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Loyola-Vargas VM, Ochoa-Alejo N. An Introduction to Plant Cell, Tissue, and Organ Culture: Current Status and Perspectives. Methods Mol Biol 2024; 2827:1-13. [PMID: 38985259 DOI: 10.1007/978-1-0716-3954-2_1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/11/2024]
Abstract
Plant cell, tissue, and organ cultures (PCTOC) have been used as experimental systems in basic research, allowing gene function demonstration through gene overexpression or repression and investigating the processes involved in embryogenesis and organogenesis or those related to the potential production of secondary metabolites, among others. On the other hand, PCTOC has also been applied at the commercial level for the vegetative multiplication (micropropagation) of diverse plant species, mainly ornamentals but also horticultural crops such as potato or fruit and tree species, and to produce high-quality disease-free plants. Moreover, PCTOC protocols are important auxiliary systems in crop breeding crops to generate pure lines (homozygous) to produce hybrids for the obtention of polyploid plants with higher yields or better performance. PCTOC has been utilized to preserve and conserve the germplasm of different crops or threatened species. Plant genetic improvement through genetic engineering and genome editing has been only possible thanks to the establishment of efficient in vitro plant regeneration protocols. Different companies currently focus on commercializing plant secondary metabolites with interesting biological activities using in vitro PCTOC. The impact of omics on PCTOC is discussed.
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Affiliation(s)
- Víctor M Loyola-Vargas
- Unidad de Biología Integrativa, Centro de Investigación Científica de Yucatán, Mérida, Yucatán, Mexico.
| | - Neftalí Ochoa-Alejo
- Departamento de Ingeniería Genética, Unidad Irapuato, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Irapuato, Guanajuato, Mexico.
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2
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Delourme D, Brémaud L, Plazanet I, Pélissier P, Label P, Boizot N, Breton C, Durand S, Costa G. Transcriptomic monitoring of Douglas-fir heartwood formation. BMC Genom Data 2023; 24:69. [PMID: 37986039 PMCID: PMC10662504 DOI: 10.1186/s12863-023-01172-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2023] [Accepted: 11/10/2023] [Indexed: 11/22/2023] Open
Abstract
OBJECTIVES Molecular cues linked to heartwood formation open new (complementary) perspectives to genetic breeding programs of Douglas-fir, a tree species largely cultivated in Europe for the natural durability and civil engineering properties of its wood. DATA DESCRIPTION RNAs from a single genotype of Douglas-fir, extracted from three distinct wood zones (outer sapwood, inner sapwood and transition zone) at four vegetative seasons to generate an extensive RNA-seq dataset used to apprehend the in-wood dynamic and seasonality of heartwood formation in this hardwood model species. Previously published data collected on somatic embryos of the same genotype could be merged with the present dataset to upgrade grade the Douglas-fir reference transcriptome.
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Affiliation(s)
- Didier Delourme
- Université de Limoges, LABCIS, UR 22722, 123 avenue Albert Thomas, Limoges, F-87060, France
| | - Laure Brémaud
- Université de Limoges, LABCIS, UR 22722, 123 avenue Albert Thomas, Limoges, F-87060, France
| | - Idelette Plazanet
- Université de Limoges, LABCIS, UR 22722, 123 avenue Albert Thomas, Limoges, F-87060, France
| | - Patrick Pélissier
- Université de Limoges, LABCIS, UR 22722, 123 avenue Albert Thomas, Limoges, F-87060, France
| | | | | | | | - Stéphanie Durand
- Université de Limoges, CAPTuR, UMR INSERM/CHU 1308, 2 Rue du Docteur Marcland, Limoges, F-87025, France
| | - Guy Costa
- Université de Limoges, LABCIS, UR 22722, 123 avenue Albert Thomas, Limoges, F-87060, France.
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Hesami M, Pepe M, de Ronne M, Yoosefzadeh-Najafabadi M, Adamek K, Torkamaneh D, Jones AMP. Transcriptomic Profiling of Embryogenic and Non-Embryogenic Callus Provides New Insight into the Nature of Recalcitrance in Cannabis. Int J Mol Sci 2023; 24:14625. [PMID: 37834075 PMCID: PMC10572465 DOI: 10.3390/ijms241914625] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2023] [Revised: 09/14/2023] [Accepted: 09/22/2023] [Indexed: 10/15/2023] Open
Abstract
Differential gene expression profiles of various cannabis calli including non-embryogenic and embryogenic (i.e., rooty and embryonic callus) were examined in this study to enhance our understanding of callus development in cannabis and facilitate the development of improved strategies for plant regeneration and biotechnological applications in this economically valuable crop. A total of 6118 genes displayed significant differential expression, with 1850 genes downregulated and 1873 genes upregulated in embryogenic callus compared to non-embryogenic callus. Notably, 196 phytohormone-related genes exhibited distinctly different expression patterns in the calli types, highlighting the crucial role of plant growth regulator (PGRs) signaling in callus development. Furthermore, 42 classes of transcription factors demonstrated differential expressions among the callus types, suggesting their involvement in the regulation of callus development. The evaluation of epigenetic-related genes revealed the differential expression of 247 genes in all callus types. Notably, histone deacetylases, chromatin remodeling factors, and EMBRYONIC FLOWER 2 emerged as key epigenetic-related genes, displaying upregulation in embryogenic calli compared to non-embryogenic calli. Their upregulation correlated with the repression of embryogenesis-related genes, including LEC2, AGL15, and BBM, presumably inhibiting the transition from embryogenic callus to somatic embryogenesis. These findings underscore the significance of epigenetic regulation in determining the developmental fate of cannabis callus. Generally, our results provide comprehensive insights into gene expression dynamics and molecular mechanisms underlying the development of diverse cannabis calli. The observed repression of auxin-dependent pathway-related genes may contribute to the recalcitrant nature of cannabis, shedding light on the challenges associated with efficient cannabis tissue culture and regeneration protocols.
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Affiliation(s)
- Mohsen Hesami
- Department of Plant Agriculture, University of Guelph, Guelph, ON N1G 2W1, Canada; (M.H.)
| | - Marco Pepe
- Department of Plant Agriculture, University of Guelph, Guelph, ON N1G 2W1, Canada; (M.H.)
| | - Maxime de Ronne
- Département de Phytologie, Université Laval, Quebec, QC G1V 0A6, Canada
- Institut de Biologie Intégrative et des Systèmes (IBIS), Université Laval, Quebec, QC G1V 0A6, Canada
- Centre de Recherche et d’innovation sur les Végétaux (CRIV), Université Laval, Quebec, QC G1V 0A6, Canada
| | | | - Kristian Adamek
- Department of Plant Agriculture, University of Guelph, Guelph, ON N1G 2W1, Canada; (M.H.)
| | - Davoud Torkamaneh
- Département de Phytologie, Université Laval, Quebec, QC G1V 0A6, Canada
- Institut de Biologie Intégrative et des Systèmes (IBIS), Université Laval, Quebec, QC G1V 0A6, Canada
- Centre de Recherche et d’innovation sur les Végétaux (CRIV), Université Laval, Quebec, QC G1V 0A6, Canada
- Institut Intelligence et Données (IID), Université Laval, Quebec, QC G1V 0A6, Canada
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Large-Scale Quantitative Proteomic Analysis during Different Stages of Somatic Embryogenesis in Larix olgensis. Curr Issues Mol Biol 2023; 45:2021-2034. [PMID: 36975500 PMCID: PMC10047913 DOI: 10.3390/cimb45030130] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2023] [Revised: 02/25/2023] [Accepted: 02/28/2023] [Indexed: 03/06/2023] Open
Abstract
Larix olgensis is an economically important tree species native to northeastern China. The use of somatic embryogenesis (SE) is efficient and enables the rapid production of varieties with desirable qualities. Here, isobaric labeling via tandem mass tags was used to conduct a large-scale quantitative proteomic analysis of proteins in three critically important stages of SE in L. olgensis: the primary embryogenic callus, the single embryo, and the cotyledon embryo. We identified 6269 proteins, including 176 shared differentially expressed proteins across the three groups. Many of these proteins are involved in glycolipid metabolism, hormone response/signal transduction, cell synthesis and differentiation, and water transport; proteins involved in stress resistance and secondary metabolism, as well as transcription factors, play key regulatory roles in SE. The results of this study provide new insights into the key pathways and proteins involved in SE in Larix. Our findings have implications for the expression of totipotency, the preparation of synthetic seeds, and genetic transformation.
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Välimäki S, Teyssier C, Tikkinen M, Delile A, Boizot N, Varis S, Lelu-Walter MA, Aronen T. Norway spruce somatic embryogenesis benefits from proliferation of embryogenic tissues on filter discs and cold storage of cotyledonary embryos. FRONTIERS IN PLANT SCIENCE 2022; 13:1031686. [PMID: 36388484 PMCID: PMC9647157 DOI: 10.3389/fpls.2022.1031686] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/30/2022] [Accepted: 10/07/2022] [Indexed: 06/12/2023]
Abstract
Vegetative propagation opens opportunities for the multiplication of elite tree progeny for forest regeneration material. For conifers such as Norway spruce (Picea abies) the most efficient vegetative propagation method is seed multiplication through somatic embryogenesis. Efficient culture methods are needed for somatic embryogenesis to be commercially viable. Compared to culturing as clumps, filter disc cultures can improve the proliferation of embryogenic tissue (ET) due to more even spread and better developmental synchronization. In this study, ET proliferation on filter discs was compared to proliferation as clumps. The study comprised 28 genotypes in four trials. The benefits of adding a pre-maturation step and the selection of fresh ET for the subculture were evaluated. Pre-maturation on hormone-free media before maturation did not significantly improve embryo yield but improved greenhouse survival from 69% to 80%, although there was high variation between lines. Filter disc cultivation of ET did result in better growth than in clumps but was more dependent on ET selection and the amount of ET than the clump cultivation method. Filter proliferation also favors certain lines. Post-maturation storage can be used to change the storage compound composition of the produced mature embryos. The embryo storage compound profile was analyzed after post-maturation cold storage treatments of 0, 4, 8, 31, and 61 weeks and compared to that of the zygotic embryos. Cold storage made the storage compound profile of somatic embryos closer to that of zygotic embryos, especially regarding the raffinose family oligosaccharides and storage proteins. Sucrose, hexose, and starch content remained higher in somatic embryos even through cold storage. Prolonged storage appeared less beneficial for embryos, some of which then seemed to spontaneously enter the germination process.
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Affiliation(s)
- Sakari Välimäki
- Production Systems, Natural Resources Institute Finland (Luke), Savonlinna, Finland
| | - Caroline Teyssier
- Institut national de recherche pour Íagriculture, Íalimentation et Íenvironnement (INRAE), Office national des forê ts (ONF), BioForA, Orléans, France
| | - Mikko Tikkinen
- Production Systems, Natural Resources Institute Finland (Luke), Savonlinna, Finland
| | - Armelle Delile
- Institut national de recherche pour Íagriculture, Íalimentation et Íenvironnement (INRAE), Office national des forê ts (ONF), BioForA, Orléans, France
| | - Nathalie Boizot
- Institut national de recherche pour Íagriculture, Íalimentation et Íenvironnement (INRAE), Office national des forê ts (ONF), BioForA, Orléans, France
| | - Saila Varis
- Production Systems, Natural Resources Institute Finland (Luke), Savonlinna, Finland
| | - Marie-Anne Lelu-Walter
- Institut national de recherche pour Íagriculture, Íalimentation et Íenvironnement (INRAE), Office national des forê ts (ONF), BioForA, Orléans, France
| | - Tuija Aronen
- Production Systems, Natural Resources Institute Finland (Luke), Savonlinna, Finland
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Elhiti M, Stasolla C. Transduction of Signals during Somatic Embryogenesis. PLANTS (BASEL, SWITZERLAND) 2022; 11:178. [PMID: 35050066 PMCID: PMC8779037 DOI: 10.3390/plants11020178] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/22/2021] [Revised: 12/30/2021] [Accepted: 01/07/2022] [Indexed: 05/05/2023]
Abstract
Somatic embryogenesis (SE) is an in vitro biological process in which bipolar structures (somatic embryos) can be induced to form from somatic cells and regenerate into whole plants. Acquisition of the embryogenic potential in culture is initiated when some competent cells within the explants respond to inductive signals (mostly plant growth regulators, PRGs), and de-differentiate into embryogenic cells. Such cells, "canalized" into the embryogenic developmental pathway, are able to generate embryos comparable in structure and physiology to their in vivo counterparts. Genomic and transcriptomic studies have identified several pathways governing the initial stages of the embryogenic process. In this review, the authors emphasize the importance of the developmental signals required for the progression of embryo development, starting with the de-differentiation of somatic cells and culminating with tissue patterning during the formation of the embryo body. The action and interaction of PGRs are highlighted, along with the participation of master regulators, mostly transcription factors (TFs), and proteins involved in stress responses and the signal transduction required for the initiation of the embryogenic process.
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Affiliation(s)
- Mohamed Elhiti
- Department of Botany, Faculty of Science, Tanta University, Tanta 31527, Egypt;
| | - Claudio Stasolla
- Department of Plant Science, University of Manitoba, Winnipeg, MB R3T2N2, Canada
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7
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Current Proteomic and Metabolomic Knowledge of Zygotic and Somatic Embryogenesis in Plants. Int J Mol Sci 2021; 22:ijms222111807. [PMID: 34769239 PMCID: PMC8583726 DOI: 10.3390/ijms222111807] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2021] [Revised: 10/13/2021] [Accepted: 10/27/2021] [Indexed: 11/16/2022] Open
Abstract
Embryogenesis is the primary developmental program in plants. The mechanisms that underlie the regulation of embryogenesis are an essential research subject given its potential contribution to mass in vitro propagation of profitable plant species. Somatic embryogenesis (SE) refers to the use of in vitro techniques to mimic the sexual reproduction program known as zygotic embryogenesis (ZE). In this review, we synthesize the current state of research on proteomic and metabolomic studies of SE and ZE in angiosperms (monocots and dicots) and gymnosperms. The most striking finding was the small number of studies addressing ZE. Meanwhile, the research effort focused on SE has been substantial but disjointed. Together, these research gaps may explain why the embryogenic induction stage and the maturation of the somatic embryo continue to be bottlenecks for efficient and large-scale regeneration of plants. Comprehensive and integrative studies of both SE and ZE are needed to provide the molecular foundation of plant embryogenesis, information which is needed to rationally guide experimental strategies to solve SE drawbacks in each species.
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8
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Aroonluk S, Roytrakul S, Jantasuriyarat C. Identification and Characterization of Phosphoproteins in Somatic Embryogenesis Acquisition during Oil Palm Tissue Culture. PLANTS 2019; 9:plants9010036. [PMID: 31881678 PMCID: PMC7020188 DOI: 10.3390/plants9010036] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/07/2019] [Revised: 12/08/2019] [Accepted: 12/23/2019] [Indexed: 11/16/2022]
Abstract
Somatic embryogenesis during oil palm tissue culture is a long process. The identification of the proteins that control this process may help to shorten the time of oil palm tissue culture. We collected embryogenic callus and somatic embryos at the globular, torpedo, and cotyledon maturation stages, as well as from plantlets, for total protein extraction. An enrichment column was used to enrich the phosphoproteins, which were subjected to tryptic enzyme digestion. Each sample was analyzed with nano-liquid chromatography-tandem mass spectrometry (nano LC-MS/MS). A total of 460 phosphoproteins were identified and analyzed. The functional characterization of phosphoproteins were observed as highest in the metabolic process, protein/nucleotide/ion binding, and membrane component. The different phosphoproteins are involved in the control of vegetative growth, cellular differentiation, cell morphogenesis, and signaling roles in plants. The Quantitative Real-Time Reverse Transcription-PCR technique (qPCR) was successfully used to verify the expression of genes, and the results were consistent with the level of protein expression from nano-LC-MS/MS. The E3 ubiquitin-protein ligase and sister chromatid cohesion PDS5 were specifically expressed only in the somatic embryo and plantlet, and these could be used as protein biomarkers to determine the oil palm somatic embryo maturation stage. This study sheds light on the protein phosphorylation mechanism that regulates somatic embryogenesis transition during oil palm tissue culture.
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Affiliation(s)
- Suvichark Aroonluk
- Department of Genetics, Faculty of Science, Kasetsart University, Bangkok 10900, Thailand;
| | - Sittiruk Roytrakul
- National Center for Genetic Engineering and Biotechnology (BIOTEC), Klong Luang, Pathumthani 12120, Thailand;
| | - Chatchawan Jantasuriyarat
- Department of Genetics, Faculty of Science, Kasetsart University, Bangkok 10900, Thailand;
- Center for Advanced Studies in Tropical Natural Resources, National Research University-Kasetsart (CASTNAR, NRU-KU), Kasetsart University, Bangkok 10900, Thailand
- Omics Center for Agriculture, Bioresources, Food and Health, Kasetsart University (OmiKU), Kasetsart University, Bangkok 10900, Thailand
- Correspondence:
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Martínez MT, San-José MDC, Arrillaga I, Cano V, Morcillo M, Cernadas MJ, Corredoira E. Holm Oak Somatic Embryogenesis: Current Status and Future Perspectives. FRONTIERS IN PLANT SCIENCE 2019; 10:239. [PMID: 30967881 PMCID: PMC6438927 DOI: 10.3389/fpls.2019.00239] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/27/2018] [Accepted: 02/12/2019] [Indexed: 05/11/2023]
Abstract
Quercus ilex (holm oak) is one of the most representative trees in the Mediterranean basin, but now the sustainability of its ecosystems is at serious risk due to the lack of natural regeneration and to the presence of a severe disease called oak decline that has caused the death of thousands of trees. The application of biotechnological tools, such as somatic embryogenesis, allows programs of genetic improvement of the species to be speeded up and helps in the conservation of its ecosystems. Somatic embryogenesis is currently considered one of the main biotechnological techniques that has demonstrated significant benefits when has applied to forest tree species, providing significant advantages such as mass propagation, genetic transformation, application of synthetic seed, and cryopreservation of elite genotypes. In this report, the state of the art of somatic embryogenesis in holm oak is reviewed. Factors affecting the induction (plant donor age, type of explant, or plant growth regulators) and maintenance and proliferation of the embryogenic cultures are summarized. Advances on the conversion of somatic embryos into plants and on the acclimatization of these plantlets, as well as the results obtained on the application of the genetic transformation and the cryopreservation procedures to holm oak embryogenic cultures, are also presented.
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Affiliation(s)
- María Teresa Martínez
- Instituto de Investigaciones Agrobiológicas de Galicia (IIAG-CSIC), Santiago de Compostela, Spain
| | | | - Isabel Arrillaga
- ISIC/ERI Biotec/Med, Departamento de Biología Vegetal, Facultad de Farmacia, Universitat de València, Valencia, Spain
| | - Vanesa Cano
- Instituto de Investigaciones Agrobiológicas de Galicia (IIAG-CSIC), Santiago de Compostela, Spain
| | - Marián Morcillo
- ISIC/ERI Biotec/Med, Departamento de Biología Vegetal, Facultad de Farmacia, Universitat de València, Valencia, Spain
| | - María José Cernadas
- Instituto de Investigaciones Agrobiológicas de Galicia (IIAG-CSIC), Santiago de Compostela, Spain
| | - Elena Corredoira
- Instituto de Investigaciones Agrobiológicas de Galicia (IIAG-CSIC), Santiago de Compostela, Spain
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Gautier F, Label P, Eliášová K, Leplé JC, Motyka V, Boizot N, Vondráková Z, Malbeck J, Trávníčková A, Le Metté C, Lesage-Descauses MC, Lomenech AM, Trontin JF, Costa G, Lelu-Walter MA, Teyssier C. Cytological, Biochemical and Molecular Events of the Embryogenic State in Douglas-fir ( Pseudotsuga menziesii [Mirb.]). FRONTIERS IN PLANT SCIENCE 2019; 10:118. [PMID: 30873184 PMCID: PMC6403139 DOI: 10.3389/fpls.2019.00118] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/02/2018] [Accepted: 01/23/2019] [Indexed: 05/08/2023]
Abstract
Somatic embryogenesis techniques have been developed for most coniferous species, but only using very juvenile material. To extend the techniques' scope, better integrated understanding of the key biological, physiological and molecular characteristics of embryogenic state is required. Therefore, embryonal masses (EMs) and non-embryogenic calli (NECs) have been compared during proliferation at multiple levels. EMs and NECs originating from a single somatic embryo (isogenic lines) of each of three unrelated genotypes were used in the analyses, which included comparison of the lines' anatomy by transmission light microscopy, transcriptomes by RNAseq Illumina sequencing, proteomes by free-gel analysis, contents of endogenous phytohormones (indole-3-acetic acid, cytokinins and ABA) by LC-MS analysis, and soluble sugar contents by HPLC. EMs were characterized by upregulation (relative to levels in NECs) of transcripts, proteins, transcription factors and active cytokinins associated with cell differentiation accompanied by histological, carbohydrate content and genetic markers of cell division. In contrast, NECs were characterized by upregulation (relative to levels in EMs) of transcripts, proteins and products associated with responses to stimuli (ABA, degradation forms of cytokinins, phenols), oxidative stress (reactive oxygen species) and carbohydrate storage (starch). Sub-Network Enrichment Analyses that highlighted functions and interactions of transcripts and proteins that significantly differed between EMs and NECs corroborated these findings. The study shows the utility of a novel approach involving integrated multi-scale transcriptomic, proteomic, biochemical, histological and anatomical analyses to obtain insights into molecular events associated with embryogenesis and more specifically to the embryogenic state of cell in Douglas-fir.
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Affiliation(s)
- Florian Gautier
- BioForA, INRA, ONF, Orléans, France
- PEIRENE, Sylva LIM, Université de Limoges, Limoges, France
| | | | - Kateřina Eliášová
- Institute of Experimental Botany of the Czech Academy of Sciences, Prague, Czechia
| | | | - Václav Motyka
- Institute of Experimental Botany of the Czech Academy of Sciences, Prague, Czechia
| | | | - Zuzana Vondráková
- Institute of Experimental Botany of the Czech Academy of Sciences, Prague, Czechia
| | - Jiří Malbeck
- Institute of Experimental Botany of the Czech Academy of Sciences, Prague, Czechia
| | - Alena Trávníčková
- Institute of Experimental Botany of the Czech Academy of Sciences, Prague, Czechia
| | | | | | - Anne-Marie Lomenech
- Centre de Génomique Fonctionnelle, Plateforme Protéome, University of Bordeaux, Bordeaux, France
| | | | - Guy Costa
- PEIRENE, Sylva LIM, Université de Limoges, Limoges, France
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Arrillaga I, Morcillo M, Zanón I, Lario F, Segura J, Sales E. New Approaches to Optimize Somatic Embryogenesis in Maritime Pine. FRONTIERS IN PLANT SCIENCE 2019; 10:138. [PMID: 30838010 PMCID: PMC6389691 DOI: 10.3389/fpls.2019.00138] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/15/2018] [Accepted: 01/28/2019] [Indexed: 05/22/2023]
Abstract
Maritime pine (Pinus pinaster Aiton) is a coniferous native of the Mediterranean basin. Because of its adaptability to a wide range of environmental conditions, the species have become a model for studies in coniferous forest management and functional genomics. Somatic embryogenesis (SE) has been so far, the preferred biotechnological strategy for maritime pine breeding programs initiated at the middle-end of the 20th century. To overcome the limitations of the induction and maturation phases in maritime pine SE, we analyzed the possible maternal influence on the embryogenic capability of megagametophytes from controlled crosses, as well as the effect of the temperature and water availability during SE process on the production of plants. A strong maternal effect on the embryogenic potential of maritime pine megagametophytes was observed in our experiments using half-sib and full-sib progenies, while paternal effect was almost undetectable. Besides, it seems possible to improve somatic embryo production of maritime pine megagametophytes by adjusting optimal temperature throughout the process: 28°C during induction and proliferation, and 23°C during the maturation phase. Using induction and proliferation media with reduced water availability (6 g/L Gelrite) can also increase embryo production. Since other limitation of maritime pine SE is culture decline of embryogenic masses (EMs), that reduces embryo yield and germination, we assessed the profile of ABA and IAA and the expression of two embryogenesis-related genes (LEC1 and WOX2) during maturation of EMs of two morphotypes that differed in their maturation capability. Spiky morphotype (SK), with high maturation capability, had a steady increase in both hormones along the 12 weeks of the maturation, whereas ABA content in smooth morphotype picked at the 4th week and dropped. EMs with this morphotype also had a higher IAA content at the beginning of the maturation. A decrease of LEC1 and WOX2 gene expression over the course of embryo development was found to be characteristic of the SK with high maturation capability.
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Affiliation(s)
- Isabel Arrillaga
- ERI BiotecMed, Departamento de Biología Vegetal, Facultad de Farmacia, Universidad de Valencia, Valencia, Spain
- *Correspondence: Isabel Arrillaga,
| | - Marian Morcillo
- ERI BiotecMed, Departamento de Biología Vegetal, Facultad de Farmacia, Universidad de Valencia, Valencia, Spain
| | - Israel Zanón
- ERI BiotecMed, Departamento de Biología Vegetal, Facultad de Farmacia, Universidad de Valencia, Valencia, Spain
| | - Francisco Lario
- TRAGSA, Vivero de Maceda, Carretera Maceda – Baldrei, Ourense, Spain
| | - Juan Segura
- ERI BiotecMed, Departamento de Biología Vegetal, Facultad de Farmacia, Universidad de Valencia, Valencia, Spain
| | - Ester Sales
- Departamento de Ciencias Agrarias y del Medio Natural, Escuela Politécnica Superior, Instituto Universitario de Ciencias Ambientales, Universidad de Zaragoza, Huesca, Spain
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12
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Varis S, Klimaszewska K, Aronen T. Somatic Embryogenesis and Plant Regeneration From Primordial Shoot Explants of Picea abies (L.) H. Karst. Somatic Trees. FRONTIERS IN PLANT SCIENCE 2018; 9:1551. [PMID: 30405679 PMCID: PMC6207908 DOI: 10.3389/fpls.2018.01551] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/04/2018] [Accepted: 10/03/2018] [Indexed: 05/24/2023]
Abstract
The recalcitrance of adult conifer tissues has prevented vegetative propagation of trees with known and desired characteristics. Somatic embryogenesis (SE) initiation protocol, recently developed for white spruce (Picea glauca, Klimaszewska et al., 2011), was applied in order to examine the feasibility, frequency and timing of SE induction from primordial shoots (PS) of Norway spruce (P. abies). In total, 39 genotypes were screened from 2015 to 2017 using 4-6 years old trees of SE origin as explant donors. Two genotypes responded: 11Pa3794 produced six proliferating embryonal mass (EM) sublines and 11Pa4066 produced 23 EM sublines. SE initiations occurred at the beginning of April, when the temperature sum (d.d.) started to accumulate, and at the end of October or beginning of November when the chilling unit (ch.u.) sum was over 500. EM sublines from both genotypes contained numerous early somatic embryos as detected by acetocarmine staining. The sublines of 11Pa4066 produced the mean of 78.6 ± 12.8 cotyledonary somatic embryos /g FW, but 11Pa3794 produced only a few cotyledonary somatic embryos that were able to germinate. The original EM lines (from which the trees were regenerated) had produced the same number of somatic embryos in 2011 maturations, which was approximately 120 somatic embryos /g FW. Microsatellite analyses conducted with both responsive genotypes confirmed the genetic stability of the EM sublines compared with the donor trees growing in the field. SE protocol developed for white spruce PS explants was also suitable for PS of Norway spruce if the explants were in the responsive developmental stage.
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Affiliation(s)
- Saila Varis
- Natural Resources Institute Finland (Luke), Savonlinna, Finland
| | - Krystyna Klimaszewska
- Natural Resources Canada, Canadian Forest Service, Laurentian Forestry Centre, Quebec, QC, Canada
| | - Tuija Aronen
- Natural Resources Institute Finland (Luke), Savonlinna, Finland
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