{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/21844"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/21844","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Variation for root and shoot growth among wheat cultivars and the effects of barley yellow dwarf virus on growth","abstract":"Studies were conducted on eight soft red winter wheat cultivars to evaluate differences in root growth, to evaluate the effects of barley yellow dwarf virus (BYDV) on root and shoot growth, and to study the effects of a plant growth regulator on root growth of healthy and BYDV infected plants. Cultivars evaluated were Caldwell, Cardinal, Clark, Howell, IL 87-2834, Tyler, and Pioneer$\\sp\\circler$ brands 2548 and 2555. Studies on root growth were conducted in the greenhouse in an aeroponic mist box. Differences in root growth were found for root dry weight, root length, numbers of seminal and adventitious roots, and root to shoot ratio. Infection with BYDV caused noticeable symptoms in the roots prior to the shoots. Root length and root to shoot ratios were decreased by infection, but number of adventitious roots was often increased by infection. A plant growth regulator, PGR-IV, had little measurable effect on root growth of BYDV infected plants, but it increased root dry weight, number of lateral roots, and lateral root length in healthy plants. Effects of the virus on yield and growth rate were determined in the field in drill-planted plots. Plots were inoculated in the fall when seedlings were in the two leaf stage. BYDV-induced grain yield reductions of 21% to 36% were measured. Most yield loss resulted from a reduction in kernels per head. None of the cultivars tested exhibited a high level of tolerance to the virus and the highest yielding cultivars were often the ones that exhibited the highest grain yield reductions. Even so, highest yielding cultivars under control conditions were usually the highest yielding under BYDV-inoculated conditions. Growth rate throughout the season was measured by fitting the Richards function to dry weight data collected on a weekly basis. The reduced biomass production under inoculated conditions resulted from reduced relative growth rates rather than from a shortened period of growth. Relative growth rate was not related to a cultivars tolerance based on grain yield reduction, but relative growth rate in the early part of the season was positively related to grain yield per se under BYDV infection.","abstract_html":"Studies were conducted on eight soft red winter wheat cultivars to evaluate differences in root growth, to evaluate the effects of barley yellow dwarf virus (BYDV) on root and shoot growth, and to study the effects of a plant growth regulator on root growth of healthy and BYDV infected plants. Cultivars evaluated were Caldwell, Cardinal, Clark, Howell, IL 87-2834, Tyler, and Pioneer$\\sp\\circler$ brands 2548 and 2555. Studies on root growth were conducted in the greenhouse in an aeroponic mist box. Differences in root growth were found for root dry weight, root length, numbers of seminal and adventitious roots, and root to shoot ratio. Infection with BYDV caused noticeable symptoms in the roots prior to the shoots. Root length and root to shoot ratios were decreased by infection, but number of adventitious roots was often increased by infection. A plant growth regulator, PGR-IV, had little measurable effect on root growth of BYDV infected plants, but it increased root dry weight, number of lateral roots, and lateral root length in healthy plants. Effects of the virus on yield and growth rate were determined in the field in drill-planted plots. Plots were inoculated in the fall when seedlings were in the two leaf stage. BYDV-induced grain yield reductions of 21% to 36% were measured. Most yield loss resulted from a reduction in kernels per head. None of the cultivars tested exhibited a high level of tolerance to the virus and the highest yielding cultivars were often the ones that exhibited the highest grain yield reductions. Even so, highest yielding cultivars under control conditions were usually the highest yielding under BYDV-inoculated conditions. Growth rate throughout the season was measured by fitting the Richards function to dry weight data collected on a weekly basis. The reduced biomass production under inoculated conditions resulted from reduced relative growth rates rather than from a shortened period of growth. Relative growth rate was not related to a cultivars tolerance based on grain yield reduction, but relative growth rate in the early part of the season was positively related to grain yield per se under BYDV infection.","abstract_has_math":true,"creators":["Hoffman, Thomas Karl"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Crop Sciences","degree_department":null,"school":null,"contributors":["Kolb, Frederic L."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2011,"date_issued":"2011-05-07T13:20:53Z","date_published":"2011-05-07T13:20:53Z","updated_at":"2026-07-22T22:25:18Z","subjects":["Agriculture, Agronomy","Agriculture, Plant Pathology"],"languages":["eng"],"rights":["Copyright 1996 Hoffman, Thomas Karl"],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["(UMI)AAI9712308","9780591198980","AAI9712308"],"render_values":[{"text":"(UMI)AAI9712308","href":null,"code":true},{"text":"9780591198980","href":null,"code":true},{"text":"AAI9712308","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/21844","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Kolb, Frederic L."]},{"key":"dc:creator","label":"Author","values":["Hoffman, Thomas Karl"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2011-05-07T13:20:53Z","10000-01-01","1996"]},{"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":["Agriculture, Agronomy","Agriculture, Plant Pathology"]}]},{"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 Hoffman, Thomas Karl"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["(UMI)AAI9712308","http://hdl.handle.net/2142/21844","9780591198980","AAI9712308"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Studies were conducted on eight soft red winter wheat cultivars to evaluate differences in root growth, to evaluate the effects of barley yellow dwarf virus (BYDV) on root and shoot growth, and to study the effects of a plant growth regulator on root growth of healthy and BYDV infected plants. Cultivars evaluated were Caldwell, Cardinal, Clark, Howell, IL 87-2834, Tyler, and Pioneer$\\sp\\circler$ brands 2548 and 2555. Studies on root growth were conducted in the greenhouse in an aeroponic mist box. Differences in root growth were found for root dry weight, root length, numbers of seminal and adventitious roots, and root to shoot ratio. Infection with BYDV caused noticeable symptoms in the roots prior to the shoots. Root length and root to shoot ratios were decreased by infection, but number of adventitious roots was often increased by infection. A plant growth regulator, PGR-IV, had little measurable effect on root growth of BYDV infected plants, but it increased root dry weight, number of lateral roots, and lateral root length in healthy plants. Effects of the virus on yield and growth rate were determined in the field in drill-planted plots. Plots were inoculated in the fall when seedlings were in the two leaf stage. BYDV-induced grain yield reductions of 21% to 36% were measured. Most yield loss resulted from a reduction in kernels per head. None of the cultivars tested exhibited a high level of tolerance to the virus and the highest yielding cultivars were often the ones that exhibited the highest grain yield reductions. Even so, highest yielding cultivars under control conditions were usually the highest yielding under BYDV-inoculated conditions. Growth rate throughout the season was measured by fitting the Richards function to dry weight data collected on a weekly basis. The reduced biomass production under inoculated conditions resulted from reduced relative growth rates rather than from a shortened period of growth. Relative growth rate was not related to a cultivars tolerance based on grain yield reduction, but relative growth rate in the early part of the season was positively related to grain yield per se under BYDV infection.","Made available in DSpace on 2011-05-07T13:20:53Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9712308.pdf: 5127776 bytes, checksum: f4b32ce5a3bba4f90e2ceb0ae3f788a5 (MD5) Previous issue date: 1996","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:53:35Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:24:48-05:00 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":["Variation for root and shoot growth among wheat cultivars and the effects of barley yellow dwarf virus on growth"]}]}],"canonical_facts":{"dc:contributor":["Kolb, Frederic L."],"dc:creator":["Hoffman, Thomas Karl"],"dc:date":["2011-05-07T13:20:53Z","10000-01-01","1996"],"dc:description":["Studies were conducted on eight soft red winter wheat cultivars to evaluate differences in root growth, to evaluate the effects of barley yellow dwarf virus (BYDV) on root and shoot growth, and to study the effects of a plant growth regulator on root growth of healthy and BYDV infected plants. Cultivars evaluated were Caldwell, Cardinal, Clark, Howell, IL 87-2834, Tyler, and Pioneer$\\sp\\circler$ brands 2548 and 2555. Studies on root growth were conducted in the greenhouse in an aeroponic mist box. Differences in root growth were found for root dry weight, root length, numbers of seminal and adventitious roots, and root to shoot ratio. Infection with BYDV caused noticeable symptoms in the roots prior to the shoots. Root length and root to shoot ratios were decreased by infection, but number of adventitious roots was often increased by infection. A plant growth regulator, PGR-IV, had little measurable effect on root growth of BYDV infected plants, but it increased root dry weight, number of lateral roots, and lateral root length in healthy plants. Effects of the virus on yield and growth rate were determined in the field in drill-planted plots. Plots were inoculated in the fall when seedlings were in the two leaf stage. BYDV-induced grain yield reductions of 21% to 36% were measured. Most yield loss resulted from a reduction in kernels per head. None of the cultivars tested exhibited a high level of tolerance to the virus and the highest yielding cultivars were often the ones that exhibited the highest grain yield reductions. Even so, highest yielding cultivars under control conditions were usually the highest yielding under BYDV-inoculated conditions. Growth rate throughout the season was measured by fitting the Richards function to dry weight data collected on a weekly basis. The reduced biomass production under inoculated conditions resulted from reduced relative growth rates rather than from a shortened period of growth. Relative growth rate was not related to a cultivars tolerance based on grain yield reduction, but relative growth rate in the early part of the season was positively related to grain yield per se under BYDV infection.","Made available in DSpace on 2011-05-07T13:20:53Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9712308.pdf: 5127776 bytes, checksum: f4b32ce5a3bba4f90e2ceb0ae3f788a5 (MD5) Previous issue date: 1996","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:53:35Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:24:48-05:00 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":["(UMI)AAI9712308","http://hdl.handle.net/2142/21844","9780591198980","AAI9712308"],"dc:language":["eng"],"dc:rights":["Copyright 1996 Hoffman, Thomas Karl"],"dc:subject":["Agriculture, Agronomy","Agriculture, Plant Pathology"],"dc:title":["Variation for root and shoot growth among wheat cultivars and the effects of barley yellow dwarf virus on growth"],"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":"2026-07-22T22:25:18Z"}