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Zhou X, Dong Y, Zhang Q, Xiao D, Yang M, Wang J. Expression of Multiple Exogenous Insect Resistance and Salt Tolerance Genes in Populus nigra L. FRONTIERS IN PLANT SCIENCE 2020; 11:1123. [PMID: 32793270 PMCID: PMC7393212 DOI: 10.3389/fpls.2020.01123] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/28/2020] [Accepted: 07/07/2020] [Indexed: 05/02/2023]
Abstract
Four exogenous genes, Cry3A, Cry1Ac, mtlD, and BADH, were inserted into the p1870 vector to obtain multigenic transgenic Populus nigra L. with improved insect resistance and salt tolerance. During vector construction, different promoters were used for each gene, the AtADH 5'-UTR enhancer was added between the Cry1Ac promoter and the target gene, and the matrix attachment region (MAR, GenBank: U67919.1) structure was added at both ends of the vector. It was then successfully transferred into the genome of European black poplar by Agrobacterium-mediated leaf disk transformation, and a total of 28 transgenic lines were obtained by kanamycin screening. Five events with the highest insect resistance were selected based on preliminary tests: nos. 1, 7, 9, 12, and 17. PCR, real-time PCR, and enzyme-linked immunosorbent assays (ELISA) were used to detect the expression of exogenous genes and to analyze the Bt protein toxin levels in transgenic lines from June to October. PCR results showed that all four genes were successfully introduced into the five selected lines. Fluorescence quantitative PCR showed no significant differences in the transcript abundance of the four exogenous genes between different lines. A Bt protein toxin assay showed that the Cry3A protein toxin content was significantly higher than the Cry1Ac protein toxin content by approximately three orders of magnitude. Levels of the two toxins were negatively correlated. Over the course of the growing season, Cry1Ac content raised and varied between 0.46 and 18.41 ng·g-1. Cry3A content decreased over the same time period and varied between 2642.75 and 15775.22 ng·g-1. Indoor insect feeding assay showed that the transgenic lines had high insect resistance, with mortality rates of 1-2-year-old Hyphantria cunea larvae reaching more than 80%, and those of Plagiodera versicolora larvae and nymphs reaching 100%. No. 17 and no. 12 lines had better insect resistance to Lepidoptera and Coleoptera pests. There was no clear improvement in salt tolerance of the transgenic lines, but comprehensive evaluation of 11 salt tolerance indicators showed that lines no. 17 and no. 7 had certain degrees of salt tolerance.
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Affiliation(s)
- Xinglu Zhou
- Institute of Forest Biotechnology, Forestry College, Agricultural University of Hebei, Baoding, China
- Hebei Key Laboratory for Tree Genetic Resources and Forest Protection, Baoding, China
| | - Yan Dong
- Institute of Forest Biotechnology, Forestry College, Agricultural University of Hebei, Baoding, China
- Hebei Key Laboratory for Tree Genetic Resources and Forest Protection, Baoding, China
| | - Qi Zhang
- Institute of Forest Biotechnology, Forestry College, Agricultural University of Hebei, Baoding, China
- Hebei Key Laboratory for Tree Genetic Resources and Forest Protection, Baoding, China
| | - Dandan Xiao
- Institute of Forest Biotechnology, Forestry College, Agricultural University of Hebei, Baoding, China
- Institute of Coastal Agriculture, Hebei Academy of Agriculture and Forestry Sciences, Shijiazhuang, China
| | - Minsheng Yang
- Institute of Forest Biotechnology, Forestry College, Agricultural University of Hebei, Baoding, China
- Hebei Key Laboratory for Tree Genetic Resources and Forest Protection, Baoding, China
| | - Jinmao Wang
- Institute of Forest Biotechnology, Forestry College, Agricultural University of Hebei, Baoding, China
- Hebei Key Laboratory for Tree Genetic Resources and Forest Protection, Baoding, China
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Yang L, Cui G, Wang Y, Hao Y, Du J, Zhang H, Wang C, Zhang H, Wu SB, Sun Y. Expression of Foreign Genes Demonstrates the Effectiveness of Pollen-Mediated Transformation in Zea mays. FRONTIERS IN PLANT SCIENCE 2017; 8:383. [PMID: 28377783 PMCID: PMC5359326 DOI: 10.3389/fpls.2017.00383] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/22/2016] [Accepted: 03/06/2017] [Indexed: 05/05/2023]
Abstract
Plant genetic transformation has arguably been the core of plant improvement in recent decades. Efforts have been made to develop in planta transformation systems due to the limitations present in the tissue-culture-based methods. Herein, we report an improved in planta transformation system, and provide the evidence of reporter gene expression in pollen tube, embryos and stable transgenicity of the plants following pollen-mediated plant transformation with optimized sonication treatment of pollen. The results showed that the aeration at 4°C treatment of pollen grains in sucrose prior to sonication significantly improved the pollen viability leading to improved kernel set and transformation efficiency. Scanning electron microscopy observation revealed that the removal of operculum covering pollen pore by ultrasonication might be one of the reasons for the pollen grains to become competent for transformation. Evidences have shown that the eGfp gene was expressed in the pollen tube and embryos, and the Cry1Ac gene was detected in the subsequent T1 and T2 progenies, suggesting the successful transfer of the foreign genes to the recipient plants. The Southern blot analysis of Cry1Ac gene in T2 progenies and PCR-identified Apr gene segregation in T2 seedlings confirmed the stable inheritance of the transgene. The outcome illustrated that the pollen-mediated genetic transformation system can be widely applied in the plant improvement programs with apparent advantages over tissue-culture-based transformation methods.
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Affiliation(s)
- Liyan Yang
- Biotechnology Research Center, Shanxi Academy of Agricultural SciencesTaiyuan, China
- College of Life Science, Shanxi Normal UniversityLinfen, China
| | - Guimei Cui
- Biotechnology Research Center, Shanxi Academy of Agricultural SciencesTaiyuan, China
| | - Yixue Wang
- Biotechnology Research Center, Shanxi Academy of Agricultural SciencesTaiyuan, China
| | - Yaoshan Hao
- Biotechnology Research Center, Shanxi Academy of Agricultural SciencesTaiyuan, China
| | - Jianzhong Du
- Biotechnology Research Center, Shanxi Academy of Agricultural SciencesTaiyuan, China
| | - Hongmei Zhang
- Maize Research Institute, Shanxi Academy of Agricultural SciencesTaiyuan, China
| | - Changbiao Wang
- Biotechnology Research Center, Shanxi Academy of Agricultural SciencesTaiyuan, China
| | - Huanhuan Zhang
- Biotechnology Research Center, Shanxi Academy of Agricultural SciencesTaiyuan, China
| | - Shu-Biao Wu
- Biotechnology Research Center, Shanxi Academy of Agricultural SciencesTaiyuan, China
- School of Environmental and Rural Science, University of New England, ArmidaleNSW, Australia
- *Correspondence: Yi Sun, Shu-Biao Wu,
| | - Yi Sun
- Biotechnology Research Center, Shanxi Academy of Agricultural SciencesTaiyuan, China
- Key Laboratory of Crop Gene Resources and Germplasm Enhancement on Loess Plateau, Ministry of AgricultureTaiyuan, China
- *Correspondence: Yi Sun, Shu-Biao Wu,
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Zhao C, Jurat-Fuentes JL, Abdelgaffar HM, Pan H, Song F, Zhang J. Identification of a New cry1I-Type Gene as a Candidate for Gene Pyramiding in Corn To Control Ostrinia Species Larvae. Appl Environ Microbiol 2015; 81:3699-705. [PMID: 25795679 PMCID: PMC4421046 DOI: 10.1128/aem.00379-15] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2015] [Accepted: 03/17/2015] [Indexed: 11/20/2022] Open
Abstract
Pyramiding of diverse cry toxin genes from Bacillus thuringiensis with different modes of action is a desirable strategy to delay the evolution of resistance in the European corn borer (Ostrinia nubilalis). Considering the dependency of susceptibility to Cry toxins on toxin binding to receptors in the midgut of target pests, a diverse mode of action is commonly defined as recognition of unique binding sites in the target insect. In this study, we present a novel cry1Ie toxin gene (cry1Ie2) as a candidate for pyramiding with Cry1Ab or Cry1Fa in corn to control Ostrinia species larvae. The new toxin gene encodes an 81-kDa protein that is processed to a protease-resistant core form of approximately 55 kDa by trypsin digestion. The purified protoxin displayed high toxicity to Ostrinia furnacalis and O. nubilalis larvae but low to no activity against Spodoptera or heliothine species or the coleopteran Tenebrio molitor. Results of binding assays with (125)I-labeled Cry1Ab toxin and brush border membrane vesicles from O. nubilalis larvae demonstrated that Cry1Ie2 does not recognize the Cry1Ab binding sites in that insect. Reciprocal competition binding assays with biotin-labeled Cry1Ie2 confirmed the lack of shared sites with Cry1Ab or Cry1Fa in O. nubilalis brush border membrane vesicles. These data support Cry1Ie2 as a good candidate for pyramiding with Cry1Ab or Cry1Fa in corn to increase the control of O. nubilalis and reduce the risk of resistance evolution.
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Affiliation(s)
- Can Zhao
- College of Plant Science, Jilin University, Changchun, Jilin, China State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Juan Luis Jurat-Fuentes
- Department of Entomology and Plant Pathology, University of Tennessee, Knoxville, Tennessee, USA
| | - Heba M Abdelgaffar
- Department of Entomology and Plant Pathology, University of Tennessee, Knoxville, Tennessee, USA
| | - Hongyu Pan
- College of Plant Science, Jilin University, Changchun, Jilin, China
| | - Fuping Song
- State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Jie Zhang
- State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, China
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