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Wei R, Zhang W, Li C, Hao Z, Huang D, Zhang W, Pan X. Establishment of Agrobacterium-mediated transformation system to Juglans sigillata Dode 'Qianhe-7'. Transgenic Res 2023; 32:193-207. [PMID: 37118332 DOI: 10.1007/s11248-023-00348-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2022] [Accepted: 04/04/2023] [Indexed: 04/30/2023]
Abstract
An efficient genetic transformation system is of great significance for verifying gene function and improving plant breeding efficiency by gene engineering. In this study, a stable Agrobacterium mediated genetic transformation system of Juglans sigillata Dode 'Qianhe-7' was investigated using callus and negative pressure-assisted and ultrasonic-assisted transformation selection. The results showed that the axillary shoot leaves were suitable to induce callus and the callus proliferation rate could reach 516.27% when induction calli were cultured on DKW medium containing 0.5 mg L-1 indole-3-butyric acid, 1.2 mg L-1 2,4-dichlorophenoxyacetic acid and 0.5 mg L-1 kinetin for 18 d. In addition, negative pressure infection was the optimal infection method with the lowest browning rate (0.00%), high GFP conversion rate (16.67%), and better growth status. To further prove the feasibility of this genetic transformation system, the flavonol synthetase (JsFLS5) gene was successfully transformed into the into leaf-derived callus of 'Qianhe-7'. JsFLS5 expression and the content of total flavonoids in transformed callus were improved significantly compared with the untransformed callus, which proved that we had an efficient and reliable genetic transformation system using leaf-derived callus of Juglans sigillata.
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Affiliation(s)
- Rong Wei
- Guizhou Engineering Research Center for Fruit Crops, Guizhou University, Guiyang, China
- College of Agricultural, Guizhou University, Guiyang, 550025, China
| | - Wen'e Zhang
- College of Agricultural, Guizhou University, Guiyang, 550025, China
| | - Chunxiang Li
- Guizhou Engineering Research Center for Fruit Crops, Guizhou University, Guiyang, China
- College of Agricultural, Guizhou University, Guiyang, 550025, China
| | - Zhenkun Hao
- Guizhou Engineering Research Center for Fruit Crops, Guizhou University, Guiyang, China
- College of Agricultural, Guizhou University, Guiyang, 550025, China
| | - Dong Huang
- Guizhou Engineering Research Center for Fruit Crops, Guizhou University, Guiyang, China
- College of Agricultural, Guizhou University, Guiyang, 550025, China
| | - Wenlong Zhang
- Guizhou Engineering Research Center for Fruit Crops, Guizhou University, Guiyang, China
- College of Agricultural, Guizhou University, Guiyang, 550025, China
| | - Xuejun Pan
- Guizhou Engineering Research Center for Fruit Crops, Guizhou University, Guiyang, China.
- College of Agricultural, Guizhou University, Guiyang, 550025, China.
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Cai YM, Dudley QM, Patron NJ. Measurement of Transgene Copy Number in Plants Using Droplet Digital PCR. Bio Protoc 2021; 11:e4075. [PMID: 34327272 PMCID: PMC8292117 DOI: 10.21769/bioprotoc.4075] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2020] [Revised: 03/25/2021] [Accepted: 03/30/2021] [Indexed: 11/02/2022] Open
Abstract
Transgenic plants are produced both to investigate gene function and to confer desirable traits into crops. Transgene copy number is known to influence expression levels, and consequently, phenotypes. Similarly, knowledge of transgene zygosity is desirable for making quantitative assessments of phenotype and tracking the inheritance of transgenes in progeny generations. Since the first transgenic plants were produced, several methods for determining copy number have been applied, including Southern blotting, quantitative real-time PCR, and more recently, sequencing methods; however, each method has specific disadvantages, compromising throughput, accuracy, or expense. Digital PCR (dPCR) divides reactions into partitions, converting the exponential, analogue nature of PCR into a linear, digital signal that allows the frequency of occurrence of specific sequences to be accurately estimated. Confidence increases with the number of partitions; therefore, the availability of emulsion technologies that enable reactions to be divided into tens of thousands of nanodroplets allows accurate determination of copy number in what has become known as digital droplet PCR (ddPCR). ddPCR offers similar benefits of low costs and scalability as other PCR techniques but with superior accuracy and reliability. Graphic abstract: Digital PCR (dPCR) divides reactions into partitions, converting the exponential, analogue nature of PCR into a linear, digital signal that allows the frequency of transgene copy number to be accurately assessed.
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Affiliation(s)
- Yao-Min Cai
- Earlham Institute, Norwich Research Park, Colney lane, Norwich, UK
| | | | - Nicola J. Patron
- Earlham Institute, Norwich Research Park, Colney lane, Norwich, UK
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Zhong H, Elumalai S, Nalapalli S, Richbourg L, Prairie A, Bradley D, Dong S, Su XJ, Gu W, Strebe T, Shi L, Que Q. Advances in Agrobacterium-mediated Maize Transformation. Methods Mol Biol 2018; 1676:41-59. [PMID: 28986903 DOI: 10.1007/978-1-4939-7315-6_3] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
One of the major limitations of maize transformation is the isolation of a large number of immature embryos using the time-consuming manual extraction method. In this article, we describe a novel bulk embryo extraction method for fast isolation of a large number of embryos suitable for both biolistic- and Agrobacterium-mediated transformation. Optimal gene delivery and tissue culture conditions are also described for achieving high efficiency in Agrobacterium-mediated maize transformation using phosphomannose isomerase (PMI) as a selectable marker.
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Affiliation(s)
- Heng Zhong
- Syngenta Crop Protection, LLC, 9 Davis Drive, Research Triangle Park, Durham, NC, 27709, USA
| | - Sivamani Elumalai
- Syngenta Crop Protection, LLC, 9 Davis Drive, Research Triangle Park, Durham, NC, 27709, USA
| | - Samson Nalapalli
- Syngenta Crop Protection, LLC, 9 Davis Drive, Research Triangle Park, Durham, NC, 27709, USA
| | - Lee Richbourg
- Syngenta Crop Protection, LLC, 9 Davis Drive, Research Triangle Park, Durham, NC, 27709, USA
| | - Anna Prairie
- Syngenta Crop Protection, LLC, 9 Davis Drive, Research Triangle Park, Durham, NC, 27709, USA
| | - David Bradley
- Syngenta Crop Protection, LLC, 9 Davis Drive, Research Triangle Park, Durham, NC, 27709, USA
| | - Shujie Dong
- Syngenta Crop Protection, LLC, 9 Davis Drive, Research Triangle Park, Durham, NC, 27709, USA
| | - Xiujuan Jenny Su
- Syngenta Crop Protection, LLC, 9 Davis Drive, Research Triangle Park, Durham, NC, 27709, USA
| | - Weining Gu
- Syngenta Crop Protection, LLC, 9 Davis Drive, Research Triangle Park, Durham, NC, 27709, USA
| | - Tim Strebe
- Syngenta Crop Protection, LLC, 9 Davis Drive, Research Triangle Park, Durham, NC, 27709, USA
| | - Liang Shi
- Syngenta Crop Protection, LLC, 9 Davis Drive, Research Triangle Park, Durham, NC, 27709, USA
| | - Qiudeng Que
- Syngenta Crop Protection, LLC, 9 Davis Drive, Research Triangle Park, Durham, NC, 27709, USA.
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Abstract
Agrobacterium strains transfer a single-strand form of T-DNA (T-strands) and Virulence (Vir) effector proteins to plant cells. Following transfer, T-strands likely form complexes with Vir and plant proteins that traffic through the cytoplasm and enter the nucleus. T-strands may subsequently randomly integrate into plant chromosomes and permanently express encoded transgenes, a process known as stable transformation. The molecular processes by which T-strands integrate into the host genome remain unknown. Although integration resembles DNA repair processes, the requirement of known DNA repair pathways for integration is controversial. The configuration and genomic position of integrated T-DNA molecules likely affect transgene expression, and control of integration is consequently important for basic research and agricultural biotechnology applications. This article reviews our current knowledge of the process of T-DNA integration and proposes ways in which this knowledge may be manipulated for genome editing and synthetic biology purposes.
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Affiliation(s)
- Stanton B Gelvin
- Department of Biological Sciences, Purdue University, West Lafayette, Indiana 47907-1392, USA;
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