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Yuan S, Zhao Q, Yu K, Gao Y, Ma Z, Li H, Yu Y. Transcriptomic Screening of Alternaria oxytropis Isolated from Locoweed Plants for Genes Involved in Mycotoxin Swaisonine Production. J Fungi (Basel) 2024; 10:88. [PMID: 38276034 PMCID: PMC10820250 DOI: 10.3390/jof10010088] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2023] [Revised: 01/19/2024] [Accepted: 01/20/2024] [Indexed: 01/27/2024] Open
Abstract
Locoweed is a collective name for a variety of plants, such as Oxytropis and Astragalus L. When these plants are infected by some fungi or endophytes, they will produce an alkaloid (swainsonine) that is harmful to livestock. Chronic toxicity characterized by neurological disorders occurs in livestock overfed on locoweed, and swainsonine (SW) is considered a major toxic component. The mechanism of the SW synthesis of endophytic fungi from locoweed remains unknown. In order to further discover the possible synthetic pathway of SW, in this study, a mycotoxin (SW) producer, Alternaria oxytropis isolate, UA003, isolated from Locoweed plants, and its mutant were subjected to transcriptomic analyses to ascertain the genes involved in the synthesis of this toxin. Mutant strain A. oxytropis E02 was obtained by ethyl methanesulfonate (EMS) mutagenesis treatment, and the strains were sequenced with different culture times for transcriptomic analysis and screening of differentially expressed genes. The results show a highly significant (p < 0.01) increase in SW yield in the A. oxytropis E02 strain obtained by EMS mutagenesis treatment compared to A. oxytropis UA003. A total of 637 differentially expressed genes were screened by transcriptome sequencing analysis, including 11 genes potentially associated with SW biosynthesis. These genes were screened using GO and KEGG data annotation and analysis. Among the differential genes, evm.TU.Contig4.409, evm.TU.Contig19.10, and evm.TU.Contig50.48 were associated with L-lysine biosynthesis, the L-pipecolic acid pathway, and the α-aminoadipic acid synthesis pathway. This study provides new insights to elucidate the mechanism of SW synthesis of endophytic fungi in locoweed and provides data support for further exploration of A. oxytropis genomics studies.
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Affiliation(s)
- Shuangjie Yuan
- School of Animal Science and Technology, Ningxia University, Yinchuan 750021, China
- Ningxia Key Laboratory of Ruminant Molecular and Cellular Breeding, School of Animal Science and Technology, Ningxia University, Yinchuan 750021, China
| | - Qingmei Zhao
- College of Biological Science and Engineering, North Minzu University, Yinchuan 750021, China
| | - Kun Yu
- School of Animal Science and Technology, Ningxia University, Yinchuan 750021, China
- Ningxia Key Laboratory of Ruminant Molecular and Cellular Breeding, School of Animal Science and Technology, Ningxia University, Yinchuan 750021, China
| | - Ying Gao
- School of Animal Science and Technology, Ningxia University, Yinchuan 750021, China
- Ningxia Key Laboratory of Ruminant Molecular and Cellular Breeding, School of Animal Science and Technology, Ningxia University, Yinchuan 750021, China
| | - Zhengbing Ma
- School of Animal Science and Technology, Ningxia University, Yinchuan 750021, China
- Ningxia Key Laboratory of Ruminant Molecular and Cellular Breeding, School of Animal Science and Technology, Ningxia University, Yinchuan 750021, China
| | - Huanyu Li
- School of Animal Science and Technology, Ningxia University, Yinchuan 750021, China
- Ningxia Key Laboratory of Ruminant Molecular and Cellular Breeding, School of Animal Science and Technology, Ningxia University, Yinchuan 750021, China
| | - Yongtao Yu
- School of Animal Science and Technology, Ningxia University, Yinchuan 750021, China
- Ningxia Key Laboratory of Ruminant Molecular and Cellular Breeding, School of Animal Science and Technology, Ningxia University, Yinchuan 750021, China
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Du Q, Li J, Wang L, Chen H, Jiang M, Chen Z, Jiang C, Gao H, Wang B, Liu C. Complete chloroplast genomes of two medicinal Swertia species: the comparative evolutionary analysis of Swertia genus in the Gentianaceae family. PLANTA 2022; 256:73. [PMID: 36083348 DOI: 10.1007/s00425-022-03987-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/25/2022] [Accepted: 08/29/2022] [Indexed: 06/15/2023]
Abstract
The complete chloroplast genome of Swertia kouitchensis has been sequenced and assembled, compared with that of S. bimaculata to determine the evolutionary relationships among species of the Swertia in the Gentianaceae family. Swertia kouitchensis and S. bimaculata are from the Gentianaceae family. The complete chloroplast genome of S. kouitchensis was newly assembled, annotated, and analyzed by Illumina Hiseq 2500 platform. The chloroplast genomes of the two species encoded a total of 133, 134 genes, which included 88-89 protein-coding genes, 37 transfer RNA (tRNA) genes, and 8 ribosomal RNA genes. One intron was contained in each of the eight protein-coding genes and eight tRNA-coding genes, whereas two introns were found in two genes (ycf3 and clpP). The most abundant codon of the two species was for isoleucine, and the least abundant codon was for cysteine. The number of microsatellite repeat sequences was twenty-eight and thirty-two identified in the chloroplast genomes of S. kouitchensis and S. bimaculata, respectively. A total of 1127 repeat sequences were identified in all the 23 Swertia chloroplast genomes, and they fell into four categories. Furthermore, five divergence hotspot regions can be applied to discriminate these 23 Swertia species through genomes comparison. One pair of genus-specific DNA barcodes primer has been accurately identified. Therefore, the diverse regions cloned by a specific primer may become an effective and powerful molecular marker for the identification of Swertia genus. Moreover, four genes (ccsA, ndhK, rpoC1, and rps12) were positive selective pressure. The phylogenetic tree showed that the 23 Swertia species were clustered into a large clade including four evident subbranches, whereas the two species of S. kouitchensis and S. bimaculata were separately clustered into the diverse but correlated species group.
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Affiliation(s)
- Qing Du
- Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences, Peking Union Medical College, No. 151, Malianwa North Road, Hai Dian District, Beijing, 100193, People's Republic of China.
- College of Pharmacy, Key Laboratory of Medicinal Plant Resources of Qinghai-Tibetan Plateau in Qinghai Province, Qinghai Minzu University, No.3, Bayi Mid-road, Chengdong District, Xining City, Qinghai Province, 810007, People's Republic of China.
- Fresh Sky-Right (Beijing) International Science and Technology Co., Ltd, No.59, Banjing Road, Haidian District, Beijing, 100097, People's Republic of China.
| | - Jing Li
- Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences, Peking Union Medical College, No. 151, Malianwa North Road, Hai Dian District, Beijing, 100193, People's Republic of China
- Xiangnan University, No. 889, Chenzhou dadao, Chenzhou City, Hunan Province, 423000, People's Republic of China
| | - Liqiang Wang
- College of Pharmacy, Heze University, No.2269, University Road, Mudan District, Heze City, Shandong Province, 274015, People's Republic of China
| | - Haimei Chen
- Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences, Peking Union Medical College, No. 151, Malianwa North Road, Hai Dian District, Beijing, 100193, People's Republic of China
| | - Mei Jiang
- Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences, Peking Union Medical College, No. 151, Malianwa North Road, Hai Dian District, Beijing, 100193, People's Republic of China
- School of Pharmaceutical Sciences, Qilu University of Technology (Shandong Academy of Sciences), No. 3501, University Road, Changqing District, Jinan City, Shandong Province, 250399, People's Republic of China
| | - Zhuoer Chen
- Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences, Peking Union Medical College, No. 151, Malianwa North Road, Hai Dian District, Beijing, 100193, People's Republic of China
- Xiangnan University, No. 889, Chenzhou dadao, Chenzhou City, Hunan Province, 423000, People's Republic of China
| | - Chuanbei Jiang
- Genepioneer Biotechnologies Inc, No. 9, Weidi Road, Qixia District, Nanjing City, Jiangsu Province, 210000, People's Republic of China
| | - Haidong Gao
- Genepioneer Biotechnologies Inc, No. 9, Weidi Road, Qixia District, Nanjing City, Jiangsu Province, 210000, People's Republic of China
| | - Bin Wang
- Xiangnan University, No. 889, Chenzhou dadao, Chenzhou City, Hunan Province, 423000, People's Republic of China.
| | - Chang Liu
- Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences, Peking Union Medical College, No. 151, Malianwa North Road, Hai Dian District, Beijing, 100193, People's Republic of China.
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Quach QN, Gardner DR, Clay K, Cook D. Phylogenetic Patterns of Swainsonine Presence in Morning Glories. Front Microbiol 2022; 13:871148. [PMID: 35591984 PMCID: PMC9111539 DOI: 10.3389/fmicb.2022.871148] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2022] [Accepted: 03/07/2022] [Indexed: 11/13/2022] Open
Abstract
Endosymbionts play important roles in the life cycles of many macro-organisms. The indolizidine alkaloid swainsonine is produced by heritable fungi that occurs in diverse plant families, such as locoweeds (Fabaceae) and morning glories (Convolvulaceae) plus two species of Malvaceae. Swainsonine is known for its toxic effects on livestock following the ingestion of locoweeds and the potential for pharmaceutical applications. We sampled and tested herbarium seed samples (n = 983) from 244 morning glory species for the presence of swainsonine and built a phylogeny based on available internal transcribed spacer (ITS) sequences of the sampled species. We show that swainsonine occurs only in a single morning glory clade and host species are established on multiple continents. Our results further indicate that this symbiosis developed ∼5 mya and that swainsonine-positive species have larger seeds than their uninfected conspecifics.
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Affiliation(s)
- Quynh N Quach
- Department of Ecology and Evolutionary Biology, Tulane University, New Orleans, LA, United States
| | - Dale R Gardner
- United States Department of Agriculture - Agricultural Research Service, Poisonous Plant Research Laboratory, Logan, UT, United States
| | - Keith Clay
- Department of Ecology and Evolutionary Biology, Tulane University, New Orleans, LA, United States
| | - Daniel Cook
- United States Department of Agriculture - Agricultural Research Service, Poisonous Plant Research Laboratory, Logan, UT, United States
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Tian C, Li X, Wu Z, Li Z, Hou X, Li FY. Characterization and Comparative Analysis of Complete Chloroplast Genomes of Three Species From the Genus Astragalus (Leguminosae). Front Genet 2021; 12:705482. [PMID: 34422006 PMCID: PMC8378255 DOI: 10.3389/fgene.2021.705482] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2021] [Accepted: 07/16/2021] [Indexed: 12/12/2022] Open
Abstract
Astragalus is the largest genus in Leguminosae. Several molecular studies have investigated the potential adulterants of the species within this genus; nonetheless, the evolutionary relationships among these species remain unclear. Herein, we sequenced and annotated the complete chloroplast genomes of three Astragalus species—Astragalus adsurgens, Astragalus mongholicus var. dahuricus, and Astragalus melilotoides using next-generation sequencing technology and plastid genome annotator (PGA) tool. All species belonged to the inverted repeat lacking clade (IRLC) and had similar sequences concerning gene contents and characteristics. Abundant simple sequence repeat (SSR) loci were detected, with single-nucleotide repeats accounting for the highest proportion of SSRs, most of which were A/T homopolymers. Using Astragalus membranaceus var. membranaceus as reference, the divergence was evident in most non-coding regions of the complete chloroplast genomes of these species. Seven genes (atpB, psbD, rpoB, rpoC1, trnV, rrn16, and rrn23) showed high nucleotide variability (Pi), and could be used as DNA barcodes for Astragalus sp. cemA and rpl33 were found undergoing positive selection by the section patterns in the coded protein. Phylogenetic analysis showed that Astragalus is a monophyletic group closely related to the genus Oxytropis within the tribe Galegeae. The newly sequenced chloroplast genomes provide insight into the unresolved evolutionary relationships within Astragalus spp. and are expected to contribute to species identification.
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Affiliation(s)
- Chunyu Tian
- Institute of Grassland Research, Chinese Academy of Agricultural Sciences, Hohhot, China.,School of Ecology and Environment, Inner Mongolia University, Hohhot, China
| | - Xiansong Li
- Institute of Grassland Research, Chinese Academy of Agricultural Sciences, Hohhot, China.,Key Laboratory of Grassland Resources and Utilization of Ministry of Agriculture, Hohhot, China
| | - Zinian Wu
- Institute of Grassland Research, Chinese Academy of Agricultural Sciences, Hohhot, China.,Key Laboratory of Grassland Resources and Utilization of Ministry of Agriculture, Hohhot, China
| | - Zhiyong Li
- Institute of Grassland Research, Chinese Academy of Agricultural Sciences, Hohhot, China.,Key Laboratory of Grassland Resources and Utilization of Ministry of Agriculture, Hohhot, China
| | - Xiangyang Hou
- Institute of Grassland Research, Chinese Academy of Agricultural Sciences, Hohhot, China
| | - Frank Yonghong Li
- School of Ecology and Environment, Inner Mongolia University, Hohhot, China
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Cook D, Lee ST, Gardner DR, Molyneux RJ, Johnson RL, Taylor CM. Use of Herbarium Voucher Specimens To Investigate Phytochemical Composition in Poisonous Plant Research. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2021; 69:4037-4047. [PMID: 33797894 DOI: 10.1021/acs.jafc.1c00708] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Poisonous plants cause large losses to the livestock industry through death, reduced production efficiency, reproductive dysfunction, and compromised harvesting of rangeland and pasture forages. Research investigating poisonous plants is complex because there are hundreds of genera of toxic plants representing thousands of species. To investigate the effects of poisonous plants on livestock, a clear understanding of the taxonomic identity of the plant and the ability to collect the plant in sufficient quantities for scientific studies is required. Subsequently, the active principles must be defined and investigated in the taxa of interest to better predict risk and make recommendations to reduce losses. Herbaria are collections of preserved plant specimens and are an important resource in poisonous plant research. Voucher specimens have often been used in the identification of the plant for the experimental reproduction of suspected livestock poisoning associated with a spontaneous case. More recently, herbarium specimens have been used to investigate the chemical composition of toxic plants as well as the distribution of different chemotypes over the landscape. The primary purpose of this review is to highlight the chemical analysis of herbarium specimens in poisonous plant research.
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Affiliation(s)
- Daniel Cook
- Poisonous Plant Research Laboratory, Agricultural Research Service, United States Department of Agriculture, 1150 East 1400 North, Logan, Utah 84341, United States
| | - Stephen T Lee
- Poisonous Plant Research Laboratory, Agricultural Research Service, United States Department of Agriculture, 1150 East 1400 North, Logan, Utah 84341, United States
| | - Dale R Gardner
- Poisonous Plant Research Laboratory, Agricultural Research Service, United States Department of Agriculture, 1150 East 1400 North, Logan, Utah 84341, United States
| | - Russell J Molyneux
- Daniel K. Inouye College of Pharmacy, University of Hawaii at Hilo, 200 West Kawili Street, Hilo, Hawaii 96720-4091, United States
| | - Robert L Johnson
- Stanley L. Welsh Herbarium, Brigham Young University, Provo, Utah 84602, United States
| | - Charlotte M Taylor
- Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, Missouri 63110, United States
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Cook D, Lee ST, Panaccione DG, Leadmon CE, Clay K, Gardner DR. Biodiversity of Convolvulaceous species that contain Ergot Alkaloids, Indole Diterpene Alkaloids, and Swainsonine. BIOCHEM SYST ECOL 2019; 86. [PMID: 31496550 DOI: 10.1016/j.bse.2019.103921] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Convolvulaceous species have been reported to contain several bioactive principles thought to be toxic to livestock including the calystegines, swainsonine, ergot alkaloids, and indole diterpene alkaloids. Swainsonine, ergot alkaloids, and indole diterpene alkaloids are produced by seed transmitted fungal symbionts associated with their respective plant host, while the calystegines are produced by the plant. To date, Ipomoea asarifolia and Ipomoea muelleri represent the only Ipomoea species and members of the Convolvulaceae known to contain indole diterpene alkaloids, however several other Convolvulaceous species are reported to contain ergot alkaloids. To further explore the biodiversity of species that may contain indole diterpenes, we analyzed several Convolvulaceous species (n=30) for indole diterpene alkaloids, representing four genera, Argyreia, Ipomoea, Stictocardia, and Turbina, that had been previously reported to contain ergot alkaloids. These species were also verified to contain ergot alkaloids and subsequently analyzed for swainsonine. Ergot alkaloids were detected in 18 species representing all four genera screened, indole diterpenes were detected in two Argyreia species and eight Ipomoea species of the 18 that contained ergot alkaloids, and swainsonine was detected in two Ipomoea species. The data suggest a strong association exists between the relationship of the Periglandula species associated with each host and the occurrence of the ergot alkaloids and/or the indole diterpenes reported here. Likewise there appears to be an association between the occurrence of the respective bioactive principle and the genetic relatedness of the respective host plant species.
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Affiliation(s)
- Daniel Cook
- Poisonous Plant Research Laboratory, Agricultural Research Service, United States Department of Agriculture, 1150 E. 1400 N., Logan, UT 84341, USA
| | - Stephen T Lee
- Poisonous Plant Research Laboratory, Agricultural Research Service, United States Department of Agriculture, 1150 E. 1400 N., Logan, UT 84341, USA
| | - Daniel G Panaccione
- West Virginia University, Division of Plant and Soil Sciences, Morgantown, WV 26506, USA
| | - Caroline E Leadmon
- West Virginia University, Division of Plant and Soil Sciences, Morgantown, WV 26506, USA
| | - Keith Clay
- Department of Ecology and Evolutionary Biology, Tulane University, New Orleans, LA 70118, USA
| | - Dale R Gardner
- Poisonous Plant Research Laboratory, Agricultural Research Service, United States Department of Agriculture, 1150 E. 1400 N., Logan, UT 84341, USA
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Cook D, Gardner DR, Martinez A, Robles CA, Pfister JA. Screening for swainsonine among South American Astragalus species. Toxicon 2017; 139:54-57. [DOI: 10.1016/j.toxicon.2017.09.014] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2017] [Revised: 09/21/2017] [Accepted: 09/24/2017] [Indexed: 10/18/2022]
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