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Research Article

Transformation of Somatic Embryos of Prunus incisa ‘February Pink’ with a Visible Reporter Gene

Eun Ju Cheong1,2,*, Margaret R. Pooler1
Plant Breeding and Biotechnology 2015;3(3):238-243.
Published online: September 30, 2015

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*Corresponding author: Eun Ju Cheong, lovegene2012@gmail.com, Tel: +82-33-250-8312, Fax: +82-33-252-8310
• Received: May 27, 2015   • Revised: June 25, 2015   • Accepted: June 28, 2015

Copyright © 2015 The Korean Society of Breeding Science

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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  • An Agrobacterium-mediated transformation system was developed for the ornamental cherry species Prunus incisa. This system uses both an antibiotic resistance gene (NPTII) and a visible selectable marker, the green fluorescent protein (GFP), to select plants. Cells from leaf and root explants were transformed with a NPTII/GFP fusion gene, and selected visually using fluorescence microscopy. Transformed cells were then induced to undergo embryogenesis and reselected by growing on media containing kanamycin. The presence of the GFP/NPTII fusion gene in all parts of transgenic plants grown in the greenhouse for one year was confirmed by PCR and Southern blot analysis. This transformation and selection system will be useful in future work to introduce genes for pathogen resistance and ornamental traits into flowering cherry germplasm.
  • Key words: Flowering cherry, Selectable marker, Green fluorescent protein, Transformation
The flowering cherry (Prunus species) is a popular ornamental plant in many temperate parts of the world. The breeding program at the U.S. National Arboretum focuses on broadening the genetic base of ornamental Prunus and developing new cultivars with superior disease and pest resistance and tolerance to environmental stresses. Due to quarantine restrictions, it has become increasingly difficult to bring new Prunus germplasm into the U.S. for breeding; hence, genetic engineering may be one of the few options to introduce genes for resistance to microbial and insect pests into Prunus.
Improved resistance to microbial and insect pests has been achieved in other crops by gene transformation. In Prunus, genetic transformation has been reported in several species, including P. domestica (Mante et al. 1991; Tian et al. 2009), P. persica (Perez-Clemente et al. 2004; Scorza et al. 1990), P. salicina (Urtubia et al. 2008), P. subhirtella (Camaro Machado et al. 1995) and P. virginiana (Dai et al. 2007). For the ornamental species, the improvement of ornamental traits and resistance to abiotic stress such as cold or heat is also important.
The reporter gene GUS has been used in many previous reports of Prunus transformation (Druart et al. 1998; Miguel and Oliveira 1999; Phillips et al. 2001; Scorza et al. 1994). The green fluorescent protein (GFP) gene, which is another visible marker for transformation, has been expressed in many crop plants (Molinier and Hahne 2000; Sidorov et al. 1999; Jordan 2000; Kaeppler et al. 2000) and several woody plants including Prunus (Ghorbel et al. 1999; Escobar et al. 2000; Maximova et al. 1998; Perez-Clemente et al. 2004); however, it has not been used to select ornamental Prunus transformants. In this study, we tested the usefulness of GFP as a selectable marker in Agrobacterium-mediated transformation of embryogenic ornamental Prunus incisa.
Plant material
Actively growing in vitro shoots of Prunus incisa ‘February Pink’ (Cheong and Pooler 2004) were transferred to MS medium containing 3% sucrose, 0.2% Gelrite, and 1uM IBA, to induce roots. Leaves and elongated roots were taken from the shoots after 3–4 weeks. Leaves were cut through the mid-vein, and the leaf margins were cut off to create a wound. The terminal 1 cm of roots was harvested and root tips were removed. Roots were rinsed with sterile liquid MS medium to remove substrate medium, and roots were wounded by gentle squeezing with forceps.
Bacterial strain and vector
The Agrobacterium binary vector pLC101 containing the EGFP/NPTII fusion gene driven by the double CaMV35S promoter (provided by Dr. Dennis Gray, University of Florida) was used in binary transformation. Agrobacterium tumefaciens strain EHA105 was used for transformation.
Cocultivation, Embryogenesis and Selection
Explants were incubated in bacterial resuspension solution (MS medium with 0.1M acetosyringone) with gentle shaking for 30 min to induce infection. Tissues were co-cultivated on solidified (0.2% Gelrite) induction medium (MS medium with 10 uM 2,4-D plus 3% sucrose) without antibiotics for three days. After co-cultivation, explants were washed with liquid MS medium containing 300 mg/L carbenicillin and 100 mg/L cefotaxime, then cultivated on induction medium with antibiotics as above. Cultures were kept in the dark at 22 ± 2°C. After 7 days of culture, calli emitting green light were selected under a fluorescence microscope using 475 nm excitation and 510 nm emission filters.
Cell clusters emitting fluorescent green light (expressing GFP) were isolated and cultivated in liquid induction medium for a week. Suspended cells were then plated onto solid media and placed in the dark until cells formed callus at least 1 mm in diameter. GFP-expressing callus was then reselected and transferred to fresh medium every two weeks. Somatic embryos were induced from this callus on embryo induction medium consisting of MS medium with 10 uM 2,4-D (Cheong and Pooler 2004) plus antibiotics as above. Induced somatic embryos were transferred to hormone-free MS medium with 50 mg/L kanamycin for selection.
DNA extraction, PCR analysis and Southern Blot analysis
Leaves, stems, and somatic embryos were used for PCR analysis of the GFP gene in transgenic plants. DNA from transgenic plants and non-transgenic controls was extracted using the DNeasy Plant Maxi Kit (Qiagen, Valencia, CA). Two primer sets were used to amplify the intact whole section (1.54 kb, 5′-GTGAGCAAGGGCGAGGAGCT-3′ and 5′-CGGCCGCTTATCAGAAGAAC-3′.) or internal section (0.6 kb, 5′-ATCAAGGTGAACTTCAAGAT-3′ and 5′-GATGGATACTTTCTCGGCAG-3′) of the EGFP/NPTII fusion gene (Fig. 1). PCR products were separated on 1.5% agarose gel and visualized by staining with ethidium bromide.
For Southern blot analysis, 5 μg of the DNA from transformed and untransformed plants was digested with BamHI at 37°C overnight, separated on a 0.8% agarose gel, and blotted onto a membrane (Amersham-Pharmacia Biotech, Sunnyvale, CA). To prepare the probe, the 542 bp NPTII fragment was amplified from the original DNA plasmid using specific NPTII primers (5′ GTTGTCACTG-AAGCGGGAAG 3′ and 5′ ACTCGTCAAGAAGGCGATAG 3′) and labeled with 32P-dATP. PCR amplification conditions were as follows: 94°C for 5 min, followed by 30 cycles of denaturation for 30 sec at 94°C, annealing for 30 s at 55°C, extension for 1 min at 72°C, followed by an additional 10 min extension at 72°C. Probe hybridization and washing of blots were performed under medium stringency conditions according to Keates et al. (2003). Blots were imaged at 200 μm resolution on a Typhoon 8600 Variable Mode Imager (Molecular Dynamics/Amersham-Pharmacia Biotech, Sunnyvale, CA).
Transformation
Within two weeks of culture in the dark, 1–2 mm cell clusters had formed on the cut edges of leaves. Cell clusters on roots were difficult to distinguish from normal epidermal cells on the surfaces. However, transformed cells expressing the green fluorescent protein gene were visible under an inverted microscope in both explants, and were found in several locations on an explant. Transformation efficiency was 7.5% for leaves and 2.6% for roots (Table 1). Despite the wounds on the root surfaces to aid bacterial infection, there were fewer transformed cells in roots than in leaf explants, although shoots development from somatic embryogenesis from root-derived cells was slightly higher than that for cells from leaves (Table 1). Cells expressing the GFP gene were selected visually using a fluorescent microscope (Fig. 2). A total of 42 cell lines were selected from leaf explants and were cultivated in liquid medium and then plated onto solidified somatic embryo induction medium. Cells grown in liquid medium for one week showed vigorous growth as opposed to cells in agar-solidified medium (data not shown). Plated cells formed callus and then roots. Eight of these callusing cell lines formed embryos and roots. From these embryos, 12 plantlets were developed and were transferred to the greenhouse for acclimatization and subsequently used for transgene detection.
Detection of transgenes in transformants by PCR and Southern blot analysis
One-year-old plants in the greenhouse did not express visually detectable levels of GFP from any plant part. However, transgenic plants were verified by both PCR and Southern blot analysis of the whole plant. Successful PCR amplification of transgenic DNA was obtained using PCR primers for the entire transformation vector and the internal EGFP/NPTII gene (Fig. 3A). The presence of the transgene was confirmed by Southern Blot analysis using the NPTII gene as a probe (Fig. 3B).
Improvements to many agricultural and horticultural crops have been made using Agrobacterium-mediated transformation (Gelvin 2003). Several factors affect the efficiency of transformation, including Agrobacterium strain, explant type, and organogenesis system. For example, Agrobacterium strain EHA105 has been shown to be an effective agent for genetic transformation of recalcitrant fruit tree species (De Bondt et al. 1994; Mourgues et al. 1996; Pena et al. 1995; Ramesh et al. 2006; Scorza et al. 1994), and proved to be effective in our study with ornamental Prunus as well. Explant type and organogenesis system are also important factors in transformation efficiency. Direct or indirect shoot regeneration from leaf discs was generally used in previous work with Prunus species (Miguel and Oliveira 1999; Ramesh et al. 2006) and other crops (De Bondt et al. 1994; Mourgues et al. 1996; Pena et al. 1995), while root pieces had rarely been used for transformation. The high rate of embryogenesis from roots in Prunus incisa (Cheong and Pooler 2004) facilitated transformation in our study. The relatively high transformation rates (2.6–7.5%) may be due to the high embryogenic efficiency from root tissue, which seemed to be unique to this species.
Using GFP as a reporter gene and a selectable marker was also advantageous in our study. Unlike other reporter genes such as GUS, cells containing GFP could be visualized non-destructively at an early stage of culture, which also allowed for early selection of transgenic cells. By optimizing bacterial strain, regeneration system, and selectable marker, we were able to obtain confirmed transgenic plants of Prunus incisa.
Fig. 1
Schematic diagram of the pLC101 vector and probe used for Southern blot analysis. LB = left border; RB, = right border; Ter = transcriptional terminator sequence; 35S P = cauliflower mosaic virus (CaMV) 35S promoter; NPTII = neomycin phosphotransferase, EGFP = enhanced green fluorescent protein.
pbb-3-238f1.jpg
Fig. 2
Callus induction and somatic embryo development of transformed Prunus incisa cells and GFP expression in transgenic plants.
(A) GFP expression in (a) single cells and cell clusters; (b and c) suspension culture and plated cultures; and (d and e) propagated callus. (B) Development of somatic embryos of transformed cells at the (a) globular stage; (b) heart-shaped stage; (c) cotyledon stage; and (d, e, and f) germination stage. (C) GFP expression in various organs of transgenic plants (a) somatic embryo; (b) plant stem; (c) apical bud; (d) axillary bud; and (e) root tip.
pbb-3-238f2.jpg
Fig. 3
Detection of the GFP gene in transgenic plants. (A) PCR analysis where a = amplification of the whole EGFT/NPTII fusion gene (1.54 kb) and b = amplification of the internal EGFP/NPTII fusion gen (0.6 kb). Lanes 1 and 2 represent non-transformed stems and leaves, respectively; Lanes 3–6 represent transformed stems, leaves, somatic embryos, and positive control plasmid DNA, respectively. (B) Southern blot analysis of non-transformed control and transformed line T26 probed with NPTII.
pbb-3-238f3.jpg
Table 1
Efficiency of callus and root induction and GFP gene transformation for leaf and root explants of Prunus incisa.
Table 1
Explant Type Total No. of treated explants No. of explants forming callus (%) No. of explants expressing GFP (%) No. of transformed plantlets
Leaf 173 83 (48%) 13 (7.5%) 6
Root 153 52 (34%) 4 (2.6%) 6
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Transformation of Somatic Embryos of Prunus incisa ‘February Pink’ with a Visible Reporter Gene
Plant Breed. Biotech.. 2015;3(3):238-243.   Published online September 30, 2015
DOI: https://doi.org/10.9787/PBB.2015.3.3.238
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Transformation of Somatic Embryos of Prunus incisa ‘February Pink’ with a Visible Reporter Gene
Plant Breed. Biotech.. 2015;3(3):238-243.   Published online September 30, 2015
DOI: https://doi.org/10.9787/PBB.2015.3.3.238
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Transformation of Somatic Embryos of Prunus incisa ‘February Pink’ with a Visible Reporter Gene
Image Image Image
Fig. 1 Schematic diagram of the pLC101 vector and probe used for Southern blot analysis. LB = left border; RB, = right border; Ter = transcriptional terminator sequence; 35S P = cauliflower mosaic virus (CaMV) 35S promoter; NPTII = neomycin phosphotransferase, EGFP = enhanced green fluorescent protein.
Fig. 2 Callus induction and somatic embryo development of transformed Prunus incisa cells and GFP expression in transgenic plants. (A) GFP expression in (a) single cells and cell clusters; (b and c) suspension culture and plated cultures; and (d and e) propagated callus. (B) Development of somatic embryos of transformed cells at the (a) globular stage; (b) heart-shaped stage; (c) cotyledon stage; and (d, e, and f) germination stage. (C) GFP expression in various organs of transgenic plants (a) somatic embryo; (b) plant stem; (c) apical bud; (d) axillary bud; and (e) root tip.
Fig. 3 Detection of the GFP gene in transgenic plants. (A) PCR analysis where a = amplification of the whole EGFT/NPTII fusion gene (1.54 kb) and b = amplification of the internal EGFP/NPTII fusion gen (0.6 kb). Lanes 1 and 2 represent non-transformed stems and leaves, respectively; Lanes 3–6 represent transformed stems, leaves, somatic embryos, and positive control plasmid DNA, respectively. (B) Southern blot analysis of non-transformed control and transformed line T26 probed with NPTII.

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Transformation of Somatic Embryos of Prunus incisa ‘February Pink’ with a Visible Reporter Gene

Efficiency of callus and root induction and GFP gene transformation for leaf and root explants of Prunus incisa.

Explant Type Total No. of treated explants No. of explants forming callus (%) No. of explants expressing GFP (%) No. of transformed plantlets
Leaf 173 83 (48%) 13 (7.5%) 6
Root 153 52 (34%) 4 (2.6%) 6
Table 1 Efficiency of callus and root induction and GFP gene transformation for leaf and root explants of Prunus incisa.

Table 1

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