{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/71572"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/71572","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Activity Enhancement and the Mechanism of Glyphosate Action in Common Cocklebur","abstract":"Common cocklebur (Xanthium pensylvanicum Wallr.) root tips were used to investigate the mechanism of glyphosate {N-(phosphonomethyl)glycine} action. The incorporation but not the uptake of ('14)C-leucine was significantly decreased by 2 h after treatment. The incorporation declined steadily over a 32 h time course. The uptake of ('33)P by the roots was temporarily stimulated by glyphosate and, as a percent of total ('33)P taken up, there was decreased incorporation into RNA and DNA fraction by 8 h. The endogenous cytokinin content was measured in root tips at 4 and 12 h after glyphosate application. Glyphosate does not alter cytokinin accumulation by 12 h. Our results indicate that glyphosate may rapidly inhibit protein synthesis. Successive application of the cytokinin N('6)-((DELTA)('2)-isopentenyl) adenosine to the first leaf of cocklebur increased the uptake and altered the distribution of ('14)C-glyphosate that was applied 24 h later on the second cocklebur leaf. The results indicate that the exogenously applied cytokinin is taken up and may be transported to other areas in the plant. At 12 h after application there was significantly more ('14)C-glyphosate in the most rapidly expanding leaves, leaves three and four. To determine if cytokinins increased transpiration thereby increasing the uptake and altering the movement of glyphosate, leaf diffusive resistance was measured. At 24, 36 and 48 h after cytokinin application, there were no diffusive resistance differences in any leaf.","abstract_html":"Common cocklebur (Xanthium pensylvanicum Wallr.) root tips were used to investigate the mechanism of glyphosate {N-(phosphonomethyl)glycine} action. The incorporation but not the uptake of ('14)C-leucine was significantly decreased by 2 h after treatment. The incorporation declined steadily over a 32 h time course. The uptake of ('33)P by the roots was temporarily stimulated by glyphosate and, as a percent of total ('33)P taken up, there was decreased incorporation into RNA and DNA fraction by 8 h. The endogenous cytokinin content was measured in root tips at 4 and 12 h after glyphosate application. Glyphosate does not alter cytokinin accumulation by 12 h. Our results indicate that glyphosate may rapidly inhibit protein synthesis. Successive application of the cytokinin N('6)-((DELTA)('2)-isopentenyl) adenosine to the first leaf of cocklebur increased the uptake and altered the distribution of ('14)C-glyphosate that was applied 24 h later on the second cocklebur leaf. The results indicate that the exogenously applied cytokinin is taken up and may be transported to other areas in the plant. At 12 h after application there was significantly more ('14)C-glyphosate in the most rapidly expanding leaves, leaves three and four. To determine if cytokinins increased transpiration thereby increasing the uptake and altering the movement of glyphosate, leaf diffusive resistance was measured. At 24, 36 and 48 h after cytokinin application, there were no diffusive resistance differences in any leaf.","abstract_has_math":false,"creators":["Foley, Michael Edward"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Agronomy","degree_department":null,"school":null,"contributors":[],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2014,"date_issued":"2014-12-16T19:03:12Z","date_published":"2014-12-16T19:03:12Z","updated_at":"2026-07-22T22:26:05Z","subjects":["Agriculture, Agronomy"],"languages":[],"rights":[],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["(UMI)AAI8218468"],"render_values":[{"text":"(UMI)AAI8218468","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/71572","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:creator","label":"Author","values":["Foley, Michael Edward"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2014-12-16T19:03:12Z","10000-01-01","1982"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Agronomy"]},{"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":["Agriculture, Agronomy"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/71572","(UMI)AAI8218468"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Common cocklebur (Xanthium pensylvanicum Wallr.) root tips were used to investigate the mechanism of glyphosate {N-(phosphonomethyl)glycine} action. The incorporation but not the uptake of ('14)C-leucine was significantly decreased by 2 h after treatment. The incorporation declined steadily over a 32 h time course. The uptake of ('33)P by the roots was temporarily stimulated by glyphosate and, as a percent of total ('33)P taken up, there was decreased incorporation into RNA and DNA fraction by 8 h. The endogenous cytokinin content was measured in root tips at 4 and 12 h after glyphosate application. Glyphosate does not alter cytokinin accumulation by 12 h. Our results indicate that glyphosate may rapidly inhibit protein synthesis. Successive application of the cytokinin N('6)-((DELTA)('2)-isopentenyl) adenosine to the first leaf of cocklebur increased the uptake and altered the distribution of ('14)C-glyphosate that was applied 24 h later on the second cocklebur leaf. The results indicate that the exogenously applied cytokinin is taken up and may be transported to other areas in the plant. At 12 h after application there was significantly more ('14)C-glyphosate in the most rapidly expanding leaves, leaves three and four. To determine if cytokinins increased transpiration thereby increasing the uptake and altering the movement of glyphosate, leaf diffusive resistance was measured. At 24, 36 and 48 h after cytokinin application, there were no diffusive resistance differences in any leaf.","Made available in DSpace on 2014-12-16T19:03:12Z (GMT). No. of bitstreams: 1 8218468.pdf: 2335426 bytes, checksum: 2e637296493446ae3b029f6c57f1fe8e (MD5) Previous issue date: 1982","Embargo set by: Seth Robbins for item 71738 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs","Restricted to the U of I community indefinitely during batch ingest of legacy ETDs","U of I Only","69 p.","Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1982."]},{"key":"dc:title","label":"Title","values":["Activity Enhancement and the Mechanism of Glyphosate Action in Common Cocklebur"]}]}],"canonical_facts":{"dc:creator":["Foley, Michael Edward"],"dc:date":["2014-12-16T19:03:12Z","10000-01-01","1982"],"dc:description":["Common cocklebur (Xanthium pensylvanicum Wallr.) root tips were used to investigate the mechanism of glyphosate {N-(phosphonomethyl)glycine} action. The incorporation but not the uptake of ('14)C-leucine was significantly decreased by 2 h after treatment. The incorporation declined steadily over a 32 h time course. The uptake of ('33)P by the roots was temporarily stimulated by glyphosate and, as a percent of total ('33)P taken up, there was decreased incorporation into RNA and DNA fraction by 8 h. The endogenous cytokinin content was measured in root tips at 4 and 12 h after glyphosate application. Glyphosate does not alter cytokinin accumulation by 12 h. Our results indicate that glyphosate may rapidly inhibit protein synthesis. Successive application of the cytokinin N('6)-((DELTA)('2)-isopentenyl) adenosine to the first leaf of cocklebur increased the uptake and altered the distribution of ('14)C-glyphosate that was applied 24 h later on the second cocklebur leaf. The results indicate that the exogenously applied cytokinin is taken up and may be transported to other areas in the plant. At 12 h after application there was significantly more ('14)C-glyphosate in the most rapidly expanding leaves, leaves three and four. To determine if cytokinins increased transpiration thereby increasing the uptake and altering the movement of glyphosate, leaf diffusive resistance was measured. At 24, 36 and 48 h after cytokinin application, there were no diffusive resistance differences in any leaf.","Made available in DSpace on 2014-12-16T19:03:12Z (GMT). No. of bitstreams: 1 8218468.pdf: 2335426 bytes, checksum: 2e637296493446ae3b029f6c57f1fe8e (MD5) Previous issue date: 1982","Embargo set by: Seth Robbins for item 71738 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs","Restricted to the U of I community indefinitely during batch ingest of legacy ETDs","U of I Only","69 p.","Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1982."],"dc:identifier":["http://hdl.handle.net/2142/71572","(UMI)AAI8218468"],"dc:subject":["Agriculture, Agronomy"],"dc:title":["Activity Enhancement and the Mechanism of Glyphosate Action in Common Cocklebur"],"dc:type":["text"],"thesis:degree_discipline":["Agronomy"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:26:05Z"}