{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/22305"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/22305","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Evolutionary response of plants to increased UV-B radiation: Greenhouse and field studies with Arabidopsis thaliana","abstract":"ETDs are only available to UIUC Users without author permission","abstract_html":"ETDs are only available to UIUC Users without author permission","abstract_has_math":false,"creators":["Trumbull, Vernon Lyle"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Biology","degree_department":null,"school":null,"contributors":["Paige, Ken N."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2011,"date_issued":"2011-05-07T13:35:38Z","date_published":"2011-05-07T13:35:38Z","updated_at":"2026-07-22T22:25:19Z","subjects":["Biology, Botany","Biology, Ecology","Biology, Plant Physiology"],"languages":["eng"],"rights":["Copyright 1996 Trumbull, Vernon Lyle"],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["9780591089646","AAI9702690","(UMI)AAI9702690"],"render_values":[{"text":"9780591089646","href":null,"code":true},{"text":"AAI9702690","href":null,"code":true},{"text":"(UMI)AAI9702690","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/22305","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Paige, Ken N."]},{"key":"dc:creator","label":"Author","values":["Trumbull, Vernon Lyle"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2011-05-07T13:35:38Z","10000-01-01","1996"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Biology"]},{"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, Botany","Biology, Ecology","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 1996 Trumbull, Vernon Lyle"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["9780591089646","AAI9702690","(UMI)AAI9702690","http://hdl.handle.net/2142/22305"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["ETDs are only available to UIUC Users without author permission","U of I Only","Two approaches were used to examine the evolution of UV-B tolerance in Arabidopsis thaliana. In the first approach, I studied adaptation to past levels of UV-B radiation by examining the impact of enhanced UV-B radiation on two ecotypes of A. thaliana that originated from very different natural UV-B environments. The Libyan ecotype (from a high UV-B environment) showed no UV-B induced damage to rosette mass or the germination success of seeds harvested from irradiated plants. The Norwegian ecotype (from a low UV-B environment) showed a significant reduction in these variables in response to enhanced UV-B. The concentration of kaempferol, a putative UV-B protective filter, increased in the Libyan ecotype by 81% compared to a 22% increase in the Norwegian ecotype.","In the second approach, both greenhouse and field experiments were done to measure variation for UV-B sensitivity in a natural population of A. thaliana. This population consists of four morphologically and genetically discrete groups. There was no genetic variation for UV-B tolerance in two of the three greenhouse experiments. In the 1993-94 field study, we found genetic variation for UV-B sensitivity in this population. The high UV-B treatment caused a change in fruit number (relative to ambient UV-B) ranging from an increase of 30% (genotype B) to a decrease of 45% (genotype D). The seeds from this experiment were allowed to disperse naturally and a random sample of the F, rosettes were identified using RAPD markers. The relative frequency of genotype D in the F, generation was reduced by 34%. Given that genotype D comprises greater than 90% of this population, projected increases in solar UV-B may have significant consequences for the genetic structure of this population. However, evidence from the 1994-95 experiment indicates that UV-B selection may be variable between years. In this study, there was no genetic variation for UV-B sensitivity but the high UV-B treatment did cause an overall reduction in fruit number ($-$19%). This year to year variation in UV-B selection may act to maintain genetic variation for UV-B tolerance within this population.","Made available in DSpace on 2011-05-07T13:35:38Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9702690.pdf: 4376820 bytes, checksum: 208e502776252476c9fb7e226bdd06a2 (MD5) Previous issue date: 1996","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:56:43Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:26:32-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: ETDs are only available to UIUC Users without author permission"]},{"key":"dc:title","label":"Title","values":["Evolutionary response of plants to increased UV-B radiation: Greenhouse and field studies with Arabidopsis thaliana"]}]}],"canonical_facts":{"dc:contributor":["Paige, Ken N."],"dc:creator":["Trumbull, Vernon Lyle"],"dc:date":["2011-05-07T13:35:38Z","10000-01-01","1996"],"dc:description":["ETDs are only available to UIUC Users without author permission","U of I Only","Two approaches were used to examine the evolution of UV-B tolerance in Arabidopsis thaliana. In the first approach, I studied adaptation to past levels of UV-B radiation by examining the impact of enhanced UV-B radiation on two ecotypes of A. thaliana that originated from very different natural UV-B environments. The Libyan ecotype (from a high UV-B environment) showed no UV-B induced damage to rosette mass or the germination success of seeds harvested from irradiated plants. The Norwegian ecotype (from a low UV-B environment) showed a significant reduction in these variables in response to enhanced UV-B. The concentration of kaempferol, a putative UV-B protective filter, increased in the Libyan ecotype by 81% compared to a 22% increase in the Norwegian ecotype.","In the second approach, both greenhouse and field experiments were done to measure variation for UV-B sensitivity in a natural population of A. thaliana. This population consists of four morphologically and genetically discrete groups. There was no genetic variation for UV-B tolerance in two of the three greenhouse experiments. In the 1993-94 field study, we found genetic variation for UV-B sensitivity in this population. The high UV-B treatment caused a change in fruit number (relative to ambient UV-B) ranging from an increase of 30% (genotype B) to a decrease of 45% (genotype D). The seeds from this experiment were allowed to disperse naturally and a random sample of the F, rosettes were identified using RAPD markers. The relative frequency of genotype D in the F, generation was reduced by 34%. Given that genotype D comprises greater than 90% of this population, projected increases in solar UV-B may have significant consequences for the genetic structure of this population. However, evidence from the 1994-95 experiment indicates that UV-B selection may be variable between years. In this study, there was no genetic variation for UV-B sensitivity but the high UV-B treatment did cause an overall reduction in fruit number ($-$19%). This year to year variation in UV-B selection may act to maintain genetic variation for UV-B tolerance within this population.","Made available in DSpace on 2011-05-07T13:35:38Z (GMT). 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