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Cao X, Dong Z, Tian D, Dong L, Qian W, Liu J, Liu X, Qin H, Zhai W, Gao C, Zhang K, Wang D. Development and characterization of marker-free and transgene insertion site-defined transgenic wheat with improved grain storability and fatty acid content. PLANT BIOTECHNOLOGY JOURNAL 2020; 18:129-140. [PMID: 31141279 PMCID: PMC6920130 DOI: 10.1111/pbi.13178] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/01/2019] [Revised: 05/09/2019] [Accepted: 05/20/2019] [Indexed: 05/24/2023]
Abstract
Development of marker-free and transgene insertion site-defined (MFTID) transgenic plants is essential for safe application of transgenic crops. However, MFTID plants have not been reported for wheat (Triticum aestivum). Here, we prepared a RNAi cassette for suppressing lipoxygenase (LOX) gene expression in wheat grains using a double right border T-DNA vector. The resultant construct was introduced into wheat genome via Agrobacterium-mediated transformation, with four homozygous marker-free transgenic lines (namely GLRW-1, -3, -5 and -8) developed. Aided by the newly published wheat genome sequence, the T-DNA insertion sites in GLRW-3 and GLRW-8 were elucidated at base-pair resolution. While the T-DNA in GLRW-3 inserted in an intergenic region, that of GLRW-8 inactivated an endogenous gene, which was thus excluded from further analysis. Compared to wild -type (WT) control, GLRW-1, -3 and -5 showed decreased LOX gene expression, lower LOX activity and less lipid peroxidation in the grains; they also exhibited significantly higher germination rates and better seedling growth after artificial ageing treatment. Interestingly, the three GLRW lines also had substantially increased contents of several fatty acids (e.g., linoleic acid and linolenic acid) in their grain and flour samples than WT control. Collectively, our data suggest that suppression of grain LOX activity can be employed to improve the storability and fatty acid content of wheat seeds and that the MFTID line GLRW-3 is likely of commercial value. Our approach may also be useful for developing the MFTID transgenic lines of other crops with enhanced grain storability and fatty acid content.
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Affiliation(s)
- Xuemin Cao
- State Key Laboratory of Plant Cell and Chromosome EngineeringInstitute of Genetics and Developmental BiologyChinese Academy of SciencesBeijingChina
- University of Chinese Academy of SciencesBeijingChina
| | - Zhenying Dong
- State Key Laboratory of Plant Cell and Chromosome EngineeringInstitute of Genetics and Developmental BiologyChinese Academy of SciencesBeijingChina
| | - Dong Tian
- State Key Laboratory of Plant Cell and Chromosome EngineeringInstitute of Genetics and Developmental BiologyChinese Academy of SciencesBeijingChina
- University of Chinese Academy of SciencesBeijingChina
| | - Lingli Dong
- State Key Laboratory of Plant Cell and Chromosome EngineeringInstitute of Genetics and Developmental BiologyChinese Academy of SciencesBeijingChina
| | - Weiqiang Qian
- State Key Laboratory of Plant Cell and Chromosome EngineeringInstitute of Genetics and Developmental BiologyChinese Academy of SciencesBeijingChina
| | - Jinxing Liu
- State Key Laboratory of Plant Cell and Chromosome EngineeringInstitute of Genetics and Developmental BiologyChinese Academy of SciencesBeijingChina
| | - Xin Liu
- State Key Laboratory of Plant Cell and Chromosome EngineeringInstitute of Genetics and Developmental BiologyChinese Academy of SciencesBeijingChina
| | - Huanju Qin
- State Key Laboratory of Plant Cell and Chromosome EngineeringInstitute of Genetics and Developmental BiologyChinese Academy of SciencesBeijingChina
| | - Wenxue Zhai
- State Key Laboratory of Plant Cell and Chromosome EngineeringInstitute of Genetics and Developmental BiologyChinese Academy of SciencesBeijingChina
| | - Caixia Gao
- State Key Laboratory of Plant Cell and Chromosome EngineeringInstitute of Genetics and Developmental BiologyChinese Academy of SciencesBeijingChina
- University of Chinese Academy of SciencesBeijingChina
| | - Kunpu Zhang
- State Key Laboratory of Plant Cell and Chromosome EngineeringInstitute of Genetics and Developmental BiologyChinese Academy of SciencesBeijingChina
- College of Agronomy and State Key Laboratory of Wheat and Maize Crop ScienceHenan Agricultural UniversityZhengzhouChina
| | - Daowen Wang
- State Key Laboratory of Plant Cell and Chromosome EngineeringInstitute of Genetics and Developmental BiologyChinese Academy of SciencesBeijingChina
- University of Chinese Academy of SciencesBeijingChina
- College of Agronomy and State Key Laboratory of Wheat and Maize Crop ScienceHenan Agricultural UniversityZhengzhouChina
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Hu W, Lagarias JC. A Tightly Regulated Genetic Selection System with Signaling-Active Alleles of Phytochrome B. PLANT PHYSIOLOGY 2017; 173:366-375. [PMID: 27881727 PMCID: PMC5210734 DOI: 10.1104/pp.16.01345] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/25/2016] [Accepted: 11/22/2016] [Indexed: 06/01/2023]
Abstract
Selectable markers derived from plant genes circumvent the potential risk of antibiotic/herbicide-resistance gene transfer into neighboring plant species, endophytic bacteria, and mycorrhizal fungi. Toward this goal, we have engineered and validated signaling-active alleles of phytochrome B (eYHB) as plant-derived selection marker genes in the model plant Arabidopsis (Arabidopsis thaliana). By probing the relationship of construct size and induction conditions to optimal phenotypic selection, we show that eYHB-based alleles are robust substitutes for antibiotic/herbicide-dependent marker genes as well as surprisingly sensitive reporters of off-target transgene expression.
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Affiliation(s)
- Wei Hu
- Department of Molecular and Cellular Biology, University of California, Davis, California 95776
| | - J Clark Lagarias
- Department of Molecular and Cellular Biology, University of California, Davis, California 95776
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Wang GP, Yu XD, Sun YW, Jones HD, Xia LQ. Generation of Marker- and/or Backbone-Free Transgenic Wheat Plants via Agrobacterium-Mediated Transformation. FRONTIERS IN PLANT SCIENCE 2016; 7:1324. [PMID: 27708648 PMCID: PMC5030305 DOI: 10.3389/fpls.2016.01324] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/30/2016] [Accepted: 08/18/2016] [Indexed: 05/18/2023]
Abstract
Horizontal transfer of antibiotic resistance genes to animals and vertical transfer of herbicide resistance genes to the weedy relatives are perceived as major biosafety concerns in genetically modified (GM) crops. In this study, five novel vectors which used gusA and bar as a reporter gene and a selection marker gene, respectively, were constructed based on the pCLEAN dual binary vector system. Among these vectors, 1G7B and 5G7B carried two T-DNAs located on two respective plasmids with 5G7B possessing an additional virGwt gene. 5LBTG154 and 5TGTB154 carried two T-DNAs in the target plasmid with either one or double right borders, and 5BTG154 carried the selectable marker gene on the backbone outside of the T-DNA left border in the target plasmid. In addition, 5BTG154, 5LBTG154, and 5TGTB154 used pAL154 as a helper plasmid which contains Komari fragment to facilitate transformation. These five dual binary vector combinations were transformed into Agrobacterium strain AGL1 and used to transform durum wheat cv Stewart 63. Evaluation of the co-transformation efficiencies, the frequencies of marker-free transgenic plants, and integration of backbone sequences in the obtained transgenic lines indicated that two vectors (5G7B and 5TGTB154) were more efficient in generating marker-free transgenic wheat plants with no or minimal integration of backbone sequences in the wheat genome. The vector series developed in this study for generation of marker- and/or backbone-free transgenic wheat plants via Agrobacterium-mediated transformation will be useful to facilitate the creation of "clean" GM wheat containing only the foreign genes of agronomic importance.
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Affiliation(s)
- Gen-Ping Wang
- Department of Plant Gene Resources and Molecular Design, Institute of Crop Sciences, Chinese Academy of Agricultural Sciences (CAAS)Beijing, China
- Cereal Crops Research Laboratory of Hebei Province, National Millet Improvement Center, Institute of Millet Crops, Hebei Academy of Agriculture and Forestry SciencesShijiazhuang, China
| | - Xiu-Dao Yu
- Department of Plant Gene Resources and Molecular Design, Institute of Crop Sciences, Chinese Academy of Agricultural Sciences (CAAS)Beijing, China
| | - Yong-Wei Sun
- Department of Plant Gene Resources and Molecular Design, Institute of Crop Sciences, Chinese Academy of Agricultural Sciences (CAAS)Beijing, China
| | - Huw D. Jones
- Translational Genomics for Plant Breeding, Institute of Biological, Environmental and Rural Sciences, Aberystwyth UniversityAberystwyth, UK
| | - Lan-Qin Xia
- Department of Plant Gene Resources and Molecular Design, Institute of Crop Sciences, Chinese Academy of Agricultural Sciences (CAAS)Beijing, China
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Guo WC, Wang ZA, Luo XL, Jin X, Chang J, He J, Tu EX, Tian YC, Si HJ, Wu JH. Development of selectable marker-free transgenic potato plants expressing cry3A against the Colorado potato beetle (Leptinotarsa decemlineata Say). PEST MANAGEMENT SCIENCE 2016; 72:497-504. [PMID: 25820984 DOI: 10.1002/ps.4013] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/11/2014] [Revised: 03/11/2015] [Accepted: 03/23/2015] [Indexed: 06/04/2023]
Abstract
BACKGROUND Elimination of selectable marker genes (SMGs) is important for the safe assessment and commercial use of transgenic plants. The destructive and invasive Colorado potato beetle (CPB) poses a serious threat to potato production. In response to this need, selectable marker-free transgenic potato lines expressing cry3A were developed to control the damage and spread of CPB. RESULTS We simultaneously introduced cry3A and npt II genes harboured in different plasmids into the potato genome using the Agrobacterium-mediated cotransformation method. Four selectable marker-free transgenic potato (CT) lines expressing cry3A were developed by self-crossing segregation and molecular analyses, including Southern blot, western blot and enzyme-linked immunosorbent assay (ELISA) assays. CT lines were used in a resistance bioassay against CPB in the laboratory and field. In the laboratory, CT lines exhibited high resistance to CPB, and 100% mortality of first-instar larvae occurred 6 days after infestation. In the field, untransformed plant leaves were almost entirely consumed, with an average of 155 larvae present per plant 25 days after inoculation. However, CT lines showed no damage symptoms, with approximately 2.5 larvae surviving per plant. CONCLUSION We successfully eliminated SMGs from the transgenic potato lines expressing cry3A in order to decrease CPB damage, control the spread of this pest eastwards and alleviate the concern regarding the safe assessment of regulatory requirements. © 2015 Society of Chemical Industry.
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Affiliation(s)
- Wen-chao Guo
- State Key Laboratory of Plant Genome, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China
- Institute of Plant Protection, Xinjiang Agricultural Academy of Sciences, Xinjiang, Urumqi, China
| | - Zhi-an Wang
- State Key Laboratory of Plant Genome, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China
- Institute of Cotton Research, Shanxi Agricultural Academy of Sciences, Shanxi, Yuncheng, China
| | - Xiao-li Luo
- Institute of Cotton Research, Shanxi Agricultural Academy of Sciences, Shanxi, Yuncheng, China
| | - Xin Jin
- State Key Laboratory of Plant Genome, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China
- College of Biology Science and Technology, Gansu Agricultural University, Gansu, Lanzhou, China
| | - Jing Chang
- State Key Laboratory of Plant Genome, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China
- College of Biology Science and Technology, Gansu Agricultural University, Gansu, Lanzhou, China
| | - Jiang He
- Institute of Plant Protection, Xinjiang Agricultural Academy of Sciences, Xinjiang, Urumqi, China
| | - Er-xun Tu
- Institute of Plant Protection, Xinjiang Agricultural Academy of Sciences, Xinjiang, Urumqi, China
| | - Ying-chuan Tian
- State Key Laboratory of Plant Genome, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China
| | - Huai-jun Si
- College of Biology Science and Technology, Gansu Agricultural University, Gansu, Lanzhou, China
| | - Jia-he Wu
- State Key Laboratory of Plant Genome, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China
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Ling F, Zhou F, Chen H, Lin Y. Development of Marker-Free Insect-Resistant Indica Rice by Agrobacterium tumefaciens-Mediated Co-transformation. FRONTIERS IN PLANT SCIENCE 2016; 7:1608. [PMID: 27833629 PMCID: PMC5081342 DOI: 10.3389/fpls.2016.01608] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/18/2016] [Accepted: 10/12/2016] [Indexed: 05/21/2023]
Abstract
Agrobacterium-mediated co-transformation is an efficient strategy to generate marker-free transgenic plants. In this study, the vectors pMF-2A∗ containing a synthetic cry2A∗ gene driven by maize ubiquitin promoter and pCAMBIA1301 harboring hygromycin phosphotransferase gene (hpt) were introduced into Minghui86 (Oryza sativa L. ssp. indica), an elite indica restorer line. Two independent transformants containing both the cry2A∗ gene and hpt gene were regenerated. Several homozygous marker-free transgenic progenies were derived from family 2AH2, and three of them were selected for further insect bioassay in the laboratory and field. Insect-resistance assays revealed that all the three transgenic lines were highly resistant to striped stem borer (Chilo suppressalis), yellow stem borer (Tryporyza incertulas) and rice leaf folder (Cnaphalocrocis medinalis). The measurement of Cry2A protein concentration showed that Cry2A protein was stably expressed in leaves and stems of homozygous transgenic lines and their hybrids. The yields of the marker-free homozygous transgenic lines and their hybrids were not significantly different from those of their corresponding controls. Furthermore, the results of flanking sequence isolation showed that the T-DNA in line 8-30 was integrated into the intergenic region of chromosome 2 (between Os02g43680 and Os02g43690). These results indicate that the marker-free transgenic rice has the potential for commercial production.
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Chang Y, Shen E, Wen L, Yu J, Zhu D, Zhao Q. Seed-Specific Expression of the Arabidopsis AtMAP18 Gene Increases both Lysine and Total Protein Content in Maize. PLoS One 2015; 10:e0142952. [PMID: 26580206 PMCID: PMC4651559 DOI: 10.1371/journal.pone.0142952] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2015] [Accepted: 10/28/2015] [Indexed: 11/30/2022] Open
Abstract
Lysine is the most limiting essential amino acid for animal nutrition in maize grains. Expression of naturally lysine-rich protein genes can increase the lysine and protein contents in maize seeds. AtMAP18 from Arabidopsis thaliana encoding a microtubule-associated protein with high-lysine content was introduced into the maize genome with the seed-specific promoter F128. The protein and lysine contents of different transgenic offspring were increased prominently in the six continuous generations investigated. Expression of AtMAP18 increased both zein and non-zein protein in the transgenic endosperm. Compared with the wild type, more protein bodies were observed in the endosperm of transgenic maize. These results implied that, as a cytoskeleton binding protein, AtMAP18 facilitated the formation of protein bodies, which led to accumulation of both zein and non-zein proteins in the transgenic maize grains. Furthermore, F1 hybrid lines with high lysine, high protein and excellent agronomic traits were obtained by hybridizing T6 transgenic offspring with other wild type inbred lines. This article provides evidence supporting the use of cytoskeleton-associated proteins to improve the nutritional value of maize.
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Affiliation(s)
- Yujie Chang
- State Key Laboratory of Agricultural Biotechnology, College of Biological Sciences, China Agricultural University, Beijing, China
| | - Erli Shen
- State Key Laboratory of Agricultural Biotechnology, College of Biological Sciences, China Agricultural University, Beijing, China
| | - Liuying Wen
- State Key Laboratory of Agricultural Biotechnology, College of Biological Sciences, China Agricultural University, Beijing, China
| | - Jingjuan Yu
- State Key Laboratory of Agricultural Biotechnology, College of Biological Sciences, China Agricultural University, Beijing, China
| | - Dengyun Zhu
- State Key Laboratory of Agricultural Biotechnology, College of Biological Sciences, China Agricultural University, Beijing, China
| | - Qian Zhao
- State Key Laboratory of Agricultural Biotechnology, College of Biological Sciences, China Agricultural University, Beijing, China
- * E-mail:
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