{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/22945"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/22945","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Coordination of physiological and morphological acclimation of shade-grown tree saplings to late-season canopy gap formation","abstract":"The purpose of my research was to test the hypothesis that if shade-grown deciduous hardwood saplings respond positively to late-season canopy gaps, then morphological and physiological changes at both the organ and whole-plant level will result in greater carbon gain of saplings exposed to gaps relative to saplings remaining in the shade; that is, shade-developed saplings will acclimate to late-season canopy gaps. Late-season canopy gap formation was simulated by growing potted saplings in the forest understory and moving them to a naturally occurring canopy gap after leaf development was completed in the shade. A series of experiments with the same basic experimental design was conducted on up to four species of temperate deciduous hardwoods: red oak (Quercus rubra L.), sugar maple (Acer saccharum Marsh.), tulip poplar (Liriodendron tulipifera L.), and white ash (Fraxinus americana L.). Physiological acclimation responses included higher photosynthetic rates in shade-developed foliage upon exposure to higher irradiance and temperature conditions within the gap for each species. However, the magnitude of this change and associated physiological responses varied among species. In general, the increase in photosynthetic rate was correlated with increased stomatal conductance and leaf nitrogen content and, for red oak, decreased susceptibility to photoinhibition. Morphological acclimation responses also varied among species, and included greater allocation to new leaf production and root production after exposure to a gap. Species such as red oak, which acclimated to canopy gaps (increased carbon gain within the season of gap formation), demonstrated coordinated changes in both physiological and morphological mechanisms of acclimation. Conversely, sugar maple had a much more limited acclimation response, reflected in a greater susceptibility to photoinhibition and stomatal limitations to photosynthesis of shade-developed foliage, and limited production of new leaves within the gap. Interspecific comparisons suggest that acclimation involves a suite of coordinated processes rather than trade-offs between mutually exclusive mechanisms of acclimation.","abstract_html":"The purpose of my research was to test the hypothesis that if shade-grown deciduous hardwood saplings respond positively to late-season canopy gaps, then morphological and physiological changes at both the organ and whole-plant level will result in greater carbon gain of saplings exposed to gaps relative to saplings remaining in the shade; that is, shade-developed saplings will acclimate to late-season canopy gaps. Late-season canopy gap formation was simulated by growing potted saplings in the forest understory and moving them to a naturally occurring canopy gap after leaf development was completed in the shade. A series of experiments with the same basic experimental design was conducted on up to four species of temperate deciduous hardwoods: red oak (Quercus rubra L.), sugar maple (Acer saccharum Marsh.), tulip poplar (Liriodendron tulipifera L.), and white ash (Fraxinus americana L.). Physiological acclimation responses included higher photosynthetic rates in shade-developed foliage upon exposure to higher irradiance and temperature conditions within the gap for each species. However, the magnitude of this change and associated physiological responses varied among species. In general, the increase in photosynthetic rate was correlated with increased stomatal conductance and leaf nitrogen content and, for red oak, decreased susceptibility to photoinhibition. Morphological acclimation responses also varied among species, and included greater allocation to new leaf production and root production after exposure to a gap. Species such as red oak, which acclimated to canopy gaps (increased carbon gain within the season of gap formation), demonstrated coordinated changes in both physiological and morphological mechanisms of acclimation. Conversely, sugar maple had a much more limited acclimation response, reflected in a greater susceptibility to photoinhibition and stomatal limitations to photosynthesis of shade-developed foliage, and limited production of new leaves within the gap. Interspecific comparisons suggest that acclimation involves a suite of coordinated processes rather than trade-offs between mutually exclusive mechanisms of acclimation.","abstract_has_math":false,"creators":["Naidu, Shawna Lynn"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Plant Biology","degree_department":null,"school":null,"contributors":["DeLucia, Evan H."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2011,"date_issued":"2011-05-07T13:56:46Z","date_published":"2011-05-07T13:56:46Z","updated_at":"2026-07-22T22:25:21Z","subjects":["Biology, Botany","Biology, Ecology","Agriculture, Forestry and Wildlife","Biology, Plant Physiology"],"languages":["eng"],"rights":["Copyright 1996 Naidu, Shawna Lynn"],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["9780591089301","AAI9702620","(UMI)AAI9702620"],"render_values":[{"text":"9780591089301","href":null,"code":true},{"text":"AAI9702620","href":null,"code":true},{"text":"(UMI)AAI9702620","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/22945","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["DeLucia, Evan H."]},{"key":"dc:creator","label":"Author","values":["Naidu, Shawna Lynn"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2011-05-07T13:56:46Z","10000-01-01","1996"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Plant Biology","Biology, Plant Physiology"]},{"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","Agriculture, Forestry and Wildlife","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 Naidu, Shawna Lynn"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["9780591089301","AAI9702620","(UMI)AAI9702620","http://hdl.handle.net/2142/22945"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["The purpose of my research was to test the hypothesis that if shade-grown deciduous hardwood saplings respond positively to late-season canopy gaps, then morphological and physiological changes at both the organ and whole-plant level will result in greater carbon gain of saplings exposed to gaps relative to saplings remaining in the shade; that is, shade-developed saplings will acclimate to late-season canopy gaps. Late-season canopy gap formation was simulated by growing potted saplings in the forest understory and moving them to a naturally occurring canopy gap after leaf development was completed in the shade. A series of experiments with the same basic experimental design was conducted on up to four species of temperate deciduous hardwoods: red oak (Quercus rubra L.), sugar maple (Acer saccharum Marsh.), tulip poplar (Liriodendron tulipifera L.), and white ash (Fraxinus americana L.). Physiological acclimation responses included higher photosynthetic rates in shade-developed foliage upon exposure to higher irradiance and temperature conditions within the gap for each species. However, the magnitude of this change and associated physiological responses varied among species. In general, the increase in photosynthetic rate was correlated with increased stomatal conductance and leaf nitrogen content and, for red oak, decreased susceptibility to photoinhibition. Morphological acclimation responses also varied among species, and included greater allocation to new leaf production and root production after exposure to a gap. Species such as red oak, which acclimated to canopy gaps (increased carbon gain within the season of gap formation), demonstrated coordinated changes in both physiological and morphological mechanisms of acclimation. Conversely, sugar maple had a much more limited acclimation response, reflected in a greater susceptibility to photoinhibition and stomatal limitations to photosynthesis of shade-developed foliage, and limited production of new leaves within the gap. Interspecific comparisons suggest that acclimation involves a suite of coordinated processes rather than trade-offs between mutually exclusive mechanisms of acclimation.","Made available in DSpace on 2011-05-07T13:56:46Z (GMT). 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Late-season canopy gap formation was simulated by growing potted saplings in the forest understory and moving them to a naturally occurring canopy gap after leaf development was completed in the shade. A series of experiments with the same basic experimental design was conducted on up to four species of temperate deciduous hardwoods: red oak (Quercus rubra L.), sugar maple (Acer saccharum Marsh.), tulip poplar (Liriodendron tulipifera L.), and white ash (Fraxinus americana L.). Physiological acclimation responses included higher photosynthetic rates in shade-developed foliage upon exposure to higher irradiance and temperature conditions within the gap for each species. However, the magnitude of this change and associated physiological responses varied among species. In general, the increase in photosynthetic rate was correlated with increased stomatal conductance and leaf nitrogen content and, for red oak, decreased susceptibility to photoinhibition. Morphological acclimation responses also varied among species, and included greater allocation to new leaf production and root production after exposure to a gap. Species such as red oak, which acclimated to canopy gaps (increased carbon gain within the season of gap formation), demonstrated coordinated changes in both physiological and morphological mechanisms of acclimation. Conversely, sugar maple had a much more limited acclimation response, reflected in a greater susceptibility to photoinhibition and stomatal limitations to photosynthesis of shade-developed foliage, and limited production of new leaves within the gap. Interspecific comparisons suggest that acclimation involves a suite of coordinated processes rather than trade-offs between mutually exclusive mechanisms of acclimation.","Made available in DSpace on 2011-05-07T13:56:46Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9702620.pdf: 6202151 bytes, checksum: c100a99fb5595f0abd265374689cf392 (MD5) Previous issue date: 1996","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T15:01:06Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:28:58-05:00 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":["9780591089301","AAI9702620","(UMI)AAI9702620","http://hdl.handle.net/2142/22945"],"dc:language":["eng"],"dc:rights":["Copyright 1996 Naidu, Shawna Lynn"],"dc:subject":["Biology, Botany","Biology, Ecology","Agriculture, Forestry and Wildlife","Biology, Plant Physiology"],"dc:title":["Coordination of physiological and morphological acclimation of shade-grown tree saplings to late-season canopy gap formation"],"dc:type":["text"],"thesis:degree_discipline":["Plant Biology","Biology, Plant Physiology"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:25:21Z"}