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Biotechnological Interventions in Tomato ( Solanum lycopersicum) for Drought Stress Tolerance: Achievements and Future Prospects. BIOTECH (BASEL (SWITZERLAND)) 2022; 11:biotech11040048. [PMID: 36278560 PMCID: PMC9624322 DOI: 10.3390/biotech11040048] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/31/2022] [Revised: 10/13/2022] [Accepted: 10/14/2022] [Indexed: 11/07/2022]
Abstract
Tomato production is severely affected by abiotic stresses (drought, flood, heat, and salt) and causes approximately 70% loss in yield depending on severity and duration of the stress. Drought is the most destructive abiotic stress and tomato is very sensitive to the drought stress, as cultivated tomato lack novel gene(s) for drought stress tolerance. Only 20% of agricultural land worldwide is irrigated, and only 14.51% of that is well-irrigated, while the rest is rain fed. This scenario makes drought very frequent, which restricts the genetically predetermined yield. Primarily, drought disturbs tomato plant physiology by altering plant–water relation and reactive oxygen species (ROS) generation. Many wild tomato species have drought tolerance gene(s); however, their exploitation is very difficult because of high genetic distance and pre- and post-transcriptional barriers for embryo development. To overcome these issues, biotechnological methods, including transgenic technology and CRISPR-Cas, are used to enhance drought tolerance in tomato. Transgenic technology permitted the exploitation of non-host gene/s. On the other hand, CRISPR-Cas9 technology facilitated the editing of host tomato gene(s) for drought stress tolerance. The present review provides updated information on biotechnological intervention in tomato for drought stress management and sustainable agriculture.
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Shah SH, Ali S, Qureshi AA, Zia MA, Jalal-Ud-Din, Ali GM. WITHDRAWN: Physiological and biochemical characterization of tomato transgenic lines overexpressing Arabidopsis thaliana cold responsive-element binding factor 3 (AtCBF3) gene under chilling stress. J Biotechnol 2015:S0168-1656(15)30235-2. [PMID: 26732415 DOI: 10.1016/j.jbiotec.2015.12.036] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2015] [Revised: 12/19/2015] [Accepted: 12/22/2015] [Indexed: 11/16/2022]
Abstract
This article has been withdrawn at the request of the author(s) and/or editor. The Publisher apologizes for any inconvenience this may cause. The full Elsevier Policy on Article Withdrawal can be found at http://www.elsevier.com/locate/withdrawalpolicy.
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Affiliation(s)
- Sabir Hussain Shah
- Department of Agricultural Sciences, Allama Iqbal Open University, Islamabad, Pakistan.
| | - Shaukat Ali
- National Institute for Genomics & Advanced Biotechnology (NIGAB), National Agricultural Research Centre (NARC), Islamabad, Pakistan
| | - Abdul Ahad Qureshi
- Department of Horticulture, Pir Mehr Ali Shah Arid Agriculture University, Rawalpindi, Pakistan
| | - Muhammad Amir Zia
- National Institute for Genomics & Advanced Biotechnology (NIGAB), National Agricultural Research Centre (NARC), Islamabad, Pakistan
| | - Jalal-Ud-Din
- Plant Physiology Program, National Agricultural Research Centre (NARC), Islamabad, Pakistan
| | - Ghulam Muhammad Ali
- National Institute for Genomics & Advanced Biotechnology (NIGAB), National Agricultural Research Centre (NARC), Islamabad, Pakistan
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Woo HJ, Qin Y, Park SY, Park SK, Cho YG, Shin KS, Lim MH, Cho HS. Development of Selectable Marker-Free Transgenic Rice Plants with Enhanced Seed Tocopherol Content through FLP/FRT-Mediated Spontaneous Auto-Excision. PLoS One 2015; 10:e0132667. [PMID: 26172549 PMCID: PMC4501831 DOI: 10.1371/journal.pone.0132667] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2015] [Accepted: 06/17/2015] [Indexed: 12/16/2022] Open
Abstract
Development of marker-free transgenic plants is a technical alternative for avoiding concerns about the safety of selectable marker genes used in genetically modified (GM) crops. Here, we describe the construction of a spontaneous self-excision binary vector using an oxidative stress-inducible modified FLP/FRT system and its successful application to produce marker-free transgenic rice plants with enhanced seed tocopherol content. To generate selectable marker-free transgenic rice plants, we constructed a binary vector using the hpt selectable marker gene and the rice codon-optimized FLP (mFLP) gene under the control of an oxidative stress-inducible promoter between two FRT sites, along with multiple cloning sites for convenient cloning of genes of interest. Using this pCMF binary vector with the NtTC gene, marker-free T1 transgenic rice plants expressing NtTC were produced by Agrobacterium-mediated stable transformation using hygromycin as a selective agent, followed by segregation of selectable marker genes. Furthermore, α-, γ-, and total tocopherol levels were significantly increased in seeds of the marker-free transgenic TC line compared with those of wild-type plants. Thus, this spontaneous auto-excision system, incorporating an oxidative stress-inducible mFLP/FRT system to eliminate the selectable marker gene, can be easily adopted and used to efficiently generate marker-free transgenic rice plants. Moreover, nutritional enhancement of rice seeds through elevation of tocopherol content coupled with this marker-free strategy may improve human health and public acceptance of GM rice.
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Affiliation(s)
- Hee-Jong Woo
- Biosafety Division, National Academy of Agricultural Science, Rural Development Administration (RDA), Jeonju, Republic of Korea
- * E-mail:
| | - Yang Qin
- Biosafety Division, National Academy of Agricultural Science, Rural Development Administration (RDA), Jeonju, Republic of Korea
| | - Soo-Yun Park
- Biosafety Division, National Academy of Agricultural Science, Rural Development Administration (RDA), Jeonju, Republic of Korea
| | - Soon Ki Park
- School of Applied Biosciences, Kyungpook National University, Daegu, Republic of Korea
| | - Yong-Gu Cho
- Department of Crop Science, Chungbuk National University, Cheongju, Republic of Korea
| | - Kong-Sik Shin
- Biosafety Division, National Academy of Agricultural Science, Rural Development Administration (RDA), Jeonju, Republic of Korea
| | - Myung-Ho Lim
- Biosafety Division, National Academy of Agricultural Science, Rural Development Administration (RDA), Jeonju, Republic of Korea
| | - Hyun-Suk Cho
- Biosafety Division, National Academy of Agricultural Science, Rural Development Administration (RDA), Jeonju, Republic of Korea
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Polóniová Z, Jopčík M, Matušíková I, Libantová J, Moravčíková J. The pollen- and embryo-specific Arabidopsis DLL promoter bears good potential for application in marker-free Cre/loxP self-excision strategy. PLANT CELL REPORTS 2015; 34:469-81. [PMID: 25504050 DOI: 10.1007/s00299-014-1726-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/20/2014] [Revised: 11/10/2014] [Accepted: 12/03/2014] [Indexed: 06/04/2023]
Abstract
KEY MESSAGE Marker-free transgenic plants can be generated with high efficiency by using the Cre/ lox P self-excision system controlled by the pollen- and embryo-specific Arabidopsis DLL promoter. In this work, we aimed to study the feasibility of using the pollen- and embryo-specific DLL promoter of the At4g16160 gene from Arabidopsis thaliana in a Cre/loxP self-excision strategy. A Cre/loxP self-excision cassette controlled by the DLL promoter was introduced into the tobacco genome via Agrobacterium-mediated transformation. No evidence for premature activation of the Cre/loxP system was observed in primary transformants. The efficiency of nptII removal during pollen and embryo development was investigated in transgenic T1 progenies derived from eight self- and four cross-pollinated T0 lines, respectively. Segregation and rooting assays were performed to select recombined T1 plants. Molecular analyses of these plants confirmed the excision event in all analysed T0 lines and marker-free transgenic T1 plants were obtained with efficiency of up to 96.2%. The Arabidopsis DLL promoter appears to be a strong candidate to drive Cre-mediated recombination not only in tobacco as a model plant, but also in other plant species.
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Affiliation(s)
- Zuzana Polóniová
- Institute of Plant Genetics and Biotechnology, Slovak Academy of Sciences, Akademicka 2, P.O. Box 39A, 95 007, Nitra, Slovak Republic,
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Cre-loxP-based system for removal and reuse of selection markers in Ashbya gossypii targeted engineering. Fungal Genet Biol 2014; 68:1-8. [DOI: 10.1016/j.fgb.2014.04.009] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2013] [Revised: 04/18/2014] [Accepted: 04/21/2014] [Indexed: 01/13/2023]
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Darwish NA, Khan RS, Ntui VO, Nakamura I, Mii M. Generation of selectable marker-free transgenic eggplant resistant to Alternaria solani using the R/RS site-specific recombination system. PLANT CELL REPORTS 2014; 33:411-421. [PMID: 24311155 DOI: 10.1007/s00299-013-1541-z] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/31/2013] [Revised: 11/02/2013] [Accepted: 11/12/2013] [Indexed: 06/02/2023]
Abstract
KEY MESSAGE Marker-free transgenic eggplants, exhibiting enhanced resistance to Alternaria solani , can be generated on plant growth regulators (PGRs)- and antibiotic-free MS medium employing the multi-auto-transformation (MAT) vector, pMAT21 - wasabi defensin , wherein isopentenyl transferase ( ipt ) gene is used as a positive selection marker. ABSTRACT Use of the selection marker genes conferring antibiotic or herbicide resistance in transgenic plants has been considered a serious problem for environment and the public. Multi-auto-transformation (MAT) vector system has been one of the tools to excise the selection marker gene and produce marker-free transgenic plants. Ipt gene was used as a selection marker gene. Wasabi defensin gene, isolated from Wasabia japonica (a Japanese horseradish which has been a potential source of antimicrobial proteins), was used as a gene of interest. Wasabi defensin gene was cloned from the binary vector, pEKH-WD, to an ipt-type MAT vector, pMAT21, by gateway cloning technology and transferred to Agrobacterium tumefaciens strain EHA105. Infected cotyledon explants of eggplant were cultured on PGRs- and antibiotic-free MS medium. Extreme shooty phenotype/ipt shoots were produced by the explants infected with the pMAT21-wasabi defensin (WD). The same PGRs- and antibiotic-free MS medium was used in subcultures of the ipt shoots. Subsequently, morphologically normal shoots emerged from the Ipt shoots. Molecular analyses of genomic DNA from transgenic plants confirmed the integration of the WD gene and excision of the selection marker (ipt gene). Expression of the WD gene was confirmed by RT-PCR and Northern blot analyses. In vitro whole plant and detached leaf assay of the marker-free transgenic plants exhibited enhanced resistance against Alternaria solani.
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Affiliation(s)
- Nader Ahmed Darwish
- Laboratory of Plant Cell Technology, Graduate School of Horticulture, Chiba University, 648 Matsudo, Matsudo, Chiba, 271-8510, Japan
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Bergougnoux V. The history of tomato: From domestication to biopharming. Biotechnol Adv 2014; 32:170-89. [DOI: 10.1016/j.biotechadv.2013.11.003] [Citation(s) in RCA: 169] [Impact Index Per Article: 16.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2013] [Revised: 10/24/2013] [Accepted: 11/03/2013] [Indexed: 11/28/2022]
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Yu Y, Wang Y, Tong Q, Liu X, Su F, Quan F, Guo Z, Zhang Y. A site-specific recombinase-based method to produce antibiotic selectable marker free transgenic cattle. PLoS One 2013; 8:e62457. [PMID: 23658729 PMCID: PMC3641042 DOI: 10.1371/journal.pone.0062457] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2013] [Accepted: 03/21/2013] [Indexed: 12/24/2022] Open
Abstract
Antibiotic selectable marker genes have been widely used to generate transgenic animals. Once transgenic animals have been obtained, the selectable marker is no longer necessary but raises public concerns regarding biological safety. The aim of this study was to prepare competent antibiotic selectable marker free transgenic cells for somatic cell nuclear transfer (SCNT). PhiC31 intergrase was used to insert a transgene cassette into a "safe harbor" in the bovine genome. Then, Cre recombinase was employed to excise the selectable marker under the monitoring of a fluorescent double reporter. By visually tracking the phenotypic switch from red to green fluorescence, antibiotic selectable marker free cells were easily detected and sorted by fluorescence-activated cell sorting. For safety, we used phiC31 mRNA and cell-permeant Cre protein in this study. When used as donor nuclei for SCNT, these safe harbor integrated marker-free transgenic cells supported a similar developmental competence of SCNT embryos compared with that of non-transgenic cells. After embryo transfer, antibiotic selectable marker free transgenic cattle were generated and anti-bacterial recombinant human β-defensin-3 in milk was detected during their lactation period. Thus, this approach offers a rapid and safe alternative to produce antibiotic selectable marker free transgenic farm animals, thereby making it a valuable tool to promote the healthy development and welfare of transgenic farm animals.
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Affiliation(s)
- Yuan Yu
- Key Laboratory of Animal Biotechnology of the Ministry of Agriculture, College of Veterinary Medicine, Northwest A&F University, Yangling, Shaanxi, People’s Republic of China
| | - Yongsheng Wang
- Key Laboratory of Animal Biotechnology of the Ministry of Agriculture, College of Veterinary Medicine, Northwest A&F University, Yangling, Shaanxi, People’s Republic of China
| | - Qi Tong
- Key Laboratory of Animal Biotechnology of the Ministry of Agriculture, College of Veterinary Medicine, Northwest A&F University, Yangling, Shaanxi, People’s Republic of China
| | - Xu Liu
- Key Laboratory of Animal Biotechnology of the Ministry of Agriculture, College of Veterinary Medicine, Northwest A&F University, Yangling, Shaanxi, People’s Republic of China
| | - Feng Su
- Key Laboratory of Animal Biotechnology of the Ministry of Agriculture, College of Veterinary Medicine, Northwest A&F University, Yangling, Shaanxi, People’s Republic of China
| | - Fusheng Quan
- Key Laboratory of Animal Biotechnology of the Ministry of Agriculture, College of Veterinary Medicine, Northwest A&F University, Yangling, Shaanxi, People’s Republic of China
| | - Zekun Guo
- Key Laboratory of Animal Biotechnology of the Ministry of Agriculture, College of Veterinary Medicine, Northwest A&F University, Yangling, Shaanxi, People’s Republic of China
| | - Yong Zhang
- Key Laboratory of Animal Biotechnology of the Ministry of Agriculture, College of Veterinary Medicine, Northwest A&F University, Yangling, Shaanxi, People’s Republic of China
- * E-mail:
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Yau YY, Stewart CN. Less is more: strategies to remove marker genes from transgenic plants. BMC Biotechnol 2013; 13:36. [PMID: 23617583 PMCID: PMC3689633 DOI: 10.1186/1472-6750-13-36] [Citation(s) in RCA: 88] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2012] [Accepted: 03/05/2013] [Indexed: 02/07/2023] Open
Abstract
Selectable marker genes (SMGs) and selection agents are useful tools in the production of transgenic plants by selecting transformed cells from a matrix consisting of mostly untransformed cells. Most SMGs express protein products that confer antibiotic- or herbicide resistance traits, and typically reside in the end product of genetically-modified (GM) plants. The presence of these genes in GM plants, and subsequently in food, feed and the environment, are of concern and subject to special government regulation in many countries. The presence of SMGs in GM plants might also, in some cases, result in a metabolic burden for the host plants. Their use also prevents the re-use of the same SMG when a second transformation scheme is needed to be performed on the transgenic host. In recent years, several strategies have been developed to remove SMGs from GM products while retaining the transgenes of interest. This review describes the existing strategies for SMG removal, including the implementation of site specific recombination systems, TALENs and ZFNs. This review discusses the advantages and disadvantages of existing SMG-removal strategies and explores possible future research directions for SMG removal including emerging technologies for increased precision for genome modification.
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Affiliation(s)
- Yuan-Yeu Yau
- Department of Natural Sciences, Northeastern State University, Broken Arrow, OK 74014, USA
| | - C Neal Stewart
- Department of Plant Sciences, University of Tennessee, Knoxville, TN 37996, USA
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PL1 fusion gene: a novel visual selectable marker gene that confers tolerance to multiple abiotic stresses in transgenic tomato. Transgenic Res 2013; 21:1057-70. [PMID: 22315138 DOI: 10.1007/s11248-012-9592-4] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2011] [Accepted: 01/19/2012] [Indexed: 01/29/2023]
Abstract
Visual selectable markers, including the purple color caused by the accumulation of anthocyanins, have been proposed for use as antibiotic-free alternatives. However, the excessive accumulation of anthocyanins seriously inhibits the growth and development of transgenic plants. In our study, the AtDWF4 promoter from Arabidopsis and the tomato LeANT1 gene, encoding a MYB transcription factor, were used to construct the PL1 fusion gene to test whether it could be used as a visual selectable marker gene for tomato transformation. All the PL1 transgenic shoots exhibited intense purple color on shoot induction medium. In the transgenic tomato plants, PL1 was highly expressed in the cotyledons, but expressed only slightly in the true leaves and other organs. The expression of PL1 had no significantly adverse effects on the growth or development of the transgenic tomato plants, and conferred tolerance to multiple abiotic stresses in them. With the “cut off green shoots” method, multiple independent 35S::GFP transgenic tomato lines were successfully obtained using PL1 as the selectable marker gene. These results suggest that PL1 has potential application of visual selectable marker gene for tomato transformation.
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Tuteja N, Verma S, Sahoo RK, Raveendar S, Reddy INBL. Recent advances in development of marker-free transgenic plants: Regulation and biosafety concern. J Biosci 2012; 37:167-97. [PMID: 22357214 DOI: 10.1007/s12038-012-9187-5] [Citation(s) in RCA: 103] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Narendra Tuteja
- International Centre for Genetic Engineering and Biotechnology, Aruna Asaf Ali Marg, New Delhi 110 067, India.
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Suitability of non-lethal marker and marker-free systems for development of transgenic crop plants: Present status and future prospects. Biotechnol Adv 2011; 29:703-14. [DOI: 10.1016/j.biotechadv.2011.05.019] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2010] [Revised: 05/30/2011] [Accepted: 05/31/2011] [Indexed: 12/16/2022]
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Wang AX, Chen XL. [Current status and industrialization of transgenic tomatoes]. YI CHUAN = HEREDITAS 2011; 33:962-974. [PMID: 21951797 DOI: 10.3724/sp.j.1005.2011.00962] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
In this review, the progress in transgenic tomato research, including disease and insect resistance, herbicide resistance, stress tolerance, long-term storage, quality improvement, and male sterility, were described. The recent researches on producing heterologous proteins using transgenic tomatoes were also reviewed. Furthermore, the industrialization status and problems of transgenic tomatoes were analyzed and the prospects of both research and industrialization in transgenic tomatoes were discussed.
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Affiliation(s)
- Ao-Xue Wang
- Northeast Agricultural University, College of Horticulture, Harbin 150030, China.
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Khan RS, Nakamura I, Mii M. Development of disease-resistant marker-free tomato by R/RS site-specific recombination. PLANT CELL REPORTS 2011; 30:1041-1053. [PMID: 21293863 DOI: 10.1007/s00299-011-1011-4] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/14/2010] [Revised: 01/11/2011] [Accepted: 01/11/2011] [Indexed: 05/30/2023]
Abstract
The selection marker genes, imparting antibiotic or herbicide resistance, in the final transgenics have been criticized by the public and considered a hindrance in their commercialization. Multi-auto-transformation (MAT) vector system has been one of the strategies to produce marker-free transgenic plants without using selective chemicals and plant growth regulators (PGRs). In the study reported here, isopentenyltransferase (ipt) gene was used as a selection marker and wasabi defensin (WD) gene, isolated from Wasabia japonica as a target gene. WD was cloned from the binary vector, pEKH-WD to an ipt-type MAT vector, pMAT21 by gateway cloning and transferred to Agrobacterium tumefaciens strain EHA105. Infected cotyledons of tomato cv. Reiyo were cultured on PGR- and antibiotic-free MS medium. Adventitious shoots were developed by the explants infected with the pMAT21/wasabi defensin. The same PGR- and antibiotic-free MS medium was used in subcultures of the adventitious shoot lines (ASLs) to produce ipt and normal shoots. Approximately, 6 months after infection morphologically normal shoots were produced. Molecular analyses of the developed shoots confirmed the integration of gene of interest (WD) and excision of the selection marker (ipt). Expression of WD was confirmed by Northern blot and Western blot analyses. The marker-free transgenic plants exhibited enhanced resistance against Botrytis cinerea (gray mold), Alternaria solani (early blight), Fusarium oxysporum (Fusarium wilt) and Erysiphe lycopersici (powdery mildew).
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Affiliation(s)
- Raham Sher Khan
- Laboratory of Plant Cell Technology, Graduate School of Horticulture, Chiba University, 648 Matsudo, Matsudo, Chiba 271-8510, Japan.
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Khan RS, Ntui VO, Chin DP, Nakamura I, Mii M. Production of marker-free disease-resistant potato using isopentenyl transferase gene as a positive selection marker. PLANT CELL REPORTS 2011; 30:587-97. [PMID: 21184230 DOI: 10.1007/s00299-010-0974-x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/15/2010] [Revised: 11/17/2010] [Accepted: 12/05/2010] [Indexed: 05/10/2023]
Abstract
The use of antibiotic or herbicide resistant genes as selection markers for production of transgenic plants and their continuous presence in the final transgenics has been a serious problem for their public acceptance and commercialization. MAT (multi-auto-transformation) vector system has been one of the different strategies to excise the selection marker gene and produce marker-free transgenic plants. In the present study, ipt (isopentenyl transferase) gene was used as a selection marker gene. A chitinase gene, ChiC (isolated from Streptomyces griseus strain HUT 6037) was used as a gene of interest. ChiC gene was cloned from the binary vector, pEKH1 to an ipt-type MAT vector, pMAT21 by gateway cloning and transferred to Agrobacterium tumefaciens strain EHA105. The infected tuber discs of potato were cultured on hormone- and antibiotic-free MS medium. Seven of the 35 explants infected with the pMAT21/ChiC produced shoots. The same antibiotic- and hormones-free MS medium was used in subcultures of the shoots (ipt like and normal shoots). Molecular analyses of genomic DNA from transgenic plants confirmed the integration of gene of interest and excision of the selection marker in 3 of the 7 clones. Expression of ChiC gene was confirmed by Northern blot and western blot analyses. Disease-resistant assay of the marker-free transgenic, in vitro and greenhouse-grown plants exhibited enhanced resistance against Alternaria solani (early blight), Botrytis cinerea (gray mold) and Fusarium oxysporum (Fusarium wilt). From these results it could be concluded that ipt gene can be used as a selection marker to produce marker-free disease-resistant transgenic potato plants on PGR- and antibiotic-free MS medium.
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Affiliation(s)
- Raham Sher Khan
- Laboratory of Plant Cell Technology, Graduate School of Horticulture, Chiba University, 648 Matsudo, Matsudo, Chiba 271-8510, Japan.
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16
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Ostash B. Site-specific recombinases in genetic engineering: Modern in vivo technologies. CYTOL GENET+ 2010. [DOI: 10.3103/s0095452710040109] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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17
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Song GQ, Sink KC, Ma Y, Herlache T, Hancock JF, Loescher WH. A novel mannose-based selection system for plant transformation using celery mannose-6-phosphate reductase gene. PLANT CELL REPORTS 2010; 29:163-72. [PMID: 20033814 DOI: 10.1007/s00299-009-0809-9] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/06/2009] [Revised: 12/07/2009] [Accepted: 12/08/2009] [Indexed: 05/28/2023]
Abstract
To investigate its potential application as a selectable marker for plant transformation, the mannitol producing, celery mannose-6-phosphate reductase gene (M6PR) was transformed into Arabidopsis and tobacco using Agrobacterium tumefaciens-mediated transformation. Mannose-tolerance assays in transgenic materials revealed that the M6PR can act as a selectable marker gene in either a positive or a negative selection mode depending on the plant species. For mannose sensitive species, such as Arabidopsis, expression of M6PR enhanced mannose tolerance and provided a positive selection for transgenic seeds. On medium containing 2 g/L mannose, transgenic seeds germinated, whereas wild type (WT) seeds did not. For mannose-tolerant species, expression of M6PR increased mannose sensitivity in tobacco and enabled a negative selection for transgenic leaves and seeds. Mannose at 30 g/L blanched leaf explants from all 29 transgenic tobacco events with M6PR. In contrast, 30 g/L mannose did not inhibit shoot regeneration from leaf explants of WT or transgenic plants with either an antisense M6PR or a plasmid control. Similarly, mannose at 30 g/L inhibited seed germination of transgenic tobacco seeds with M6PR but not that of WT or transgenic tobacco with either the antisense M6PR or the plasmid control. Northern blot confirmed transcripts of the M6PR in transgenic tobacco, and accumulation of mannitol verified activity of the M6PR in tobacco leaves. Either positive or negative selection using the celery M6PR is versatile for plant transformation. Additionally, the celery M6PR is a potential target gene for improving salt-tolerance in plants due to mannitol accumulation.
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Affiliation(s)
- Guo-Qing Song
- Plant Biotechnology Resource and Outreach Center, Department of Horticulture, Michigan State University, East Lansing, MI 48824, USA
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Li B, Li N, Duan X, Wei A, Yang A, Zhang J. Generation of marker-free transgenic maize with improved salt tolerance using the FLP/FRT recombination system. J Biotechnol 2009; 145:206-13. [PMID: 19932138 DOI: 10.1016/j.jbiotec.2009.11.010] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2009] [Revised: 10/13/2009] [Accepted: 11/12/2009] [Indexed: 01/31/2023]
Abstract
The possible release of selectable marker genes from genetically modified transgenic plants, or of gut microbes, to the environment, has raised worldwide public concerns. In this study, we showed the generation of marker-free transgenic maize plants constitutively expressing AtNHX1, a Na(+)/H(+) antiporter gene from Arabidopsis that conferred salt tolerance on plants, using the FLP/FRT site-specific recombination system. Transgenic plant expressing a modified FLP recombinase gene was crossed with transgenic plant harboring AtNHX1 and mutant als, a selectable marker gene flanked by two directed FRT sites. The sexual crossing led to precise and complete excision of the FRT-surrounded als marker gene in the F1 progenies. Further salt tolerance examinations indicated that marker-free AtNHX1 transgenic plants accumulated more Na(+) and K(+), and produced greater biomass and yields than did the wild-type plants when grown in high saline fields. These results demonstrate the feasibility of using this FLP/FRT-based marker elimination system to generate marker-free transgenic important cereal crops with improved salt tolerance.
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Affiliation(s)
- Bei Li
- School of Life Science, Shandong University, 27 Shanda South Road, Jinan 250100, PR China
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