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Usovsky M, Gamage VA, Meinhardt CG, Dietz N, Triller M, Basnet P, Gillman JD, Bilyeu KD, Song Q, Dhital B, Nguyen A, Mitchum MG, Scaboo AM. Loss-of-function of an α-SNAP gene confers resistance to soybean cyst nematode. Nat Commun 2023; 14:7629. [PMID: 37993454 PMCID: PMC10665432 DOI: 10.1038/s41467-023-43295-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2023] [Accepted: 11/06/2023] [Indexed: 11/24/2023] Open
Abstract
Plant-parasitic nematodes are one of the most economically impactful pests in agriculture resulting in billions of dollars in realized annual losses worldwide. Soybean cyst nematode (SCN) is the number one biotic constraint on soybean production making it a priority for the discovery, validation and functional characterization of native plant resistance genes and genetic modes of action that can be deployed to improve soybean yield across the globe. Here, we present the discovery and functional characterization of a soybean resistance gene, GmSNAP02. We use unique bi-parental populations to fine-map the precise genomic location, and a combination of whole genome resequencing and gene fragment PCR amplifications to identify and confirm causal haplotypes. Lastly, we validate our candidate gene using CRISPR-Cas9 genome editing and observe a gain of resistance in edited plants. This demonstrates that the GmSNAP02 gene confers a unique mode of resistance to SCN through loss-of-function mutations that implicate GmSNAP02 as a nematode virulence target. We highlight the immediate impact of utilizing GmSNAP02 as a genome-editing-amenable target to diversify nematode resistance in commercially available cultivars.
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Affiliation(s)
- Mariola Usovsky
- Division of Plant Science and Technology, University of Missouri, Columbia, MO, 65211, USA
| | - Vinavi A Gamage
- Department of Plant Pathology and Institute of Plant Breeding, Genetics and Genomics, University of Georgia, Athens, GA, 30602, USA
| | - Clinton G Meinhardt
- Division of Plant Science and Technology, University of Missouri, Columbia, MO, 65211, USA
| | - Nicholas Dietz
- Division of Plant Science and Technology, University of Missouri, Columbia, MO, 65211, USA
| | - Marissa Triller
- Division of Plant Science and Technology, University of Missouri, Columbia, MO, 65211, USA
| | - Pawan Basnet
- Division of Plant Science and Technology, University of Missouri, Columbia, MO, 65211, USA
| | - Jason D Gillman
- Plant Genetics Research Unit, United States Department of Agriculture-Agricultural Research Service, University of Missouri, Columbia, MO, 65211, USA
| | - Kristin D Bilyeu
- Plant Genetics Research Unit, United States Department of Agriculture-Agricultural Research Service, University of Missouri, Columbia, MO, 65211, USA
| | - Qijian Song
- Soybean Genomics and Improvement Laboratory, Beltsville Agricultural Research Center, Beltsville, MD, 20705, USA
| | - Bishnu Dhital
- Division of Plant Science and Technology, University of Missouri, Columbia, MO, 65211, USA
| | - Alice Nguyen
- Division of Plant Science and Technology, University of Missouri, Columbia, MO, 65211, USA
| | - Melissa G Mitchum
- Department of Plant Pathology and Institute of Plant Breeding, Genetics and Genomics, University of Georgia, Athens, GA, 30602, USA.
| | - Andrew M Scaboo
- Division of Plant Science and Technology, University of Missouri, Columbia, MO, 65211, USA.
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McCarville MT, Daum J, Xing L, Moser H. Soybean Cyst Nematode Management Is Improved by Combining Native and Transgenic Resistance. PLANT DISEASE 2023; 107:2792-2798. [PMID: 36856644 DOI: 10.1094/pdis-10-22-2515-re] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Field trials were conducted to assess the benefit of combining a transgenic soybean cyst nematode (SCN) resistance trait, Cry14Ab-1 expressed by the event GMB151, with the native resistance allele rhg1b from PI 88788. The GMB151 event and rhg1b were crossed into common genetic backgrounds and segregated out to create four genetically related lines within each background. The lines created contained both native and transgenic resistance (rhg1b + GMB151), only native resistance (rhg1b alone), only transgenic resistance (GMB151 alone), or neither resistance type (susceptible). The benefit of GMB151 and rhg1b for SCN management was evaluated by measuring SCN control and yield protection. Soybean cyst nematode control was assessed by counting the number of females and cysts on roots early in the season and measuring the change in SCN egg population density over the entire season. The GMB151 transgenic event and the native resistance allele rhg1b both reduced early season SCN reproduction and contributed to significantly higher soybean yield. Compared to susceptible lines, the rhg1b allele improved yield by 33%, while GMB151 improved yield by 13%. Combining the GMB151 event and rhg1b allele resulted in greater SCN control and yield improvement than either provided alone. The combination of GMB151 and rhg1b reduced season-long SCN reproduction by 50% and resulted in 44% greater yield than the susceptible lines. Soybean cyst nematode virulence to rhg1b continues to increase due to the continuous planting of PI 88788-derived resistant cultivars. Pyramiding GMB151 with rhg1b provides a new management option to improve SCN control and soybean yield.
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Tian Y, Li D, Wang X, Zhang H, Wang J, Yu L, Guo C, Luan X, Liu X, Li H, Reif JC, Li YH, Qiu LJ. Deciphering the genetic basis of resistance to soybean cyst nematode combining IBD and association mapping. TAG. THEORETICAL AND APPLIED GENETICS. THEORETISCHE UND ANGEWANDTE GENETIK 2023; 136:50. [PMID: 36912956 PMCID: PMC10011322 DOI: 10.1007/s00122-023-04268-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/02/2022] [Accepted: 12/07/2022] [Indexed: 06/18/2023]
Abstract
IBD analysis clarified the dynamics of chromosomal recombination during the ZP pedigree breeding process and identified ten genomic regions resistant to SCN race3 combining association mapping. Soybean cyst nematode (SCN, Heterodera glycines Ichinohe) is one of the most devastating pathogens for soybean production worldwide. The cultivar Zhongpin03-5373 (ZP), derived from SCN-resistant progenitor parents, Peking, PI 437654 and Huipizhi Heidou, is an elite line with high resistance to SCN race3. In the current study, a pedigree variation map was generated for ZP and its ten progenitors using 3,025,264 high-quality SNPs identified from an average of 16.2 × re-sequencing for each genome. Through identity by decent (IBD) tracking, we showed the dynamic change of genome and detected important IBD fragments, which revealed the comprehensively artificial selection of important traits during ZP breeding process. A total of 2,353 IBD fragments related to SCN resistance including SCN-resistant genes rhg1, rhg4 and NSFRAN07 were identified based on the resistant-related genetic paths. Moreover, 23 genomic regions underlying resistance to SCN race3 were identified by genome-wide association study (GWAS) in 481 re-sequenced cultivated soybeans. Ten common loci were found by both IBD tracking and GWAS analysis. Haplotype analysis of 16 potential candidate genes suggested a causative SNP (C/T, - 1065) located in the promoter of Glyma.08G096500 and encoding a predicted TIFY5b-related protein on chr8 was highly correlated with SCN race3 resistance. Our results more thoroughly elucidated the dynamics of genomic fragments during ZP pedigree breeding and the genetic basis of SCN resistance, which will provide useful information for gene cloning and the development of resistant soybean cultivars using a marker-assisted selection approach.
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Affiliation(s)
- Yu Tian
- The National Key Facility for Gene Resources and Genetic Improvement/Key Laboratory of Crop Germplasm Utilization, Institute of Crop Sciences, Chinese Academy of Agricultural Science, Beijing, 100081, People's Republic of China
| | - Delin Li
- The National Key Facility for Gene Resources and Genetic Improvement/Key Laboratory of Crop Germplasm Utilization, Institute of Crop Sciences, Chinese Academy of Agricultural Science, Beijing, 100081, People's Republic of China
| | - Xueqing Wang
- The National Key Facility for Gene Resources and Genetic Improvement/Key Laboratory of Crop Germplasm Utilization, Institute of Crop Sciences, Chinese Academy of Agricultural Science, Beijing, 100081, People's Republic of China
| | - Hao Zhang
- The National Key Facility for Gene Resources and Genetic Improvement/Key Laboratory of Crop Germplasm Utilization, Institute of Crop Sciences, Chinese Academy of Agricultural Science, Beijing, 100081, People's Republic of China
| | - Jiajun Wang
- Soybean Research Institute, Heilongjiang Academy of Agricultural Sciences, Harbin, 150086, China
| | - Lijie Yu
- Key Laboratory of Molecular Cytogenetics and Genetic Breeding, College of Life Science and Technology, Harbin Normal University, Heilongjiang Province, Harbin, China
| | - Changhong Guo
- Key Laboratory of Molecular Cytogenetics and Genetic Breeding, College of Life Science and Technology, Harbin Normal University, Heilongjiang Province, Harbin, China
| | - Xiaoyan Luan
- Soybean Research Institute, Heilongjiang Academy of Agricultural Sciences, Harbin, 150086, China
| | - Xinlei Liu
- Soybean Research Institute, Heilongjiang Academy of Agricultural Sciences, Harbin, 150086, China
| | - Hongjie Li
- The National Key Facility for Gene Resources and Genetic Improvement/Key Laboratory of Crop Germplasm Utilization, Institute of Crop Sciences, Chinese Academy of Agricultural Science, Beijing, 100081, People's Republic of China
| | - Jochen C Reif
- Department of Breeding Research, Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), Gatersleben, Germany
| | - Ying-Hui Li
- The National Key Facility for Gene Resources and Genetic Improvement/Key Laboratory of Crop Germplasm Utilization, Institute of Crop Sciences, Chinese Academy of Agricultural Science, Beijing, 100081, People's Republic of China.
| | - Li-Juan Qiu
- The National Key Facility for Gene Resources and Genetic Improvement/Key Laboratory of Crop Germplasm Utilization, Institute of Crop Sciences, Chinese Academy of Agricultural Science, Beijing, 100081, People's Republic of China.
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Abstract
Resistance to the soybean cyst nematode (SCN) is a topic incorporating multiple mechanisms and multiple types of science. It is also a topic of substantial agricultural importance, as SCN is estimated to cause more yield damage than any other pathogen of soybean, one of the world's main food crops. Both soybean and SCN have experienced jumps in experimental tractability in the past decade, and significant advances have been made. The rhg1-b locus, deployed on millions of farm acres, has been durable and will remain important, but local SCN populations are gradually evolving to overcome rhg1-b. Multiple other SCN resistance quantitative trait loci (QTL) of proven value are now in play with soybean breeders. QTL causal gene discovery and mechanistic insights into SCN resistance are contributing to both basic and applied disciplines. Additional understanding of SCN and other cyst nematodes will also grow in importance and lead to novel disease control strategies.
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Affiliation(s)
- Andrew F Bent
- Department of Plant Pathology, University of Wisconsin-Madison, Madison, Wisconsin, USA;
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Lian Y, Koch G, Bo D, Wang J, Nguyen HT, Li C, Lu W. The Spatial Distribution and Genetic Diversity of the Soybean Cyst Nematode, Heterodera glycines, in China: It Is Time to Take Measures to Control Soybean Cyst Nematode. FRONTIERS IN PLANT SCIENCE 2022; 13:927773. [PMID: 35783986 PMCID: PMC9242501 DOI: 10.3389/fpls.2022.927773] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/25/2022] [Accepted: 05/23/2022] [Indexed: 06/15/2023]
Abstract
The continuous evolution and spread of virulent forms of the soybean cyst nematode (SCN) driven by the environment and anthropogenic intervention is a serious threat to the soybean production worldwide, including China. Especially in China, the implemented measures to control SCN are insufficient for sustainable agricultural development yet. We summarized our knowledge about the spread and spatial distribution of SCN in China and the virulence diversity in the main soybean growing areas. To reveal the genetic relatedness and diversity of SCN populations, we re-sequenced 53 SCN genomes from the Huang-Huai Valleys, one of the two main soybean growing areas in China. We identified spreading patterns linked to the local agroecosystems and topographies. Moreover, we disclosed the first evidence for the selection of complex virulence in the field even under low selection pressure in an example from North Shanxi. SCN is present in all soybean growing areas in China but SCN susceptible cultivars are still largely grown indicating that SCN-related damage and financial loss have not received the attention they deserve yet. To prevent increasing yield losses and to improve the acceptance of resistant cultivars by the growers, we emphasized that it is time to accelerate SCN resistance breeding, planting resistant cultivars to a larger extent, and to support farmers to implement a wider crop rotation for sustainable development of the soybean production in China.
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Affiliation(s)
- Yun Lian
- Henan Academy of Crops Molecular Breeding, National Centre for Plant Breeding, Zhengzhou Subcenter of National Soybean Improvement Center, Key Laboratory of Oil Crops in Huang Huaihai Plains, Ministry of Agriculture and Rural Affairs, Henan Provincial Key Laboratory for Oil Crops Improvement, Zhengzhou, China
| | - Georg Koch
- National Centre for Plant Breeding, Xinxiang, China
| | - Dexin Bo
- Hubei Key Laboratory of Agricultural Bioinformatics, Huazhong Agricultural University, Wuhan, China
| | - Jinshe Wang
- Henan Academy of Crops Molecular Breeding, National Centre for Plant Breeding, Zhengzhou Subcenter of National Soybean Improvement Center, Key Laboratory of Oil Crops in Huang Huaihai Plains, Ministry of Agriculture and Rural Affairs, Henan Provincial Key Laboratory for Oil Crops Improvement, Zhengzhou, China
| | - Henry T. Nguyen
- Division of Plant Sciences, University of Missouri, Columbia, MO, United States
| | - Chun Li
- Henan Academy of Crops Molecular Breeding, National Centre for Plant Breeding, Zhengzhou Subcenter of National Soybean Improvement Center, Key Laboratory of Oil Crops in Huang Huaihai Plains, Ministry of Agriculture and Rural Affairs, Henan Provincial Key Laboratory for Oil Crops Improvement, Zhengzhou, China
| | - Weiguo Lu
- Henan Academy of Crops Molecular Breeding, National Centre for Plant Breeding, Zhengzhou Subcenter of National Soybean Improvement Center, Key Laboratory of Oil Crops in Huang Huaihai Plains, Ministry of Agriculture and Rural Affairs, Henan Provincial Key Laboratory for Oil Crops Improvement, Zhengzhou, China
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6
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Basnet P, Meinhardt CG, Usovsky M, Gillman JD, Joshi T, Song Q, Diers B, Mitchum MG, Scaboo AM. Epistatic interaction between Rhg1-a and Rhg2 in PI 90763 confers resistance to virulent soybean cyst nematode populations. TAG. THEORETICAL AND APPLIED GENETICS. THEORETISCHE UND ANGEWANDTE GENETIK 2022; 135:2025-2039. [PMID: 35381870 PMCID: PMC9205835 DOI: 10.1007/s00122-022-04091-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/2021] [Accepted: 03/25/2022] [Indexed: 05/19/2023]
Abstract
KEY MESSAGE An epistatic interaction between SCN resistance loci rhg1-a and rhg2 in PI 90763 imparts resistance against virulent SCN populations which can be employed to diversify SCN resistance in soybean cultivars. With more than 95% of the $46.1B soybean market dominated by a single type of genetic resistance, breeding for soybean cyst nematode (SCN)-resistant soybean that can effectively combat the widespread increase in virulent SCN populations presents a significant challenge. Rhg genes (for Resistance to Heterodera glycines) play a key role in resistance to SCN; however, their deployment beyond the use of the rhg1-b allele has been limited. In this study, quantitative trait loci (QTL) were mapped using PI 90763 through two biparental F3:4 recombinant inbred line (RIL) populations segregating for rhg1-a and rhg1-b alleles against a SCN HG type 1.2.5.7 (Race 2) population. QTL located on chromosome 18 (rhg1-a) and chromosome 11 (rhg2) were determined to confer SCN resistance in PI 90763. The rhg2 gene was fine-mapped to a 169-Kbp region pinpointing GmSNAP11 as the strongest candidate gene. We demonstrated a unique epistatic interaction between rhg1-a and rhg2 loci that not only confers resistance to multiple virulent SCN populations. Further, we showed that pyramiding rhg2 with the conventional mode of resistance, rhg1-b, is ineffective against these virulent SCN populations. This highlights the importance of pyramiding rhg1-a and rhg2 to maximize the impact of gene pyramiding strategies toward management of SCN populations virulent on rhg1-b sources of resistance. Our results lay the foundation for the next generation of soybean resistance breeding to combat the number one pathogen of soybean.
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Affiliation(s)
- Pawan Basnet
- Division of Plant Science and Technology, University of Missouri, Columbia, MO, 65211, USA
| | - Clinton G Meinhardt
- Division of Plant Science and Technology, University of Missouri, Columbia, MO, 65211, USA
| | - Mariola Usovsky
- Division of Plant Science and Technology, University of Missouri, Columbia, MO, 65211, USA
| | | | - Trupti Joshi
- Department of Health Management and Informatics, MUIDSI, and Bond Life Sciences Center, University of Missouri-Columbia, Columbia, MO, 65211, USA
| | - Qijian Song
- Soybean Genomics and Improvement Laboratory, Beltsville Agricultural Research Center, USDA-ARS, Beltsville, MD, USA
| | - Brian Diers
- Department of Crop Sciences, University of Illinois, Urbana-Champaign, IL, USA
| | - Melissa G Mitchum
- Department of Plant Pathology and Institute of Plant Breeding, Genetics and Genomics, University of Georgia, Athens, GA, USA
| | - Andrew M Scaboo
- Division of Plant Science and Technology, University of Missouri, Columbia, MO, 65211, USA.
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7
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Thekke-Veetil T, McCoppin NK, Domier LL, Hajimorad M, Lambert KN, Lim HS, Hartman GL. Transient expression of a luciferase mRNA in plant-parasitic and free-living nematodes by electroporation. Mol Biochem Parasitol 2022; 250:111489. [DOI: 10.1016/j.molbiopara.2022.111489] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2022] [Revised: 05/03/2022] [Accepted: 05/25/2022] [Indexed: 11/25/2022]
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8
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Meinhardt C, Howland A, Ellersieck M, Scaboo A, Diers B, Mitchum MG. Resistance Gene Pyramiding and Rotation to Combat Widespread Soybean Cyst Nematode Virulence. PLANT DISEASE 2021; 105:3238-3243. [PMID: 33449807 DOI: 10.1094/pdis-12-20-2556-re] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Soybean cyst nematode (SCN) is an important pathogen of soybean causing >$1 billion in yield losses annually in the United States. Planting SCN-resistant soybean cultivars is the primary management strategy. Resistance genes derived from the plant introduction (PI) 88788 (rhg1-b) and PI 548402 (Peking; rhg1-a and Rhg4) are the main types of resistance available in commercial cultivars. The PI 88788 rhg1-b resistance allele is found in the majority of SCN-resistant cultivars in the north central United States. The widespread use of PI 88788 rhg1-b has led to limited options for farmers to rotate resistance sources to manage SCN. Consequently, overreliance on a single type of resistance has resulted in the selection of SCN populations that have adapted to reproduce on these resistant cultivars. Here we evaluated the effectiveness of rotating soybean lines with different combinations of resistance genes to determine the best strategy for combating the widespread increase in virulent SCN and limit future nematode adaptation to resistant cultivars. Eight SCN populations were developed by continuous selection of a virulent SCN field population (Heterodera glycines [HG] type 1.2.5.7) on a single resistance source or in rotation with soybean pyramiding different resistance gene alleles derived from PI 88788 (rhg1-b), PI 437654 (rhg1-a and Rhg4), PI 468916 (cqSCN-006 and cqSCN-007), and PI 567516C (Chr10). SCN population densities were determined for eight generations. HG type tests were conducted after the eighth generation to evaluate population shifts. The continued use of rhg1-b or 006/007 had limited effectiveness for reducing SCN type 1.2.5.7 population density, whereas rotation to the use of rhg1-a/Rhg4 resistance significantly reduced SCN population density but selected for broader SCN virulence (HG type 1.2.3.5.6.7). A rotation of rhg1-a/Rhg4 with a pyramid of rhg1-b/006/007/Chr10 was the most effective combination at both reducing population density and minimizing selection pressure. Our results provide guidance for implementation of a strategic SCN resistance rotation plan to manage the widespread virulence on PI 88788 and sustain the future durability of SCN resistance genes.
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Affiliation(s)
- Clinton Meinhardt
- Division of Plant Sciences and Bond Life Sciences Center, University of Missouri, Columbia, MO 65211
| | - Amanda Howland
- Division of Plant Sciences and Bond Life Sciences Center, University of Missouri, Columbia, MO 65211
| | - Mark Ellersieck
- Agriculture Experiment Station Statistician, University of Missouri, Columbia, MO 65211
| | - Andrew Scaboo
- Division of Plant Sciences, University of Missouri, Columbia, MO 65211
| | - Brian Diers
- Department of Crop Sciences, University of Illinois, Urbana, IL 61801
| | - Melissa G Mitchum
- Division of Plant Sciences and Bond Life Sciences Center, University of Missouri, Columbia, MO 65211
- Department of Plant Pathology and Institute of Plant Breeding, Genetics, and Genomics, University of Georgia, Athens, GA 30602
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9
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Maier TR, Masonbrink RE, Vijayapalani P, Gardner M, Howland AD, Mitchum MG, Baum TJ. Esophageal Gland RNA-Seq Resource of a Virulent and Avirulent Population of the Soybean Cyst Nematode Heterodera glycines. MOLECULAR PLANT-MICROBE INTERACTIONS : MPMI 2021; 34:1084-1087. [PMID: 33900122 DOI: 10.1094/mpmi-03-21-0051-a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
The soybean cyst nematode Heterodera glycines is the most economically devastating pathogen of soybean in the United States and threatens to become even more damaging through the selection of virulent nematode populations in the field that can overcome natural resistance mechanisms in soybean cultivars. This pathogen, therefore, demands intense transcriptomic/genomic research inquiries into the biology of its parasitic mechanisms. H. glycines delivers effector proteins that are produced in specialized gland cells into the soybean root to enable infection. The study of effector proteins, thus, is particularly promising when exploring novel management options against this pathogen. Here, we announce the availability of a gland cell-specific RNA-seq resource. These data represent an expression snapshot of gland cell activity during early soybean infection of a virulent and an avirulent H. glycines population, providing a unique and highly valuable resource for scientists examining effector biology and nematode virulence.[Formula: see text] Copyright © 2021 The Author(s). This is an open access article distributed under the CC BY-NC-ND 4.0 International license.
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Affiliation(s)
- Tom R Maier
- Department of Plant Pathology and Microbiology, Iowa State University, Ames, IA 50011, U.S.A
| | - Rick E Masonbrink
- Department of Plant Pathology and Microbiology, Iowa State University, Ames, IA 50011, U.S.A
- Genome Informatics Facility, Iowa State University, Ames, IA 50011, U.S.A
| | | | - Michael Gardner
- Division of Plant Sciences and Bond Life Sciences Center, University of Missouri, Columbia, MO 65211, U.S.A
| | - Amanda D Howland
- Division of Plant Sciences and Bond Life Sciences Center, University of Missouri, Columbia, MO 65211, U.S.A
| | - Melissa G Mitchum
- Division of Plant Sciences and Bond Life Sciences Center, University of Missouri, Columbia, MO 65211, U.S.A
- Department of Plant Pathology and Institute of Plant Breeding, Genetics, and Genomics, University of Georgia, Athens, GA 30602, U.S.A
| | - Thomas J Baum
- Department of Plant Pathology and Microbiology, Iowa State University, Ames, IA 50011, U.S.A
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10
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Kofsky J, Zhang H, Song BH. Novel resistance strategies to soybean cyst nematode (SCN) in wild soybean. Sci Rep 2021; 11:7967. [PMID: 33846373 PMCID: PMC8041904 DOI: 10.1038/s41598-021-86793-z] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2020] [Accepted: 03/15/2021] [Indexed: 02/01/2023] Open
Abstract
Soybean cyst nematode (SCN, Heterodera glycine Ichinohe) is the most damaging soybean pest worldwide and management of SCN remains challenging. The current SCN resistant soybean cultivars, mainly developed from the cultivated soybean gene pool, are losing resistance due to SCN race shifts. The domestication process and modern breeding practices of soybean cultivars often involve strong selection for desired agronomic traits, and thus, decreased genetic variation in modern cultivars, which consequently resulted in limited sources of SCN resistance. Wild soybean (Glycine soja) is the wild ancestor of cultivated soybean (Glycine max) and it's gene pool is indisputably more diverse than G. max. Our aim is to identify novel resistant genetic resources from wild soybean for the development of new SCN resistant cultivars. In this study, resistance response to HG type 2.5.7 (race 5) of SCN was investigated in a newly identified SCN resistant ecotype, NRS100. To understand the resistance mechanism in this ecotype, we compared RNA seq-based transcriptomes of NRS100 with two SCN-susceptible accessions of G. soja and G. max, as well as an extensively studied SCN resistant cultivar, Peking, under both control and nematode J2-treated conditions. The proposed mechanisms of resistance in NRS100 includes the suppression of the jasmonic acid (JA) signaling pathway in order to allow for salicylic acid (SA) signaling-activated resistance response and polyamine synthesis to promote structural integrity of root cell walls. Our study identifies a set of novel candidate genes and associated pathways involved in SCN resistance and the finding provides insight into the mechanism of SCN resistance in wild soybean, advancing the understanding of resistance and the use of wild soybean-sourced resistance for soybean improvement.
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Affiliation(s)
- Janice Kofsky
- Department of Biological Sciences, University of North Carolina at Charlotte, Charlotte, NC, 28223, USA
| | - Hengyou Zhang
- Department of Biological Sciences, University of North Carolina at Charlotte, Charlotte, NC, 28223, USA
- Donald Danforth Plant Science Center, Saint Louis, MO, 63132, USA
| | - Bao-Hua Song
- Department of Biological Sciences, University of North Carolina at Charlotte, Charlotte, NC, 28223, USA.
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11
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Roth MG, Jacobs JL, Napieralski S, Byrne AM, Stouffer-Hopkins A, Warner F, Chilvers MI. Fluopyram Suppresses Population Densities of Heterodera glycines in Field and Greenhouse Studies in Michigan. PLANT DISEASE 2020; 104:1305-1311. [PMID: 32155114 DOI: 10.1094/pdis-04-19-0874-re] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The soybean cyst nematode (SCN), Heterodera glycines Ichinohe, causes significant damage to soybean production annually. Fluopyram is a fungicide commonly used in soybean seed treatments intended to control soilborne fungal pathogens; however, recent studies have also suggested inhibitory effects on SCN. We examined the effects of a fluopyram seed treatment, ILeVO, on SCN reproduction, sudden death syndrome (SDS) development, and yield in a 3-year field study. Overall, fluopyram had a significant effect on yield (P = 0.046) and end-of-season SCN eggs and second-stage juveniles (Pf, P = 0.033) but no significant effect on SCN reproduction (Rf) or SDS disease index (P > 0.05). Post hoc tests indicated that fluopyram increased yield and suppressed SCN quantities. However, Rf was consistently greater than 1 whether or not the seed was treated with fluopyram, indicating that SCN populations were still increasing in the presence of fluopyram. A follow-up greenhouse study indicated that fluopyram reduced SCN relative to nontreated controls, as observed in the field, but only reduced SCN DNA within roots of a susceptible cultivar. These results indicate that fluopyram can suppress SCN quantities relative to nontreated seed but may not successfully reduce nematode populations without the use of additional management strategies.
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Affiliation(s)
- M G Roth
- Department of Plant, Soil and Microbial Sciences, Michigan State University, East Lansing, MI 48824, U.S.A
- Genetics Graduate Program, Michigan State University, East Lansing, MI 48824, U.S.A
| | - J L Jacobs
- Department of Plant, Soil and Microbial Sciences, Michigan State University, East Lansing, MI 48824, U.S.A
| | - S Napieralski
- Department of Geoscience, University of Wisconsin-Madison, Madison, WI 53706, U.S.A
| | - A M Byrne
- Department of Plant, Soil and Microbial Sciences, Michigan State University, East Lansing, MI 48824, U.S.A
| | - A Stouffer-Hopkins
- Department of Plant, Soil and Microbial Sciences, Michigan State University, East Lansing, MI 48824, U.S.A
| | - F Warner
- Department of Plant, Soil and Microbial Sciences, Michigan State University, East Lansing, MI 48824, U.S.A
| | - M I Chilvers
- Department of Plant, Soil and Microbial Sciences, Michigan State University, East Lansing, MI 48824, U.S.A
- Genetics Graduate Program, Michigan State University, East Lansing, MI 48824, U.S.A
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12
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Butler KJ, Chen S, Smith JM, Wang X, Bent AF. Soybean Resistance Locus Rhg1 Confers Resistance to Multiple Cyst Nematodes in Diverse Plant Species. PHYTOPATHOLOGY 2019; 109:2107-2115. [PMID: 31403912 DOI: 10.1094/phyto-07-19-0225-r] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Cyst nematodes consistently threaten agricultural production, causing billions of dollars in losses globally. The Rhg1 (resistance to Heterodera glycines 1) locus of soybean (Glycine max) is the most popular resistance source used against soybean cyst nematodes (H. glycines). Rhg1 is a complex locus that has multiple repeats of an ≈30-kilobase segment carrying three genes that contribute to resistance. We investigated whether soybean Rhg1 could function in different plant families, conferring resistance to their respective cyst nematode parasites. Transgenic Arabidopsis thaliana and potato (Solanum tuberosum) plants expressing the three soybean Rhg1 genes were generated. The recipient Brassicaceae and Solanaceae plant species exhibited elevated resistance to H. schachtii and Globodera rostochiensis and to G. pallida, respectively. However, some negative consequences including reduced root growth and tuber biomass were observed upon Rhg1 expression in heterologous species. One of the genes at Rhg1 encodes a toxic version of an alpha-SNAP protein that has been demonstrated to interfere with vesicle trafficking. Using a transient expression assay for Nicotiana benthamiana, native Arabidopsis and potato alpha-SNAPs (soluble NSF [N-ethylamine sensitive factor] attachment protein) were found to compensate for the toxicity of soybean Rhg1 alpha-SNAP proteins. Hence, future manipulation of the balance between Rhg1 alpha-SNAP and the endogenous wild-type alpha-SNAPs (as well as the recently discovered soybean NSF-RAN07) may mitigate impacts of Rhg1 on plant productivity. The multispecies efficacy of soybean Rhg1 demonstrates that the encoded mechanisms can function across plant and cyst nematode species and offers a possible avenue for engineered resistance in diverse crop species.
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Affiliation(s)
- Katelyn J Butler
- Department of Plant Pathology, University of Wisconsin-Madison, Madison, WI 53706
- Department of Biology, Anderson University, Anderson, IN 46012
| | - Shiyan Chen
- Plant Pathology and Plant-Microbe Biology Section, School of Integrative Plant Science, Cornell University, Ithaca, NY 14853
| | - John M Smith
- Department of Plant Pathology, University of Wisconsin-Madison, Madison, WI 53706
| | - Xiaohong Wang
- Robert W. Holley Center for Agriculture and Health, U.S. Department of Agriculture-Agricultural Research Service, Ithaca, NY 14853
- Plant-Microbe Biology Section, School of Integrative Plant Science, Cornell University, Ithaca, NY 14853
| | - Andrew F Bent
- Department of Plant Pathology, University of Wisconsin-Madison, Madison, WI 53706
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13
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Lian Y, Wei H, Wang J, Lei C, Li H, Li J, Wu Y, Wang S, Zhang H, Wang T, Du P, Guo J, Lu W. Chromosome-level reference genome of X12, a highly virulent race of the soybean cyst nematode Heterodera glycines. Mol Ecol Resour 2019; 19:1637-1646. [PMID: 31339217 PMCID: PMC6899682 DOI: 10.1111/1755-0998.13068] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2019] [Revised: 07/09/2019] [Accepted: 07/15/2019] [Indexed: 12/22/2022]
Abstract
Soybean cyst nematode (SCN, Heterodera glycines) is a major pest of soybean that is spreading across major soybean production regions worldwide. Increased SCN virulence has recently been observed in both the United States and China. However, no study has reported a genome assembly for H. glycines at the chromosome scale. Herein, the first chromosome-level reference genome of X12, an unusual SCN race with high infection ability, is presented. Using whole-genome shotgun (WGS) sequencing, Pacific Biosciences (PacBio) sequencing, Illumina paired-end sequencing, 10X Genomics linked reads and high-throughput chromatin conformation capture (Hi-C) genome scaffolding techniques, a 141.01-megabase (Mb) assembled genome was obtained with scaffold and contig N50 sizes of 16.27 Mb and 330.54 kilobases (kb), respectively. The assembly showed high integrity and quality, with over 90% of Illumina reads mapped to the genome. The assembly quality was evaluated using Core Eukaryotic Genes Mapping Approach and Benchmarking Universal Single-Copy Orthologs. A total of 11,882 genes were predicted using de novo, homolog and RNAseq data generated from eggs, second-stage juveniles (J2), third-stage juveniles (J3) and fourth-stage juveniles (J4) of X12, and 79.0% of homologous sequences were annotated in the genome. These high-quality X12 genome data will provide valuable resources for research in a broad range of areas, including fundamental nematode biology, SCN-plant interactions and co-evolution, and also contribute to the development of technology for overall SCN management.
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Affiliation(s)
- Yun Lian
- Zhengzhou Subcenter of National Soybean Improvement Center/Key Laboratory of Oil Crops in Huanghuaihai Plains of the Ministry of Agriculture/Institute of Industrial CropsHenan Academy of Agricultural SciencesZhengzhouChina
| | - He Wei
- Zhengzhou Subcenter of National Soybean Improvement Center/Key Laboratory of Oil Crops in Huanghuaihai Plains of the Ministry of Agriculture/Institute of Industrial CropsHenan Academy of Agricultural SciencesZhengzhouChina
| | - Jinshe Wang
- Zhengzhou Subcenter of National Soybean Improvement Center/Key Laboratory of Oil Crops in Huanghuaihai Plains of the Ministry of Agriculture/Institute of Industrial CropsHenan Academy of Agricultural SciencesZhengzhouChina
| | - Chenfang Lei
- Zhengzhou Subcenter of National Soybean Improvement Center/Key Laboratory of Oil Crops in Huanghuaihai Plains of the Ministry of Agriculture/Institute of Industrial CropsHenan Academy of Agricultural SciencesZhengzhouChina
| | - Haichao Li
- Zhengzhou Subcenter of National Soybean Improvement Center/Key Laboratory of Oil Crops in Huanghuaihai Plains of the Ministry of Agriculture/Institute of Industrial CropsHenan Academy of Agricultural SciencesZhengzhouChina
| | - Jinying Li
- Zhengzhou Subcenter of National Soybean Improvement Center/Key Laboratory of Oil Crops in Huanghuaihai Plains of the Ministry of Agriculture/Institute of Industrial CropsHenan Academy of Agricultural SciencesZhengzhouChina
| | - Yongkang Wu
- Zhengzhou Subcenter of National Soybean Improvement Center/Key Laboratory of Oil Crops in Huanghuaihai Plains of the Ministry of Agriculture/Institute of Industrial CropsHenan Academy of Agricultural SciencesZhengzhouChina
| | - Shufeng Wang
- Zhengzhou Subcenter of National Soybean Improvement Center/Key Laboratory of Oil Crops in Huanghuaihai Plains of the Ministry of Agriculture/Institute of Industrial CropsHenan Academy of Agricultural SciencesZhengzhouChina
| | - Hui Zhang
- Zhengzhou Subcenter of National Soybean Improvement Center/Key Laboratory of Oil Crops in Huanghuaihai Plains of the Ministry of Agriculture/Institute of Industrial CropsHenan Academy of Agricultural SciencesZhengzhouChina
| | - Tingfeng Wang
- Zhengzhou Subcenter of National Soybean Improvement Center/Key Laboratory of Oil Crops in Huanghuaihai Plains of the Ministry of Agriculture/Institute of Industrial CropsHenan Academy of Agricultural SciencesZhengzhouChina
| | - Pei Du
- Zhengzhou Subcenter of National Soybean Improvement Center/Key Laboratory of Oil Crops in Huanghuaihai Plains of the Ministry of Agriculture/Institute of Industrial CropsHenan Academy of Agricultural SciencesZhengzhouChina
| | - Jianqiu Guo
- Luoyang Academy of Agriculture and Forestry SciencesLuoyangChina
| | - Weiguo Lu
- Zhengzhou Subcenter of National Soybean Improvement Center/Key Laboratory of Oil Crops in Huanghuaihai Plains of the Ministry of Agriculture/Institute of Industrial CropsHenan Academy of Agricultural SciencesZhengzhouChina
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14
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Patil GB, Lakhssassi N, Wan J, Song L, Zhou Z, Klepadlo M, Vuong TD, Stec AO, Kahil SS, Colantonio V, Valliyodan B, Rice JH, Piya S, Hewezi T, Stupar RM, Meksem K, Nguyen HT. Whole-genome re-sequencing reveals the impact of the interaction of copy number variants of the rhg1 and Rhg4 genes on broad-based resistance to soybean cyst nematode. PLANT BIOTECHNOLOGY JOURNAL 2019; 17:1595-1611. [PMID: 30688400 PMCID: PMC6662113 DOI: 10.1111/pbi.13086] [Citation(s) in RCA: 42] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/03/2018] [Revised: 01/09/2019] [Accepted: 01/10/2019] [Indexed: 05/19/2023]
Abstract
Soybean cyst nematode (SCN) is the most devastating plant-parasitic nematode. Most commercial soybean varieties with SCN resistance are derived from PI88788. Resistance derived from PI88788 is breaking down due to narrow genetic background and SCN population shift. PI88788 requires mainly the rhg1-b locus, while 'Peking' requires rhg1-a and Rhg4 for SCN resistance. In the present study, whole genome re-sequencing of 106 soybean lines was used to define the Rhg haplotypes and investigate their responses to the SCN HG-Types. The analysis showed a comprehensive profile of SNPs and copy number variations (CNV) at these loci. CNV of rhg1 (GmSNAP18) only contributed towards resistance in lines derived from PI88788 and 'Cloud'. At least 5.6 copies of the PI88788-type rhg1 were required to confer SCN resistance, regardless of the Rhg4 (GmSHMT08) haplotype. However, when the GmSNAP18 copies dropped below 5.6, a 'Peking'-type GmSHMT08 haplotype was required to ensure SCN resistance. This points to a novel mechanism of epistasis between GmSNAP18 and GmSHMT08 involving minimum requirements for copy number. The presence of more Rhg4 copies confers resistance to multiple SCN races. Moreover, transcript abundance of the GmSHMT08 in root tissue correlates with more copies of the Rhg4 locus, reinforcing SCN resistance. Finally, haplotype analysis of the GmSHMT08 and GmSNAP18 promoters inferred additional levels of the resistance mechanism. This is the first report revealing the genetic basis of broad-based resistance to SCN and providing new insight into epistasis, haplotype-compatibility, CNV, promoter variation and its impact on broad-based disease resistance in plants.
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Affiliation(s)
- Gunvant B. Patil
- Division of Plant SciencesUniversity of MissouriColumbiaMOUSA
- Department Agronomy and Plant GeneticsUniversity of MinnesotaSt. PaulMNUSA
| | - Naoufal Lakhssassi
- Department of Plant, Soil and Agricultural SystemsSouthern Illinois UniversityCarbondaleILUSA
| | - Jinrong Wan
- Division of Plant SciencesUniversity of MissouriColumbiaMOUSA
| | - Li Song
- Division of Plant SciencesUniversity of MissouriColumbiaMOUSA
| | - Zhou Zhou
- Department of Plant, Soil and Agricultural SystemsSouthern Illinois UniversityCarbondaleILUSA
| | | | - Tri D. Vuong
- Division of Plant SciencesUniversity of MissouriColumbiaMOUSA
| | - Adrian O. Stec
- Department Agronomy and Plant GeneticsUniversity of MinnesotaSt. PaulMNUSA
| | - Sondus S. Kahil
- Department of Plant, Soil and Agricultural SystemsSouthern Illinois UniversityCarbondaleILUSA
| | - Vincent Colantonio
- Department of Plant, Soil and Agricultural SystemsSouthern Illinois UniversityCarbondaleILUSA
| | - Babu Valliyodan
- Division of Plant SciencesUniversity of MissouriColumbiaMOUSA
| | - J. Hollis Rice
- Department of Plant SciencesUniversity of TennesseeKnoxvilleTNUSA
| | - Sarbottam Piya
- Department of Plant SciencesUniversity of TennesseeKnoxvilleTNUSA
| | - Tarek Hewezi
- Department of Plant SciencesUniversity of TennesseeKnoxvilleTNUSA
| | - Robert M. Stupar
- Department Agronomy and Plant GeneticsUniversity of MinnesotaSt. PaulMNUSA
| | - Khalid Meksem
- Department of Plant, Soil and Agricultural SystemsSouthern Illinois UniversityCarbondaleILUSA
| | - Henry T. Nguyen
- Division of Plant SciencesUniversity of MissouriColumbiaMOUSA
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15
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Ruark CL, Gardner M, Mitchum MG, Davis EL, Sit TL. Novel RNA viruses within plant parasitic cyst nematodes. PLoS One 2018; 13:e0193881. [PMID: 29509804 PMCID: PMC5839581 DOI: 10.1371/journal.pone.0193881] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2017] [Accepted: 02/20/2018] [Indexed: 02/06/2023] Open
Abstract
The study of invertebrate-and particularly nematode-viruses is emerging with the advancement of transcriptome sequencing. Five single-stranded RNA viruses have now been confirmed within the economically important soybean cyst nematode (SCN; Heterodera glycines). From previous research, we know these viruses to be widespread in greenhouse and field populations of SCN. Several of the SCN viruses were also confirmed within clover (H. trifolii) and beet (H. schachtii) cyst nematodes. In the presented study, we sequenced the transcriptomes of several inbred SCN populations and identified two previously undiscovered viral-like genomes. Both of these proposed viruses are negative-sense RNA viruses and have been named SCN nyami-like virus (NLV) and SCN bunya-like virus (BLV). Finally, we analyzed publicly available transcriptome data of two potato cyst nematode (PCN) species, Globodera pallida and G. rostochiensis. From these data, a third potential virus was discovered and called PCN picorna-like virus (PLV). PCN PLV is a positive-sense RNA virus, and to the best of our knowledge, is the first virus described within PCN. The presence of these novel viruses was confirmed via qRT-PCR, endpoint PCR, and Sanger sequencing with the exception of PCN PLV due to quarantine restrictions on the nematode host. While much work needs to be done to understand the biological and evolutionary significance of these viruses, they offer insight into nematode ecology and the possibility of novel nematode management strategies.
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Affiliation(s)
- Casey L. Ruark
- Department of Entomology and Plant Pathology, North Carolina State University, Thomas Hall, Raleigh, North Carolina, United States of America
| | - Michael Gardner
- Division of Plant Sciences and Bond Life Sciences Center, University of Missouri, 371H Bond Life Sciences Center, Columbia, Missouri, United States of America
| | - Melissa G. Mitchum
- Division of Plant Sciences and Bond Life Sciences Center, University of Missouri, 371H Bond Life Sciences Center, Columbia, Missouri, United States of America
| | - Eric L. Davis
- Department of Entomology and Plant Pathology, North Carolina State University, Thomas Hall, Raleigh, North Carolina, United States of America
| | - Tim L. Sit
- Department of Entomology and Plant Pathology, North Carolina State University, Thomas Hall, Raleigh, North Carolina, United States of America
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16
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Ruark CL, Koenning SR, Davis EL, Opperman CH, Lommel SA, Mitchum MG, Sit TL. Soybean cyst nematode culture collections and field populations from North Carolina and Missouri reveal high incidences of infection by viruses. PLoS One 2017; 12:e0171514. [PMID: 28141854 PMCID: PMC5283738 DOI: 10.1371/journal.pone.0171514] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2016] [Accepted: 01/20/2017] [Indexed: 11/18/2022] Open
Abstract
Five viruses were previously discovered infecting soybean cyst nematodes (SCN; Heterodera glycines) from greenhouse cultures maintained in Illinois. In this study, the five viruses [ScNV, ScPV, ScRV, ScTV, and SbCNV-5] were detected within SCN greenhouse and field populations from North Carolina (NC) and Missouri (MO). The prevalence and titers of viruses in SCN from 43 greenhouse cultures and 25 field populations were analyzed using qRT-PCR. Viral titers within SCN greenhouse cultures were similar throughout juvenile development, and the presence of viral anti-genomic RNAs within egg, second-stage juvenile (J2), and pooled J3 and J4 stages suggests active viral replication within the nematode. Viruses were found at similar or lower levels within field populations of SCN compared with greenhouse cultures of North Carolina populations. Five greenhouse cultures harbored all five known viruses whereas in most populations a mixture of fewer viruses was detected. In contrast, three greenhouse cultures of similar descent to one another did not possess any detectable viruses and primarily differed in location of the cultures (NC versus MO). Several of these SCN viruses were also detected in Heterodera trifolii (clover cyst) and Heterodera schachtii (beet cyst), but not the other cyst, root-knot, or reniform nematode species tested. Viruses were not detected within soybean host plant tissue. If nematode infection with viruses is truly more common than first considered, the potential influence on nematode biology, pathogenicity, ecology, and control warrants continued investigation.
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Affiliation(s)
- Casey L. Ruark
- Department of Entomology and Plant Pathology, North Carolina State University, 2510 Thomas Hall, Raleigh, North Carolina, United States of America
| | - Stephen R. Koenning
- Department of Entomology and Plant Pathology, North Carolina State University, 2510 Thomas Hall, Raleigh, North Carolina, United States of America
| | - Eric L. Davis
- Department of Entomology and Plant Pathology, North Carolina State University, 2510 Thomas Hall, Raleigh, North Carolina, United States of America
| | - Charles H. Opperman
- Department of Entomology and Plant Pathology, North Carolina State University, 2510 Thomas Hall, Raleigh, North Carolina, United States of America
| | - Steven A. Lommel
- Department of Entomology and Plant Pathology, North Carolina State University, 2510 Thomas Hall, Raleigh, North Carolina, United States of America
| | - Melissa G. Mitchum
- Division of Plant Sciences and Bond Life Sciences Center, University of Missouri, 371H Bond Life Sciences Center, Columbia, Missouri, United States of America
| | - Tim L. Sit
- Department of Entomology and Plant Pathology, North Carolina State University, 2510 Thomas Hall, Raleigh, North Carolina, United States of America
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