{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/19597"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/19597","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Characterization of acifluorfen selectivity mechanisms in tomato and related Lycopersicon species","abstract":"Fourteen tomato (Lycopersicon esculentum) genotypes, Eastern Black nightshade, and 35 wild Lycopersicon accessions were screened for tolerance to acifluorfen. Response to acifluorfen was not species specific, but in general, the cultivated tomato varieties were slightly more tolerant than the wild accessions. From the genotypes initially screened, 15 with differential tolerance were chosen for further study depending on their fresh weight response to aciflourfen as well as their vigor rating after treatment. The relationship of trichome and stomate density, quantity of epicuticular wax and cuticle, and wax composition to acifluorfen tolerance was determined. There was no correlation between trichome density and acifluorfen tolerance or susceptibility, however, an inverse relationship between stomate density and tolerance was observed. Amount and composition of the epicuticular wax and the cuticle differed among genotypes, but did not correlate to acifluorfen tolerance.","abstract_html":"Fourteen tomato (Lycopersicon esculentum) genotypes, Eastern Black nightshade, and 35 wild Lycopersicon accessions were screened for tolerance to acifluorfen. Response to acifluorfen was not species specific, but in general, the cultivated tomato varieties were slightly more tolerant than the wild accessions. From the genotypes initially screened, 15 with differential tolerance were chosen for further study depending on their fresh weight response to aciflourfen as well as their vigor rating after treatment. The relationship of trichome and stomate density, quantity of epicuticular wax and cuticle, and wax composition to acifluorfen tolerance was determined. There was no correlation between trichome density and acifluorfen tolerance or susceptibility, however, an inverse relationship between stomate density and tolerance was observed. Amount and composition of the epicuticular wax and the cuticle differed among genotypes, but did not correlate to acifluorfen tolerance.","abstract_has_math":false,"creators":["Ricotta, Jacqueline Anne"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Crop Sciences","degree_department":null,"school":null,"contributors":["Masiunas, John B."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2011,"date_issued":"2011-05-07T12:12:34Z","date_published":"2011-05-07T12:12:34Z","updated_at":"2026-07-22T22:25:14Z","subjects":["Biology, Plant Physiology"],"languages":["eng"],"rights":["Copyright 1990 Ricotta, Jacqueline Anne"],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["AAI9114387","(UMI)AAI9114387"],"render_values":[{"text":"AAI9114387","href":null,"code":true},{"text":"(UMI)AAI9114387","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/19597","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Masiunas, John B."]},{"key":"dc:creator","label":"Author","values":["Ricotta, Jacqueline Anne"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2011-05-07T12:12:34Z","10000-01-01","1990"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"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":["Biology, Plant Physiology"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["eng"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 1990 Ricotta, Jacqueline Anne"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/19597","AAI9114387","(UMI)AAI9114387"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Fourteen tomato (Lycopersicon esculentum) genotypes, Eastern Black nightshade, and 35 wild Lycopersicon accessions were screened for tolerance to acifluorfen. Response to acifluorfen was not species specific, but in general, the cultivated tomato varieties were slightly more tolerant than the wild accessions. From the genotypes initially screened, 15 with differential tolerance were chosen for further study depending on their fresh weight response to aciflourfen as well as their vigor rating after treatment. The relationship of trichome and stomate density, quantity of epicuticular wax and cuticle, and wax composition to acifluorfen tolerance was determined. There was no correlation between trichome density and acifluorfen tolerance or susceptibility, however, an inverse relationship between stomate density and tolerance was observed. Amount and composition of the epicuticular wax and the cuticle differed among genotypes, but did not correlate to acifluorfen tolerance.","Further investigations were conducted to determine the mechanism of selectivity within the genus. Absorption of $\\sp{14}$C acifluorfen ranged from 4 to 14% after 48 hours, and 6 to 32% after one week, but uptake was not greater in susceptible genotypes. Translocation was minimal, and no metabolism occurred in any of the genotypes. Assays of chlororphyll content revealed differences among genotypes in amounts of chl A, chl B and total chl, but chlorophyll levels did not correlate to tolerance or susceptibility. Genotypes were screened for cross-tolerance to paraquat. All were susceptible, implying that enzymatic free radical protectant systems were not involved in acifluorfen tolerance. The toxic oxygen scavenger ascorbate was quantified. Tolerant genotypes Bellstar, Nova, and 204976 (an L. esculentum x L. pimpinellifolium hybrid) had lower levels of ascorbate than the susceptible genotypes, suggesting the involvement of antioxidants in acifluorfen selectivity in the Lycopersicon genus.","Made available in DSpace on 2011-05-07T12:12:34Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9114387.pdf: 3408299 bytes, checksum: 986c3acad3b6b2ce6a15f8169fd6b230 (MD5) Previous issue date: 1990","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:38:07Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:15:50-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: ETDs are only available to UIUC Users without author permission","ETDs are only available to UIUC Users without author permission","U of I Only"]},{"key":"dc:title","label":"Title","values":["Characterization of acifluorfen selectivity mechanisms in tomato and related Lycopersicon species"]}]}],"canonical_facts":{"dc:contributor":["Masiunas, John B."],"dc:creator":["Ricotta, Jacqueline Anne"],"dc:date":["2011-05-07T12:12:34Z","10000-01-01","1990"],"dc:description":["Fourteen tomato (Lycopersicon esculentum) genotypes, Eastern Black nightshade, and 35 wild Lycopersicon accessions were screened for tolerance to acifluorfen. Response to acifluorfen was not species specific, but in general, the cultivated tomato varieties were slightly more tolerant than the wild accessions. From the genotypes initially screened, 15 with differential tolerance were chosen for further study depending on their fresh weight response to aciflourfen as well as their vigor rating after treatment. The relationship of trichome and stomate density, quantity of epicuticular wax and cuticle, and wax composition to acifluorfen tolerance was determined. There was no correlation between trichome density and acifluorfen tolerance or susceptibility, however, an inverse relationship between stomate density and tolerance was observed. Amount and composition of the epicuticular wax and the cuticle differed among genotypes, but did not correlate to acifluorfen tolerance.","Further investigations were conducted to determine the mechanism of selectivity within the genus. Absorption of $\\sp{14}$C acifluorfen ranged from 4 to 14% after 48 hours, and 6 to 32% after one week, but uptake was not greater in susceptible genotypes. Translocation was minimal, and no metabolism occurred in any of the genotypes. Assays of chlororphyll content revealed differences among genotypes in amounts of chl A, chl B and total chl, but chlorophyll levels did not correlate to tolerance or susceptibility. Genotypes were screened for cross-tolerance to paraquat. All were susceptible, implying that enzymatic free radical protectant systems were not involved in acifluorfen tolerance. The toxic oxygen scavenger ascorbate was quantified. Tolerant genotypes Bellstar, Nova, and 204976 (an L. esculentum x L. pimpinellifolium hybrid) had lower levels of ascorbate than the susceptible genotypes, suggesting the involvement of antioxidants in acifluorfen selectivity in the Lycopersicon genus.","Made available in DSpace on 2011-05-07T12:12:34Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9114387.pdf: 3408299 bytes, checksum: 986c3acad3b6b2ce6a15f8169fd6b230 (MD5) Previous issue date: 1990","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:38:07Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:15:50-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: ETDs are only available to UIUC Users without author permission","ETDs are only available to UIUC Users without author permission","U of I Only"],"dc:identifier":["http://hdl.handle.net/2142/19597","AAI9114387","(UMI)AAI9114387"],"dc:language":["eng"],"dc:rights":["Copyright 1990 Ricotta, Jacqueline Anne"],"dc:subject":["Biology, Plant Physiology"],"dc:title":["Characterization of acifluorfen selectivity mechanisms in tomato and related Lycopersicon species"],"dc:type":["text"],"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":"2026-07-22T22:25:14Z"}