter 1 In vitro regeneration of ornamentals plants 63 Introduction 65 1. Micropropagation 67 1.1. Stages of micropropagation 11 Index 2. Plant morphogenesis in vitro 68 2.1. Somatic embryogenesis 2.2. Somatic organogenesis 3. Plant tissue culture 70 3.1. Plant media 3.1.1. Plant hormones 4. Ornamental plant tissue culture 71 4.1. Ornamental species used in this study Results 77 1. Establishment of in vitro woody plant lines using leaves of greenhouse’s plants as a source 79 1.1. Disinfection of leaves and nodal segments explants 1.2. Callus induction from leaves 1.3. Callus induction from nodal shoots 1.4. Indirect regeneration from callus 2. Establishment of in vitro plant lines using seeds as a source 83 2.1. Disinfection of seeds 2.2. Seed germination 2.3. Callus induction and regeneration 2.3.1. Callus induction and regeneration in D. caryophyllus 2.3.2. Callus induction and regeneration in M. jalapa, C. scandens and C. hybridus 2.3.3. Callus induction and regeneration in P. zonale 2.3.4. Callus induction and regeneration in C. motorious 2.3.5. Callus induction and regeneration in C. argentera 2.3.6. Callus induction and regeneration in B. semperflorens 2.3.7. Callus induction and regeneration in M. incana 2.3.8. Callus induction and regeneration in A. majus 2.3.9. Callus induction and regeneration in M. viridis 2.3.10. Callus induction and regeneration in I. purpurea 2.3.11. Callus induction and regeneration in Z. elegans 2.4. Elongation and rooting Discussion 93 Conclusions 107 VIII. Chapter 2 Plastidial transformation with lux operon 111 Introduction 113 1. Bioluminescence 115 12 Index 1.1. Bioluminescence in bacteria 1.1.1. Vibrio fischeri 1.1.2. Photorhabdus luminescens 2. lux Operon 116 Results 119 1. pLDluxCDABE transformation in N.tabacum 121 1.1. pLDluxCDABE vector design 1.2. Transformation by biolistic bombardment in N.tabacum 1.3. Transgene integration checking 1.4. mRNA expression 1.5. Protein expression assay 1.6. IVIS bioluminescence assay 1.7. Rooting, acclimation and seed production 2. Design of pLDluxCDABEG transformation vector 129 3. transformation with pLDluxCDABE of ornamental plants 132 3.1 Flanking regions analysis 3.2 Biolistic bombardment Discussion 135 Conclusions 143 VII. General Discussion 147 VIII. Main Conclusions 151 IX. References 157 X. Summary in Spanish 167 XI. Acknowledgements 193 13 No tenía miedo a las dificultades: lo que la asustaba era la obligación de tener que escoger un camino. Escoger un camino significaba abandonar otros…. El Alquimista- P. Coelho JUSTIFICATION Justification JUSTIFICATION This work is part of the research in genetics of the Group of Research GENETIC ARCHITECTURES, a transversal and interdisciplinary group of the Universitat Internacional de Catalunya, recognized as Consolidated in Research (ref. 2009 SGR 862) by the Generalitat, the regional government of Catalonia (Spain). The global objective of the group is to investigate on new architectonic forms and materials to solve, in a sustainable and caring way, some of the most important human needs, such as light, heat and habitat, to reduce, at the same time, the human impact on natural environment. Its research covers two different areas of interest: a) the biodigital area, to generate new forms of inhabitable spaces, using a digital methodology and looking for inspiration in biological structures; b) the biotechnological area, to obtain new materials and organisms with added values in energetic or structural aspects and with interest in architecture. The aim of the group is to present a development model based on the management and conservation of heritage, bringing scientific advances in urban planning, taking into account human welfare and pioneering in the study of digital and biotechnological issues. In the context of the biotechnological area of the group, we present here our approach to the expression of the lux operon from bacterial sources in chloroplasts of higher plants, in order to make them able to emit visible light in an autonomous way, with no need of any external stimuli o supply of energy. It is worth to note that this work was also a pioneering attempt to transfer a whole multigenic process in chloroplasts. This metabolic pathway is due to the coordinated work of five genes in a sequential manner. Achieving this objective would also amplify the possibilities of genetic engineering technologies for others metabolic pathways. This research was supported by research competitive grants from Fundació La Caixa, INCASOL (Generalitat de Catalunya) and the Ministry of Science and Innovation-Spain (MICINN). 17 Ja hauràs pogut comprendre què volen dir les Ítaques Kavafis- L.Llach MAIN OBJECTIVES Objectives OBJECTIVES The main objective is to perform a genetic transformation of ornamental plants with an operon responsible of bioluminescence phenotype, lux operon, achieving a level of intensity in the emitted light that make transformed plants as useful elements in architecture and urban spaces. The first partial objective is to obtain organogenesis from leaves of selected ornamental plants, in which organogenesis is not an optimized process, in order to obtain good candidates for chloroplast transformation. The second partial objective is to obtain a suitable chloroplast transformation vector with lux operon as genes of interest which could express the bioluminescent phenotype in the target specie. The third partial objective is to introduce and express our genes of interest in the model specie N.tabacum and in ornamental species of interest, as a final target species.