{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/115580"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/115580","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Nematode resistance in perennial glycine species, genetic mapping of resistance in g. Latifolia to Meloidogyne incognita, and analysis of nematode communities in Illinois","abstract":"Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2024-05-01","abstract_html":"Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2024-05-01","abstract_has_math":false,"creators":["Han, Jaeyeong"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Crop Sciences","degree_department":null,"school":null,"contributors":["Hartman, Glen L","Schroeder, Nathan E","Domier, Leslie L","Ugarte, Carmen M","Lambert, Kris N"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2022,"date_issued":"2022-05","date_published":"2022-05","updated_at":"2026-07-22T22:24:54Z","subjects":["nematode","root-knot nematode","soybean","perennial Glycine"],"languages":["en","eng"],"rights":["Copyright 2022 Jaeyeong Han"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://hdl.handle.net/2142/115580","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Hartman, Glen L","Schroeder, Nathan E","Domier, Leslie L","Ugarte, Carmen M","Lambert, Kris N"]},{"key":"dc:creator","label":"Author","values":["Han, Jaeyeong"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2022-05","2022-04-22"]},{"key":"dc:type","label":"Dc Type","values":["text","Thesis"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Crop Sciences"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Dissertation"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Ph.D."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["nematode","root-knot nematode","soybean","perennial Glycine"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en","eng"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2022 Jaeyeong Han"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["https://hdl.handle.net/2142/115580"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2024-05-01","The student, Jaeyeong Han, accepted the attached license on 2022-04-19 at 11:33.","The student, Jaeyeong Han, submitted this Dissertation for approval on 2022-04-19 at 11:43.","This Dissertation was approved for publication on 2022-04-22 at 10:41.","DSpace SAF Submission Ingestion Package generated from Vireo submission #17797 on 2022-11-11 at 12:06:10","Southern root-knot nematode (Meloidogyne incognita), reniform nematode (Rotylenchulus reniformis), and lesion nematode (Pratylenchus penetrans) cause substantial yield losses to soybean (Glycine max). Deploying host resistance is considered a sustainable option to control nematodes, but soybean resistance to these nematode species may be overcome by more aggressive populations or high densities of the nematodes. Wild perennial relatives of soybean have unique genetic resources that can be used to enhance nematode resistance traits in soybean. In addition to these three species of nematodes, there are diverse plant-parasitic and free-living nematodes that are known to occur in soybean and corn fields in Illinois. Though it is important to assess the potential risk for yield losses due to these pathogens, there are no recent published surveys of plant-parasitic nematodes in Illinois. This dissertation explores the potential of wild perennial Glycine species to enhance disease resistance to the three nematode species and determine the distribution and population densities of nematode communities in organic soybean fields and non-organic corn fields in Illinois. I demonstrated the potential of perennial Glycine species to harbor resistance to Meloidogyne incognita and Rotylenchulus reniformis. Among eighteen accessions tested, three accessions of G. clandestina and G. tomentella had resistance to both nematode species. In contrast, no resistance to P. penetrans was recorded in any perennial Glycine species. To identify a genetic region controlling M. incognita resistance in perennial Glycine species, I used previously established G. latifolia recombinant inbred lines and 1,419 single nucleotide polymorphism markers. I detected a single locus on chromosome 13 significantly associated with M. incognita resistance, explaining 32.7% of phenotypic variance. Interestingly, the locus was syntenic with a locus on G. max chromosome 13, previously found associated with resistance to multiple Meloidogyne species and other non-nematode pathogens that infect soybean. From field surveys of nematodes in Illinois organic soybean fields, I found six plant-parasitic nematode taxa, including spiral (Helicotylenchus spp.), lesion (Pratylenchus spp.), cyst (Heteroderidae), stunt (Tylenchorhynchus spp.), dagger (Xiphinema spp.), and pin nematodes (Paratylenchus spp.). Among the taxa, 62%, 40%, and 25% of spiral, lesion, and dagger nematode-positive samples were above previously established damage threshold levels in some fields. Organic fields under long-term rotation with soybean supported more total nematode and cyst nematode abundances in the summer sampling season and had more structured food web in the fall sampling season compared with fields under short-term rotation with soybean. In Illinois corn fields, I found a total of 10 plant-parasitic nematode taxa: spiral, lesion, cyst, stunt, lance (Hoplolaimus spp.), dagger, pin, needle (Longidorus spp.), stubby-root (Trichodoridae), and ring nematodes (Criconematidae). Among the 10 nematode taxa, 7.1%, 4.1%, and 2.3% of lesion, spiral, and lance nematode-positive samples exceeded estimated damage thresholds in some fields. Overall, this dissertation identified novel nematode resistance sources from perennial Glycine species and a locus associated with M. incognita resistance in G. latifolia, and report diversity and populations of plant-parasitic and free-living nematodes in Illinois organic soybean and non-organic corn production fields."]},{"key":"dc:format","label":"Dc Format","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Nematode resistance in perennial glycine species, genetic mapping of resistance in g. Latifolia to Meloidogyne incognita, and analysis of nematode communities in Illinois"]}]}],"canonical_facts":{"dc:contributor":["Hartman, Glen L","Schroeder, Nathan E","Domier, Leslie L","Ugarte, Carmen M","Lambert, Kris N"],"dc:creator":["Han, Jaeyeong"],"dc:date":["2022-05","2022-04-22"],"dc:description":["Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2024-05-01","The student, Jaeyeong Han, accepted the attached license on 2022-04-19 at 11:33.","The student, Jaeyeong Han, submitted this Dissertation for approval on 2022-04-19 at 11:43.","This Dissertation was approved for publication on 2022-04-22 at 10:41.","DSpace SAF Submission Ingestion Package generated from Vireo submission #17797 on 2022-11-11 at 12:06:10","Southern root-knot nematode (Meloidogyne incognita), reniform nematode (Rotylenchulus reniformis), and lesion nematode (Pratylenchus penetrans) cause substantial yield losses to soybean (Glycine max). Deploying host resistance is considered a sustainable option to control nematodes, but soybean resistance to these nematode species may be overcome by more aggressive populations or high densities of the nematodes. Wild perennial relatives of soybean have unique genetic resources that can be used to enhance nematode resistance traits in soybean. In addition to these three species of nematodes, there are diverse plant-parasitic and free-living nematodes that are known to occur in soybean and corn fields in Illinois. Though it is important to assess the potential risk for yield losses due to these pathogens, there are no recent published surveys of plant-parasitic nematodes in Illinois. This dissertation explores the potential of wild perennial Glycine species to enhance disease resistance to the three nematode species and determine the distribution and population densities of nematode communities in organic soybean fields and non-organic corn fields in Illinois. I demonstrated the potential of perennial Glycine species to harbor resistance to Meloidogyne incognita and Rotylenchulus reniformis. Among eighteen accessions tested, three accessions of G. clandestina and G. tomentella had resistance to both nematode species. In contrast, no resistance to P. penetrans was recorded in any perennial Glycine species. To identify a genetic region controlling M. incognita resistance in perennial Glycine species, I used previously established G. latifolia recombinant inbred lines and 1,419 single nucleotide polymorphism markers. I detected a single locus on chromosome 13 significantly associated with M. incognita resistance, explaining 32.7% of phenotypic variance. Interestingly, the locus was syntenic with a locus on G. max chromosome 13, previously found associated with resistance to multiple Meloidogyne species and other non-nematode pathogens that infect soybean. From field surveys of nematodes in Illinois organic soybean fields, I found six plant-parasitic nematode taxa, including spiral (Helicotylenchus spp.), lesion (Pratylenchus spp.), cyst (Heteroderidae), stunt (Tylenchorhynchus spp.), dagger (Xiphinema spp.), and pin nematodes (Paratylenchus spp.). Among the taxa, 62%, 40%, and 25% of spiral, lesion, and dagger nematode-positive samples were above previously established damage threshold levels in some fields. Organic fields under long-term rotation with soybean supported more total nematode and cyst nematode abundances in the summer sampling season and had more structured food web in the fall sampling season compared with fields under short-term rotation with soybean. In Illinois corn fields, I found a total of 10 plant-parasitic nematode taxa: spiral, lesion, cyst, stunt, lance (Hoplolaimus spp.), dagger, pin, needle (Longidorus spp.), stubby-root (Trichodoridae), and ring nematodes (Criconematidae). Among the 10 nematode taxa, 7.1%, 4.1%, and 2.3% of lesion, spiral, and lance nematode-positive samples exceeded estimated damage thresholds in some fields. Overall, this dissertation identified novel nematode resistance sources from perennial Glycine species and a locus associated with M. incognita resistance in G. latifolia, and report diversity and populations of plant-parasitic and free-living nematodes in Illinois organic soybean and non-organic corn production fields."],"dc:format":["application/pdf"],"dc:identifier":["https://hdl.handle.net/2142/115580"],"dc:language":["en","eng"],"dc:rights":["Copyright 2022 Jaeyeong Han"],"dc:subject":["nematode","root-knot nematode","soybean","perennial Glycine"],"dc:title":["Nematode resistance in perennial glycine species, genetic mapping of resistance in g. Latifolia to Meloidogyne incognita, and analysis of nematode communities in Illinois"],"dc:type":["text","Thesis"],"thesis:degree_discipline":["Crop Sciences"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:24:54Z"}