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Lei CY, Gou YN, Wu N, Liu FY, Deng JX. First report of leaf blight caused by Stemphylium lycopersici on Salvia splendens in China. Plant Dis 2024. [PMID: 38587799 DOI: 10.1094/pdis-12-23-2667-pdn] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/09/2024]
Abstract
Salvia splendens is a popular ornamental plant in China with extensive potentials, including value in traditional Chinese medicine and in environmental restoration function (Li et al. 2008). In September 2019, leaf blight disease was observed on road side plants of S. splendens in Bayi park, Nanchang city, Jiangxi province, China. The typical symptoms appeared as irregular necrotic spots or leaf blight, accompanied by extensive scorch necrosis or ultimately defoliation. Small segments cut from diseased leaves were surface sterilized in a 2% sodium hypochlorite solution for 2 min and rinsed three times with sterile distilled water. Then, the samples were placed on potato dextrose agar (PDA) plates incubated at 25°C in darkness. Pure cultures were obtained by the hyphal tip method. Morphologically, all 11 colonies were identical to each other on PDA. Two strains, YZU 191468 and YZU 191481, were selected for further study and deposited in the Fungal Herbarium of Yangtze University (YZU), Jingzhou, Hubei, China. The 7-day-old colonies were circular, 53 to 56 mm in diameter, and consisted of white mycelium with a buff margin, and were cinnamon colored in the center of the reverse side. To examine conidial morphology, the mycelium was transferred onto potato carrot agar (PCA) and incubated at 23°C with a period of 8 h light/16 h dark for 7 days. Conidia were normally solitary or two in a chain, ellipsoid or long ellipsoid, beakless, 10 to 23×30 to 60 µm in size (n=50). Based on morphology, the isolates were consistent with Stemphylium lycopersici (Yamamoto 1960). To confirm the identification, genomic DNA was extracted from both isolates and used to amplify the internal transcribed spacer rDNA region (ITS), glyceraldehydes-3-phosphate dehydrogenase (GAPDH) and calmodulin (CAL) genes with primer pairs ITS5/ITS4, gpd1/gpd2, and CALDF1/CALDR2, respectively (Woudenberg et al. 2017). Sequences were deposited in GenBank with accession numbers OP564983 and OP564984 (ITS), OP892529 and OP892530 (GAPDH), OP584970 and OP584971 (CAL). A neighbor-joining tree was constructed with Mega 7.0 based on the combined dataset with 1,000 bootstrap replicates. The resulting phylogenetic tree showed that the strains from S. splendens clustered with S. lycopersici (CBS 122639 and CBS 124980) supported with 100% bootstrap values. The molecular analyses confirmed that the species causing leaf blight symptoms was S. lycopersici. To test pathogenicity, healthy leaves of S. splendens were surface sterilized and inoculated by mycelium blocks (6 mm in diameter) and spore suspension (1×106 spore/mL) of representative strains YZU 191468 and YZU 191481, respectively. Controls were inoculated with blocks of PDA and sterile water. Each strain was inoculated on three leaves of a plant. One clean plant was used as control. The test was replicated three times. After inoculation, the plants were covered with plastic bags and incubated in a greenhouse (25℃, 80 % relative humidity, 8 h light/16 h dark). After 5 days, the inoculated leaves exhibited dark brown spots with white mycelium, followed by withering of necrotic tissues. There were no symptoms observed on the controls. The fungal isolates inoculated leaves had the same morphological characteristics as the strains used for inoculation. S. lycopersici has been found on eggplant and Zinnia elegans in China (He et al. 2019; Yang et al. 2017). To the best of our knowledge, this is the first report of S. lycopersici causing leaf blight on S. splendens in China. This finding offers a new reference for the management and control of S. splendens leaf diseases in China.
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Affiliation(s)
- Cui-Yu Lei
- College of Agriculture, Yangtze University, Jingzhou 434025, Hubei, China, Hubei, China;
| | - Ya-Nan Gou
- Department of Plant Protection, College of Agriculture, Yangtze University, Jingzhou 434025, Hubei, China, Jingzhou, Hubei , China;
| | - Na Wu
- Department of Plant Pathology, College of Plant Protection, Nanjing Agricultural University, and Key Laboratory of Integrated Management of Crop Diseases and Pests, Ministry of Education, Nanjing 210095, China., Najing, Jiangsu, China;
| | - Feng Yin Liu
- Department of Plant Pathology, College of Plant Protection, Nanjing Agricultural University, and Key Laboratory of Integrated Management of Crop Diseases and Pests, Ministry of Education, Nanjing 210095, China., Jingzhou, China;
| | - Jian-Xin Deng
- Department of Plant Protection, College of Agriculture, Yangtze University, Jingzhou 434025, ChinaJingzhou, China, 434025;
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Guo ZJ, Cai LT, Gou YN, Huang CX, Deng JX, Wang HC. First Report of Tobacco Leaf Tip Blight Caused by Alternaria gossypina in China. Plant Dis 2024. [PMID: 38568844 DOI: 10.1094/pdis-01-24-0171-pdn] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/05/2024]
Abstract
Tobacco (Nicotiana tabacum L.) belongs to the family Solanaceae, an economically significant crop (Zhou et al. 2023). Twelve samples with leaf spots were collected in Keti Village, Changshun County, Zunyi City, Guizhou province, China in 2022. Twenty-five percent of the samples had dry lesions near the leaf tip which resulted leaf tip blight after development. Fungi were isolated by a previous method (Wei et al. 2022). Six Alternaria strains were obtained and preserved in the Fungal Herbarium of Yangtze University (YZU), Jingzhou, Hubei, China. Among them, one strain YZU 221477 showed distinct cultural characteristics out of five A. alternata strains, which was again determined by growing on potato dextrose agar (PDA) at 25°C for 7 days in dark to evaluate. The colonies (60 mm in diameter) were white cottony in the center surrounded by vinaceous purple. To examine the morphology, mycelia were inoculated onto potato carrot agar (PCA) at 22°C, following an 8 h light/16 h dark photoperiod (Simmons 2007). Conidia were obclavate or ovoid, normally 3-5 conidial units per chain, 20-38 × 10-16.5 μm, 3 to 5 transverse septa, beakless or a short beak (4-30 μm). The observation results were consistent with those of A. gossypina (Zhang 2003). Total genomic DNA was extracted using the CTAB method and seven gene regions including internal transcribed spacer of rDNA (ITS), glyceraldehyde-3-phosphate dehydrogenase (GAPDH), translation elongation factor 1 alpha (TEF1), RNA polymerase second largest subunit (RPB2), Alternaria major allergen gene (Alt a 1), endopolygalacturonase (EndoPG) and an anonymous gene region (OPA10-2) were amplified with ITS5/ITS4, gpd1/gpd2, EF1-728F/EF1-986R, RPB2-5F/RPB2-7cR, Alt-for/Alt-rev, PG3/PG2b and OPA10-2L/OPA10-2R primers, respectively. All sequences were deposited in GenBank (ITS: OR710806; GAPDH: PP057862; TEF1: PP158601; RPB2: PP057863; Alt a 1: PP057865; EndoPG: PP057861; OPA10-2: PP057864). Combining with relevant sequences retrieved from the NCBI database were used for the phylogenetic analysis. Maximum Likelihood (ML) tree was constructed with RAxML v.7.2.8 employing GTRCAT model using 1000 bootstrap (BS) replicates to assess statistical support. The results indicated that the present strain grouped with A. gossypina (type strain of CBS 104.32) supported with 73% bootstrap values, also having a support of 0.83 Bayesian posterior probabilities values. Based on morphology and molecular evidence, the strain YZU 221477 is identified as Alternaria gossypina. Pathogenicity was examined to fulfill Koch's postulates. Mycelial plugs (6 mm diameter) of the present strain and A. alternata cultivated on PDA were taken from the margin and inoculated onto viable tobacco leaves (Cultivar: Yunyan 87, n=3) growing forty days, while controls were inoculated with sterile PDA. The assay was conducted three times. The plants were maintained at 25°C with humidity levels over 85% in a greenhouse. Leaves were evaluated after 7 days, necrotic spots encircled by yellow halos were on both inoculums, except controls. Pathogen re-isolation confirmed that it was the same as inoculated fungus based on morphology. A. gossypina was firstly found on cotton (Hopkins 1931), late reported to induce disease on Minneola, Nopalea, Hibiscus, Citrus, Solanum and Ageratina. To our knowledge, this is the first report of A. gossypina causing tobacco leaf tip blight in China, and it also provides a basis for controlling of tobacco leaf tip blight.
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Affiliation(s)
- Zhuan-Jun Guo
- Department of Plant Protection, College of Agriculture, Yangtze University, Jingzhou, HuBei, China;
| | - Liu-Ti Cai
- Guizhou Academy of Tobacco Science, No. 29, Longtanba Road, Guanshanhu District, Guiyang, Guiyang, China, 550008
- China;
| | - Ya-Nan Gou
- Department of Plant Protection, College of Agriculture, Yangtze University, Jingzhou, Hubei , China;
| | - Cheng-Xin Huang
- Department of Plant Protection, College of Agriculture, Yangtze University, Jingzhou, Hubei , China;
| | - Jian-Xin Deng
- Department of Plant Protection, College of Agriculture, Yangtze University, Jingzhou 434025, ChinaJingzhou, China, 434025;
| | - Han-Cheng Wang
- Plant protection, Plant disease, Nanjing Agricultrual University, Nanjing, Jiangsu, China, 210095
- Guizhou Academy of Tobacco Science, Plant Pathology, Longtan Ba Road #29, Guan Shan Hu District, Guiyang, Guiyang, Guizhou, China, 550081;
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Zhang X, Chen X, Cao JP, Wang HW, Deng WY, Yang LH, Lin K, Li Q, Li QH, Cao YL, Deng JX, Miao J. Ultra-high resistive switching current ratio and improved ferroelectricity and dielectric tunability performance in a BaTiO 3/La 0.7Sr 0.3MnO 3 heterostructure by inserting a SrCoO 2.5 layer. Nanoscale 2024; 16:3081-3090. [PMID: 38240724 DOI: 10.1039/d3nr04591a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/09/2024]
Abstract
A BaTiO3/SrCoO2.5 (BTO/SCO) bilayer and a BTO single film were prepared by radio frequency magnetron sputtering on La0.7Sr0.3MnO3 (LSMO) buffered SrTiO3 (001) substrates. Interestingly, compared with reported BTO-based films, the BTO/SCO/LSMO heterostructure has a maximum ON/OFF current ratio of ∼945. More interestingly, compared with the BTO single layer, a larger Pr (∼18.4 μC cm-2) and larger dielectric tunability (∼71.9%) were achieved in the BTO/SCO bilayer. The improved performance may be attributed to the large tetragonality and improved oxygen vacancy concentrations in the BTO/SCO/LSMO heterostructure. Furthermore, our BTO/SCO/LSMO stacks exhibit potential for flexible electronic informational devices.
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Affiliation(s)
- Xi Zhang
- School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China.
- Institute of Solid State Chemistry, University of Science and Technology Beijing, Beijing 100083, China.
| | - Xin Chen
- Institute of Solid State Chemistry, University of Science and Technology Beijing, Beijing 100083, China.
| | - J P Cao
- School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China.
- Institute of Solid State Chemistry, University of Science and Technology Beijing, Beijing 100083, China.
| | - H W Wang
- School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China.
- Institute of Solid State Chemistry, University of Science and Technology Beijing, Beijing 100083, China.
| | - W Y Deng
- School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China.
- Institute of Solid State Chemistry, University of Science and Technology Beijing, Beijing 100083, China.
| | - L H Yang
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - K Lin
- Institute of Solid State Chemistry, University of Science and Technology Beijing, Beijing 100083, China.
| | - Q Li
- Institute of Solid State Chemistry, University of Science and Technology Beijing, Beijing 100083, China.
| | - Q H Li
- Institute of Solid State Chemistry, University of Science and Technology Beijing, Beijing 100083, China.
| | - Y L Cao
- Institute of Solid State Chemistry, University of Science and Technology Beijing, Beijing 100083, China.
| | - J X Deng
- Institute of Solid State Chemistry, University of Science and Technology Beijing, Beijing 100083, China.
| | - Jun Miao
- School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China.
- Institute of Solid State Chemistry, University of Science and Technology Beijing, Beijing 100083, China.
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Zhao L, Wei X, Zheng T, Gou YN, Wang J, Deng JX, Li MJ. Evaluation of Pathogenic Fusarium spp. Associated with Soybean Seed ( Glycine max) in Hubei Province, China. Plant Dis 2022; 106:3178-3186. [PMID: 35522955 DOI: 10.1094/pdis-12-21-2793-re] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Soybean (Glycine max L.) seeds showing serious symptoms from rotted pods were collected from fields during the harvesting period (July to August 2020) in Taihu Farm, Jingzhou City, Hubei Province, China. Fusarium strains were frequently encountered during fungal isolation. According to the morphology and prepathogenicity tests, six strains showing variable effects on the seeds were selected for identification based on morphology and multilocus phylogenetic analysis of the internal transcribed spacer (ITS) region of the ribosomal DNA, translation elongation factor (EF-1α), calmodulin (CAM), β-tubulin (TUB), and partial RNA polymerase second largest subunit (RPB2), and to evaluate the pathogenic abilities on seed, root, and pod. The results indicated that the strains contained two species (Fusarium fujikuroi and F. proliferatum) in the Fusarium fujikuroi species complex (FFSC) and two species (F. luffae and F. sulawense) from the Fusarium incarnatum-equiseti species complex (FIESC). The two species of FFSC were more aggressive than those of FIESC on soybean seed, root, and pod. Among the strains, F. proliferatum YZU 201408 exhibited the most pathogenicity on all tests, with 72.2 to 90% disease severity.
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Affiliation(s)
- Lin Zhao
- Department of Plant Protection, College of Agriculture, Yangtze University, Jingzhou 434025, China
| | - Xin Wei
- Department of Plant Protection, College of Agriculture, Yangtze University, Jingzhou 434025, China
| | - Tao Zheng
- Department of Plant Protection, College of Agriculture, Yangtze University, Jingzhou 434025, China
| | - Ya-Nan Gou
- Department of Plant Protection, College of Agriculture, Yangtze University, Jingzhou 434025, China
| | - Jun Wang
- Department of Agriculture, College of Agriculture, Yangtze University, Jingzhou 434025, China
| | - Jian-Xin Deng
- Department of Plant Protection, College of Agriculture, Yangtze University, Jingzhou 434025, China
| | - Mei-Jia Li
- Institute of Special Wild Economic Animals and Plants, Chinese Academy of Agricultural Sciences, Changchun 130112, China
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Gou YN, Aung SLL, Htun AA, Huang CX, Deng JX. Alternaria species in section Alternaria associated with Iris plants in China. Front Microbiol 2022; 13:1036950. [PMID: 36338033 PMCID: PMC9635052 DOI: 10.3389/fmicb.2022.1036950] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2022] [Accepted: 10/03/2022] [Indexed: 11/13/2022] Open
Abstract
Plants of the Iris genus have been widely cultivated because of their medicinal, ornamental, and economic values. It commonly suffers from Alternaria leaf spot or blight disease leading to considerable losses for their commercial values. During an investigation of 14 provinces or municipalities of China from 2014 to 2022, a total of 122 Alternaria strains in section Alternaria were obtained from diseased leaves of Iris spp.. Among them, 12 representative strains were selected and identified based on morphological characterization and multi-locus phylogenetic analysis, which encompassed the internal transcribed spacer of rDNA region (ITS), glyceraldehyde-3-phosphate dehydrogenase (GAPDH), translation elongation factor 1 alpha (TEF1), RNA polymerase second largest subunit (RPB2), Alternaria major allergen gene (Alt a 1), an anonymous gene region (OPA10-2), and endopolygalacturonase gene (EndoPG). The strains comprised two known species of A. alternata and A. iridicola, and two new species of A. setosae and A. tectorum, which were described and illustrated here. Their pathogenicity evaluated on Iris setosa indicated that all the strains could induce typical Alternaria leaf spot or blight symptoms. The results showed that the virulence was variable among those four species, from which A. tectorum sp. nov. was the most virulent one, followed by A. setosae sp. nov., A. iridicola and A. alternata.
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Affiliation(s)
- Ya-Nan Gou
- Department of Plant Protection, College of Agriculture, Yangtze University, Jingzhou, China
| | - Sein Lai Lai Aung
- Department of Plant Protection, College of Agriculture, Yangtze University, Jingzhou, China
| | - Aye Aye Htun
- National Key Laboratory of Wheat and Maize Crop Science, Agronomy College, Henan Agricultural University, Zhengzhou, China
| | - Cheng-Xin Huang
- Department of Plant Protection, College of Agriculture, Yangtze University, Jingzhou, China
| | - Jian-Xin Deng
- Department of Plant Protection, College of Agriculture, Yangtze University, Jingzhou, China
- *Correspondence: Jian-Xin Deng,
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Zheng T, Zhao L, Huang MG, Deng JX, Wang YH. First Report of Leaf Spot Caused by Nigrospora hainanensis on Oxalis corymbosa in China. Plant Dis 2022; 106:PDIS10212149PDN. [PMID: 34907808 DOI: 10.1094/pdis-10-21-2149-pdn] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Affiliation(s)
- Tao Zheng
- Department of Plant Protection, College of Agriculture, Yangtze University, Jingzhou 434025, China
| | - Lin Zhao
- Department of Plant Protection, College of Agriculture, Yangtze University, Jingzhou 434025, China
| | - Meng-Ge Huang
- Guangxi Key Laboratory of Biology for Crop Diseases and Insect Pests, Plant Protection Research Institute, Guangxi Academy of Agricultural Sciences, Nangning 530007, China
| | - Jian-Xin Deng
- Department of Plant Protection, College of Agriculture, Yangtze University, Jingzhou 434025, China
| | - Yan-Hui Wang
- Guangxi Key Laboratory of Biology for Crop Diseases and Insect Pests, Plant Protection Research Institute, Guangxi Academy of Agricultural Sciences, Nangning 530007, China
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Zhao L, Luo H, Cheng H, Gou YN, Yu ZH, Deng JX. New Species of Large-Spored Alternaria in Section Porri Associated with Compositae Plants in China. J Fungi (Basel) 2022; 8:jof8060607. [PMID: 35736091 PMCID: PMC9225545 DOI: 10.3390/jof8060607] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2022] [Revised: 06/02/2022] [Accepted: 06/03/2022] [Indexed: 11/16/2022] Open
Abstract
Alternaria is a ubiquitous fungal genus including saprobic, endophytic, and pathogenic species associated with a wide variety of substrates. It has been separated into 29 sections and seven monotypic lineages based on molecular and morphological data. Alternaria sect. Porri is the largest section, containing the majority of large-spored Alternaria species, most of which are important plant pathogens. Since 2015, of the investigations for large-spored Alternaria species in China, 13 species were found associated with Compositae plants based on morphological comparisons and phylogenetic analyses. There were eight known species and five new species (A. anhuiensis sp. nov., A. coreopsidis sp. nov., A. nanningensis sp. nov., A. neimengguensis sp. nov., and A. sulphureus sp. nov.) distributed in the four sections of Helianthiinficientes, Porri, Sonchi, and Teretispora, and one monotypic lineage (A. argyranthemi). The multi-locus sequence analyses encompassing the internal transcribed spacer region of rDNA (ITS), glyceraldehydes-3-phosphate dehydrogenase (GAPDH), Alternaria major allergen gene (Alt a 1), translation elongation factor 1-alpha (TEF1), and RNA polymerase second largest subunit (RPB2), revealed that the new species fell into sect. Porri. Morphologically, the new species were illustrated and compared with other relevant large-spored Alternaria species in the study. Furthermore, A. calendulae, A. leucanthemi, and A. tagetica were firstly detected in Brachyactis ciliate, Carthamus tinctorius, and Calendula officinalis in China, respectively.
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Affiliation(s)
- Lin Zhao
- Department of Plant Protection, College of Agriculture, Yangtze University, Jingzhou 434025, China; (L.Z.); (H.C.); (Y.-N.G.)
| | - Huan Luo
- Department of Applied Biology, Chungnam National University, Daejeon 34134, Korea;
| | - Hong Cheng
- Department of Plant Protection, College of Agriculture, Yangtze University, Jingzhou 434025, China; (L.Z.); (H.C.); (Y.-N.G.)
| | - Ya-Nan Gou
- Department of Plant Protection, College of Agriculture, Yangtze University, Jingzhou 434025, China; (L.Z.); (H.C.); (Y.-N.G.)
| | - Zhi-He Yu
- Department of Biology, College of Life Sciences, Yangtze University, Jingzhou 434025, China;
| | - Jian-Xin Deng
- Department of Plant Protection, College of Agriculture, Yangtze University, Jingzhou 434025, China; (L.Z.); (H.C.); (Y.-N.G.)
- Correspondence:
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Xu KX, Shan XN, Ruan Y, Deng J, Wang L. Three new Penicillium species isolated from the tidal flats of China. PeerJ 2022; 10:e13224. [PMID: 35547185 PMCID: PMC9083529 DOI: 10.7717/peerj.13224] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2021] [Accepted: 03/14/2022] [Indexed: 01/12/2023] Open
Abstract
During a survey of culturable fungi in the coastal areas of China, three new species of Penicillium sect. Lanata-Divaricata were discovered and studied with a polyphasic taxonomic approach, and then named as P. donggangicum sp. nov. (ex-type AS3.15900T = LN5H1-4), P. hepuense sp. nov. (ex-type AS3.16039T = TT2-4X3, AS3.16040 = TT2-6X3) and P. jiaozhouwanicum sp. nov. (ex-type AS3.16038T = 0801H2-2, AS3.16207 = ZZ2-9-3). In morphology, P. donggangicum is unique in showing light yellow sclerotia and mycelium, sparse sporulation, restricted growth at 37 °C, irregular conidiophores, intercalary phialides and metulae, and pyriform to subspherical conidia. P. hepuense is distinguished by the fast growth on CYA and YES and slow growth on MEA at 25 °C, weak or absence of growth at 37 °C, biverticillate and monoverticillate penicilli, and ellipsoidal conidia. P. jiaozhouwanicum is characterized by abundant grayish-green conidia en masse and moderate growth at 37 °C, the appressed biverticillate penicilli and fusiform, smooth-walled conidia. These three novelties were further confirmed by the phylogenetic analyses based on either the combined BenA-CaM-Rpb2 or the individual BenA, CaM, Rpb2 and internal transcribed spacer (ITS) sequences.
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Affiliation(s)
- Ke-Xin Xu
- College of Agriculture, Yangtze University, Jingzhou, Hubei, China
| | - Xia-Nan Shan
- College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhua, Zhejiang, China
| | - Yongming Ruan
- College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhua, Zhejiang, China
| | - JianXin Deng
- College of Agriculture, Yangtze University, Jingzhou, Hubei, China
| | - Long Wang
- State Key Laboratory of Mycology, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China
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Cheng S, Jiang JW, Tan LT, Deng JX, Liang PY, Su H, Sun ZX, Zhou Y. Plant Growth-Promoting Ability of Mycorrhizal Fusarium Strain KB-3 Enhanced by Its IAA Producing Endohyphal Bacterium, Klebsiella aerogenes. Front Microbiol 2022; 13:855399. [PMID: 35495715 PMCID: PMC9051524 DOI: 10.3389/fmicb.2022.855399] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2022] [Accepted: 03/15/2022] [Indexed: 11/29/2022] Open
Abstract
Fusarium oxysporum KB-3 had been reported as a mycorrhizal fungus of Bletilla striata, which can promote the seed germination and vegetative growth. Endohyphal bacteria were demonstrated in the hyphae of the KB-3 by 16S rDNA PCR amplification and SYTO-9 fluorescent nucleic acid staining. A strain Klebsiella aerogenes KE-1 was isolated and identified based on the multilocus sequence analysis. The endohyphal bacterium was successfully removed from the wild strain KB-3 (KB-3−), and GFP-labeled KE-1 was also transferred to the cured strain KB-3− (KB-3+). The production of indole-3-acetic acid (IAA) in the culturing broths of strains of KE-1, KB-3, KB-3−, and KB-3+ was examined by HPLC. Their IAA productions were estimated using Salkowski colorimetric technique. The highest concentrations of IAA were 76.9 (at 48 h after inoculation), 31.4, 9.6, and 19.4 μg/ml (at 60 h after inoculation), respectively. Similarly, the three fungal cultural broths exhibited plant promoting abilities on the tomato root and stem growth. The results indicated that the ability of mycorrhizal Fusarium strain KB-3 to promote plant growth was enhanced because its endohyphal bacterium, Klebsiella aerogenes KE-1, produced a certain amount of IAA.
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Chen QM, Deng JX, Zeng X. [Development and chinization of diagnostic criteria for oral lichen planus]. Zhonghua Kou Qiang Yi Xue Za Zhi 2020; 55:191-195. [PMID: 32193918 DOI: 10.3760/cma.j.issn.1002-0098.2020.03.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Oral lichen planus (OLP) is a common chronic inflammatory disease of oral mucosa. The diagnostic criteria of OLP is the cornerstone of clinical diagnosis and treatment and scientific research. However, there are various understandings of the diagnostic criteria in China. Thus several questions need to be answered, for example, how to combine the international diagnostic criteria with China's specific conditions, how to apply the criteria into clinical practice, and how to use the criteria guiding clinical work and scientific research in China. The authors of this article systematically introduced and discussed the development, content and difference of the international diagnostic criteria of OLP. We proposed "23 Princeples" for the selection of biopsy indications in OLP diagnosis based on authors' personal experiences in clinical and basic research and the actual conditions of Chinese clinicians. We also express our own views and suggestions about some other hot issues associated with OLP diagnosis.
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Affiliation(s)
- Q M Chen
- Department of Oral Mucosa, West China Hospital of Stomatology, Sichuan University & State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases, Chengdu 610041, China
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Luo H, Jia GG, Ma DF, Sun ZX, Deng JX. First Report of Leaf Spot Disease Caused by Alternaria jacinthicola on Tagetes erecta in China. Plant Dis 2018; 102:PDIS01180182PDN. [PMID: 30145955 DOI: 10.1094/pdis-01-18-0182-pdn] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Affiliation(s)
- H Luo
- Department of Plant Protection, College of Agriculture, Yangtze University, Jingzhou 434025, China
| | - G G Jia
- Department of Plant Protection, College of Agriculture, Yangtze University, Jingzhou 434025, China
| | - D F Ma
- Department of Plant Protection, College of Agriculture, Yangtze University, Jingzhou 434025, China
| | - Z X Sun
- Department of Plant Protection, College of Agriculture, Yangtze University, Jingzhou 434025, China
| | - J X Deng
- Department of Plant Protection, College of Agriculture, Yangtze University, Jingzhou 434025, China
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12
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Yue Y, Deng JX, Huang GL, Huang JH, Xu Y, Gao X, Guo L, Li PS, Wu H, Lu CY. Gender difference in the association between childhood trauma and depression in Chinese adolescents. Eur J Public Health 2016. [DOI: 10.1093/eurpub/ckw167.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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13
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Li J, Shelford LR, Shafer P, Tan A, Deng JX, Keatley PS, Hwang C, Arenholz E, van der Laan G, Hicken RJ, Qiu ZQ. Direct Detection of Pure ac Spin Current by X-Ray Pump-Probe Measurements. Phys Rev Lett 2016; 117:076602. [PMID: 27563981 DOI: 10.1103/physrevlett.117.076602] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2015] [Indexed: 06/06/2023]
Abstract
Despite recent progress in spin-current research, the detection of spin current has mostly remained indirect. By synchronizing a microwave waveform with synchrotron x-ray pulses, we use the ferromagnetic resonance of the Py (Ni_{81}Fe_{19}) layer in a Py/Cu/Cu_{75}Mn_{25}/Cu/Co multilayer to pump a pure ac spin current into the Cu_{75}Mn_{25} and Co layers, and then directly probe the spin current within the Cu_{75}Mn_{25} layer and the spin dynamics of the Co layer by x-ray magnetic circular dichroism. This element-resolved pump-probe measurement unambiguously identifies the ac spin current in the Cu_{75}Mn_{25} layer.
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Affiliation(s)
- J Li
- International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, China
- Department of Physics, University of California at Berkeley, Berkeley, California 94720, USA
| | - L R Shelford
- Department of Physics and Astronomy, University of Exeter, Stocker Road, Exeter, Devon EX4 4QL, United Kingdom
| | - P Shafer
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - A Tan
- Department of Physics, University of California at Berkeley, Berkeley, California 94720, USA
| | - J X Deng
- Department of Physics, University of California at Berkeley, Berkeley, California 94720, USA
| | - P S Keatley
- Department of Physics and Astronomy, University of Exeter, Stocker Road, Exeter, Devon EX4 4QL, United Kingdom
| | - C Hwang
- Korea Research Institute of Standards and Science, Yuseong, Daejeon 305-340, Republic of Korea
| | - E Arenholz
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - G van der Laan
- Magnetic Spectroscopy Group, Diamond Light Source, Didcot, Oxfordshire OX11 0DE, United Kingdom
| | - R J Hicken
- Department of Physics and Astronomy, University of Exeter, Stocker Road, Exeter, Devon EX4 4QL, United Kingdom
| | - Z Q Qiu
- Department of Physics, University of California at Berkeley, Berkeley, California 94720, USA
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14
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Ma S, Tan A, Deng JX, Li J, Zhang ZD, Hwang C, Qiu ZQ. Tailoring the magnetic anisotropy of Py/Ni bilayer films using well aligned atomic steps on Cu(001). Sci Rep 2015; 5:11055. [PMID: 26067408 PMCID: PMC4464147 DOI: 10.1038/srep11055] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2015] [Accepted: 05/11/2015] [Indexed: 11/09/2022] Open
Abstract
Tailoring the spin orientation at the atomic scale has been a key task in spintronics technology. While controlling the out-of-plane to in-plane spin orientation has been achieved by a precise control of the perpendicular magnetic anisotropy at atomic layer thickness level, a design and control of the in-plane magnetic anisotropy has not yet been well developed. On well aligned atomic steps of a 6° vicinal Cu(001) surface with steps parallel to the [110] axis, we grow Py/Ni overlayer films epitaxially to permit a systematic exploration of the step-induced in-plane magnetic anisotropy as a function of both the Py and the Ni film thicknesses. We found that the atomic steps from the vicinal Cu(001) induce an in-plane uniaxial magnetic anisotropy that favors both Py and Ni magnetizations perpendicular to the steps, opposite to the behavior of Co on vicinal Cu(001). In addition, thickness-dependent study shows that the Ni films exhibit different magnetic anisotropy below and above ~6 ML Ni thickness.
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Affiliation(s)
- S Ma
- 1] Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China [2] Department of Physics, University of California at Berkeley, Berkeley,California 94720
| | - A Tan
- Department of Physics, University of California at Berkeley, Berkeley,California 94720
| | - J X Deng
- Department of Physics, University of California at Berkeley, Berkeley,California 94720
| | - J Li
- Department of Physics, University of California at Berkeley, Berkeley,California 94720
| | - Z D Zhang
- Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
| | - C Hwang
- Korea Research Institute of Standards and Science, Yuseong, Daejeon 305-340, Korea
| | - Z Q Qiu
- Department of Physics, University of California at Berkeley, Berkeley,California 94720
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15
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Chi C, Xiang B, Deng JX, Lin HY, Natarajan K, Lin F, Liu HY, Freed DH, Arora RC, Tian GH. 286Cardioprotective potential of subcutaneous and visceral adipose-derived stem cells. Cardiovasc Res 2014. [DOI: 10.1093/cvr/cvu086.3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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16
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Chao C, Xiang B, Deng JX, Lin HY, Natarajan K, Lin F, Liu HY, Freed DH, Arora RC, Tian GH. P589Mediastinal adipose stem cells improve contractile function of failing hearts. Cardiovasc Res 2014. [DOI: 10.1093/cvr/cvu098.19] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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17
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Jin Z, Cai YP, Li DS, Deng JX, Shi J. [Developmental regulation of long term potentiation at layer II/III to II/III synapses of rat visual cortex]. Sheng Li Xue Bao 2009; 61:458-468. [PMID: 19847367] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
In the present research, patch-clamp whole-cell recording was used to study the developmental changes of the internal horizontal synaptic plasticity in layer II/III of rats' primary visual cortices. Pairing stimulation was used to induce long term potentiation (LTP) of neurons in layer II/III from layer II/III and layer IV. The data indicate that: (1) Responses of layer II/III neurons can be evoked independently at II/III-II/III and IV-II/III synapses by horizontal and vertical stimulations; (2) LTP can be induced from neurons in the layer II/III by horizontal tetanic stimulation at II/III-II/III synapses till postnatal day12 (P12, before eyes open); (3) Meanwhile, only short term potentiation (STP) at IV-II/III synapses can be induced by horizontal tetanic stimulation before eyes open; (4) After P12, a robust LTP at IV-II/III synapses can be induced by horizontal tetanic stimulation; (5) At P14, when vertical and horizontal tetanic stimulations were given to the same neuron, the LTP at IV-II/III synapses was weaker than that induced by vertical stimulation alone, suggesting that vertical synaptic modification was negatively regulated by horizontal inputs when two-direction synaptic inputs were presented at the same time; (6) Spontaneous responses of AMPA receptors (AMPARs) in the layer II/III neuron of rats' primary visual cortices are regulated by the development. The frequency of AMPARs-mediated postsynaptic currents was at a low level before eyes open, increased sharply at P12-P14, and slightly decreased after P18. And the amplitude of spontaneous AMPARs currents slowly decreased after P12. The results demonstrated that both the strength of horizontal synaptic modification and the effects of horizontal inputs on the vertical synaptic connection are regulated by the development. II/III-II/III synaptic communication has dual effects on the IV-II/III synapses, which may be involved in a competitive machinery of neural circuitry maturation and the formation of visual function columns.
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Affiliation(s)
- Zhou Jin
- Department of Physiology and Biophysics, School of Life Science, Fudan University, Shanghai 200433, China
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18
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Deng JX, Liu J. [Underlying mechanism for prolongation of action potential duration in ventricular cardiomyocytes of rats suffered from thermal injury]. Sheng Li Xue Bao 2007; 59:375-81. [PMID: 17579796] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
Severe thermal injury causes prolongation of action potential duration (APD) in cardiomyocytes, which results in cardiac dysfunction by inducing disturbance of calcium dyshomeostasis in cardiac myocytes. However, the underlying mechanism for APD prolongation remains unclear. In the present study, we examined the major action potential repolarization-related ion channel currents in rat ventricular cardiomyocytes, including transient outward potassium current (I(to)), inward rectifier potassium current (I(K1)) and L-type Ca(2+) current (I(Ca-L)) to investigate the alterations of these currents, which might account for the pathogenesis of APD prolongation induced by thermal injury. Twelve hours after approximately 40% of the total body surface area, full-thickness (third-degree) cutaneous thermal injury was produced in rats, ventricular cardiomyocytes were isolated from the hearts with systolic and diastolic dysfunction. APD was found to be markedly prolonged, while APD(50) and APD(90) in ventricular cardiomyocytes from rats with thermal injury were (46.02+/-3.78) ms and (123.24+/-12.48) ms (n=19), respectively, significantly longer than (23.28+/-4.85) ms and (72.12+/-3.57) ms (n=17, P<0.01) in ventricular cardiomyocytes from sham rats. Thermal injury remarkably suppressed Ito density in ventricular cardiomyocytes. Ito density at +60 mV was decreased from (34.15+/-3.78) pA/pF (n=20) in sham group to (20.39+/-1.98) pA/pF (n=25, P<0.01) in thermal injury group, and the decrease extended from -30 to +60 mV. Similarly, current densities of I(K1) from -120 to -80 mV in thermal injury group were also significantly lower than that in sham group. In contrast, we failed to detect any alterations in I(Ca-L) density, and voltage-dependence of activation and inactivation in thermal injury group, compared with that in sham group. Taken together, our data suggest that thermal injury results in function downregulation of transient outward potassium channels and inward rectifier potassium channels, which contributes, at least in part, to APD prolongation and subsequent cardiac dysfunction.
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Affiliation(s)
- Jian-Xin Deng
- Department of Pathophysiology, Key Laboratory of Shock and Microcirculation of Guangdong Province, Southern Medical University, Guangzhou 510515, China
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19
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Tan XH, Cheng X, Zhou J, Chen HX, Lin FY, Deng JX, Yang X, Huang PT. [Bovine alpha-sl-casein gene sequences direct expression of a variant of human tissue plasminogen activator in the milk of transgenic mice]. Yi Chuan Xue Bao 2001; 28:405-10. [PMID: 11441652] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/16/2023]
Abstract
The fusion gene containing the promoter of casein gene, LAtPA minigene and 3' flanking sequences of casein gene was introduced into the fertilized eggs of mice by microinjection. Five positive transgenic mice were obtained. The concentration of LAtPA in the milk of one female transgenic mouse is 0.18 microgram/ml. This result showed that the LAtPA minigene could correctly express the bioactive LAtPA in the milk of the transgenic mouse under the control of the regulatory elements of the casein gene.
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Affiliation(s)
- X H Tan
- Molecnlar Genetics Key Laboratory, Institute of Biotechnology, Academy of Military Medical Sciences, Beijing 100071, China
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20
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Chen HX, Chen X, Yang X, Deng JX, Su GF, Huang PT. [The expression of tPA directed by the bovine BLG regulatory elements in the mammary gland of transgenic mice]. Sheng Wu Gong Cheng Xue Bao 2001; 17:135-9. [PMID: 11411218] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/20/2023]
Abstract
In order to get the regulatory elements which are essential for generating mammary gland bioreactors, the whole 8.4 kb bovine BLG gene was obtained by PCR amplification. The 1.6 kb chicken lysozyme matrix attachment region (MAR) was used to overcome position effects. The bovine BLG-tPA expression vector was constructed and the BLG-tPA fusion gene was introduced into fertilized eggs of mice by microinjection to generate transgenic mouse. 170 offsprings were obtained, of which 9 were proved to be transgenic mice based on PCR and Southern-blot analysis. The tPA expression level amounted to 12 micrograms/mL in the milk of mice. The bovine BLG-tPA fusion gene integrated in the founders was inheritable.
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Affiliation(s)
- H X Chen
- Institute of Biotechnology, Academy of Military Medical Sciences, Beijing 100071, China
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21
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Zhou J, Deng JX, Cheng X, Lu YF, Yang X, Huang PT. [Co-integration of BLG-LAtPA and WAP improved the expression of LAtPA in transgenic mouse milk]. Sheng Wu Gong Cheng Xue Bao 2001; 17:64-7. [PMID: 11330190] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/19/2023]
Abstract
In order to improve the expression of longer acting tissue plasminogen activator in the mammary epithelium of transgenic mice, the fragment of BLG-LAtPA hydrid gene was microinjected into mouse embryos with mice whey acid protein gene. Three mouse were tested as being Co-integration of BLG-LAtPA and WAP transgene by PCR and Southern blot. Milk obtained from lactating females contains biologically active tPA, and the concentration of tPA was calculated to be about 10 micrograms/mL.
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Affiliation(s)
- J Zhou
- Institute of Beijing Biotechnology, Beijing 100071, China
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22
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Zhang YH, Lu YF, Liu YP, Deng JX. [Cloning cDNA of extracellular domain of human erythropoietin receptor and its expression in Escherichia coli]. Sheng Wu Gong Cheng Xue Bao 2000; 16:328-32. [PMID: 11059274] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/18/2023]
Abstract
Human erythropoietin receptor (hEpoR) plays an important role in regulating the red blood cell production by promoting the proliferation and differentiation of RBC from erythroid precursors. hEpoR is a transmembrane protein, and its extrocellular domain (sEpoR) is of great importance in Epo signal transduction pathway. We cloned the gene of sEpoR by RT-PCR from the total RNA of human fetal liver and expressed it in E. coli after insertion of the gene in the expression vector pBV220. The cloned gene was confirmed by sequencing analysis and gene product was confirmed by both Western blot and its first 11 amino acid residues sequence of the N-terminal. In vitro bioassay showed that the purified gene product can repress the growth of TF-cells in the presence of Epo.
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23
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Lu YF, Tian C, Deng JX, Xiao CZ, Ma QJ. [Cloning of human G-CSF genomic gene and its expression in transgenic mice mammary gland]. Yi Chuan Xue Bao 1999; 26:281-7. [PMID: 10593016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/14/2023]
Abstract
Human genomic DNA was used as template of PCR. 1.5 kb G-CSF genomic DNA was obtained using PCR amplification method. Sequence analysis showed that genomic DNA sequence of human G-CSF was correct. The vector of mammary gland expression was constructed and contained whey acid protein (WAP) 5' control region directed human G-CSF genomic DNA. In order to produce transgenic mice, 1200 fertilized eggs were microninjected using WAP-G-CSF fragment. Two male transgenic mice were obtained and identified using PCR method and Southern analysis. Integration rate of human G-CSF gene was 2.37% in mice. Foreign gene could also be identified in F1 and F2 transgenic mice. Expression levels of human G-CSF in transgenic mouse milk were 120-250 ng/ml.
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Affiliation(s)
- Y F Lu
- Institute of Biotechnique Academy of Military Medicine, Beijing
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24
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Lu YF, Tian C, Deng JX, Xiao CZ, MA QJ. [Studies of foreign gene integeation during embryo early development]. Yi Chuan Xue Bao 1998; 25:485-90. [PMID: 10465894] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/13/2023]
Abstract
There are still some problems in transgenic animals. Gene transfer, for example, reamins a difficult and costly task for animals, the vectors carrying the gene coding for the proteins of interest are of unpredictable efficiency. Therefore, it is important to identify foreign gene integration in genomose before transferring fertilized eggs to receptors, in order to increase efficiency of producing transgenic animal. In this paper, the construct that mice whey acid protein (WAP) gene promoter directs G-CSF gene was used to microinject fertilized eggs of mice. Fertilized eggs containing foreign gene were measured by using PCR method. The results showed that 100%, 77.7% and 44.4% retentions of foreign gene were achieved in 1, 2 and 8 cell-stage, respectively. Two part homologous recombination fragments were constructed and coinjected in to fertilized eggs of mice. PCR amplification fragment went beyond this homologous recombination area. If foreign gene could not integrate in to genomose, the fragment of PCR amplification could not be produced during embryo development. The results showed that the rationes of foreign gene integrated in to genomoes in 1, 2 and 8 cell-stage were 11.1%, 55.5% and 44.4%, respectively. This method might provide us a way to screen transgenic eggs when we use embryo section technique in farm animal.
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Affiliation(s)
- Y F Lu
- Institute of Biotechnology, Academy of Military Medical Science, Beijing
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