{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/108560"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/108560","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Characterization of natural variation in steady- and non-steady-state photosynthesis and its underlying mechanisms to improve productivity in rice (Oryza sativa)","abstract":"Rice is a staple crop that is critical to food security, especially throughout Asia. Despite tremendous yield increases during the Green Revolution, yields have begun to stagnate in recent decades. Improving the photosynthetic performance of rice presents an opportunity to both increase yields and resource-use efficiencies. Historically, most of our understanding of photosynthesis has come through measurements made at a steady-state. However, these measurements fail to account for the constantly fluctuating light environment that is more commonly seen in agricultural field settings where steady-state conditions seldom occur. Steady-state and non-steady-state photosynthesis were characterized and compared with the aim of understanding underlying mechanisms, limitations, and potential for improvement of photosynthesis in the future. Significant variation was found for photosynthetic traits both in steady- and non-steady-state light conditions within cultivated rice (Oryza sativa) accessions and two wild rice species. In most cases, more natural variation was found in non-steady-state conditions, suggesting that variation may have been overlooked through the focus on steady-state measurements. Little significant correlation was found between the performance of photosynthetic parameters measured in steady- and non-steady-state conditions, suggesting that photosynthesis may be regulated by different factors and sometimes competing factors in different light environments. Rice plants were found to be predominately limited by biochemistry during photosynthetic induction, as opposed to stomatal limitation. Evidence was found that selection for yield in breeding may have inadvertently selected for the improvement of some photosynthetic traits. However, new opportunities were also identified, particularly with regard to non-steady-state traits. Finally, the potential to improve intrinsic water-use efficiency and some photosynthetic traits at elevated [CO2] by emerging high-throughput technologies was identified, providing an opportunity for more sustainable and productive future rice.","abstract_html":"Rice is a staple crop that is critical to food security, especially throughout Asia. Despite tremendous yield increases during the Green Revolution, yields have begun to stagnate in recent decades. Improving the photosynthetic performance of rice presents an opportunity to both increase yields and resource-use efficiencies. Historically, most of our understanding of photosynthesis has come through measurements made at a steady-state. However, these measurements fail to account for the constantly fluctuating light environment that is more commonly seen in agricultural field settings where steady-state conditions seldom occur. Steady-state and non-steady-state photosynthesis were characterized and compared with the aim of understanding underlying mechanisms, limitations, and potential for improvement of photosynthesis in the future. Significant variation was found for photosynthetic traits both in steady- and non-steady-state light conditions within cultivated rice (Oryza sativa) accessions and two wild rice species. In most cases, more natural variation was found in non-steady-state conditions, suggesting that variation may have been overlooked through the focus on steady-state measurements. Little significant correlation was found between the performance of photosynthetic parameters measured in steady- and non-steady-state conditions, suggesting that photosynthesis may be regulated by different factors and sometimes competing factors in different light environments. Rice plants were found to be predominately limited by biochemistry during photosynthetic induction, as opposed to stomatal limitation. Evidence was found that selection for yield in breeding may have inadvertently selected for the improvement of some photosynthetic traits. However, new opportunities were also identified, particularly with regard to non-steady-state traits. Finally, the potential to improve intrinsic water-use efficiency and some photosynthetic traits at elevated [CO2] by emerging high-throughput technologies was identified, providing an opportunity for more sustainable and productive future rice.","abstract_has_math":false,"creators":["Acevedo-Siaca, Liana G."],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Crop Sciences","degree_department":null,"school":null,"contributors":["Long, Stephen P","Ort, Donald R","Ainsworth, Elizabeth","Studer, Anthony"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2020,"date_issued":"2020-10-07T22:07:10Z","date_published":"2020-10-07T22:07:10Z","updated_at":"2026-07-22T22:24:48Z","subjects":["photosynthesis","rice","photosynthetic induction","Rubisco","Rubisco activase","water-use efficiency","food security","global change"],"languages":["en"],"rights":["Copyright 2020 Liana Acevedo-Siaca"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/108560","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Long, Stephen P","Ort, Donald R","Ainsworth, Elizabeth","Studer, Anthony"]},{"key":"dc:creator","label":"Author","values":["Acevedo-Siaca, Liana G."]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2020-10-07T22:07:10Z","2022-10-07T22:44:53Z","2020-06-04","2020-08"]},{"key":"dc:type","label":"Dc Type","values":["text","Thesis"]},{"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":["photosynthesis","rice","photosynthetic induction","Rubisco","Rubisco activase","water-use efficiency","food security","global change"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2020 Liana Acevedo-Siaca"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/108560"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Rice is a staple crop that is critical to food security, especially throughout Asia. Despite tremendous yield increases during the Green Revolution, yields have begun to stagnate in recent decades. Improving the photosynthetic performance of rice presents an opportunity to both increase yields and resource-use efficiencies. Historically, most of our understanding of photosynthesis has come through measurements made at a steady-state. However, these measurements fail to account for the constantly fluctuating light environment that is more commonly seen in agricultural field settings where steady-state conditions seldom occur. Steady-state and non-steady-state photosynthesis were characterized and compared with the aim of understanding underlying mechanisms, limitations, and potential for improvement of photosynthesis in the future. Significant variation was found for photosynthetic traits both in steady- and non-steady-state light conditions within cultivated rice (Oryza sativa) accessions and two wild rice species. In most cases, more natural variation was found in non-steady-state conditions, suggesting that variation may have been overlooked through the focus on steady-state measurements. Little significant correlation was found between the performance of photosynthetic parameters measured in steady- and non-steady-state conditions, suggesting that photosynthesis may be regulated by different factors and sometimes competing factors in different light environments. Rice plants were found to be predominately limited by biochemistry during photosynthetic induction, as opposed to stomatal limitation. Evidence was found that selection for yield in breeding may have inadvertently selected for the improvement of some photosynthetic traits. However, new opportunities were also identified, particularly with regard to non-steady-state traits. Finally, the potential to improve intrinsic water-use efficiency and some photosynthetic traits at elevated [CO2] by emerging high-throughput technologies was identified, providing an opportunity for more sustainable and productive future rice.","Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2022-08-01","The student, Liana Acevedo-Siaca, accepted the attached license on 2020-05-29 at 13:48.","The student, Liana Acevedo-Siaca, submitted this Dissertation for approval on 2020-05-29 at 14:03.","This Dissertation was approved for publication on 2020-06-04 at 11:40.","DSpace SAF Submission Ingestion Package generated from Vireo submission #15425 on 2020-10-02 at 15:30:41","Made available in DSpace on 2020-10-07T22:07:10Z (GMT). No. of bitstreams: 3 ACEVEDO-SIACA-DISSERTATION-2020.pdf: 8744197 bytes, checksum: 9c6959bd3081a7fdb8875306cb49182b (MD5) LICENSE.txt: 4216 bytes, checksum: 76fbc10491758bd1f9336facea80048c (MD5) PROQUEST_LICENSE.txt: 4562 bytes, checksum: 34d4aa1e5b4d0a87f46a78e7d0b78c8b (MD5) Previous issue date: 2020-06-04","Embargo set by: Seth Robbins for item 116186 Lift date: 2022-10-07T22:07:19Z Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD system","Embargo set by: Seth Robbins for item 116186 Lift date: 2022-10-07T22:44:53Z Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD system","Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD system","U of I Only"]},{"key":"dc:format","label":"Dc Format","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Characterization of natural variation in steady- and non-steady-state photosynthesis and its underlying mechanisms to improve productivity in rice (Oryza sativa)"]}]}],"canonical_facts":{"dc:contributor":["Long, Stephen P","Ort, Donald R","Ainsworth, Elizabeth","Studer, Anthony"],"dc:creator":["Acevedo-Siaca, Liana G."],"dc:date":["2020-10-07T22:07:10Z","2022-10-07T22:44:53Z","2020-06-04","2020-08"],"dc:description":["Rice is a staple crop that is critical to food security, especially throughout Asia. Despite tremendous yield increases during the Green Revolution, yields have begun to stagnate in recent decades. Improving the photosynthetic performance of rice presents an opportunity to both increase yields and resource-use efficiencies. Historically, most of our understanding of photosynthesis has come through measurements made at a steady-state. However, these measurements fail to account for the constantly fluctuating light environment that is more commonly seen in agricultural field settings where steady-state conditions seldom occur. Steady-state and non-steady-state photosynthesis were characterized and compared with the aim of understanding underlying mechanisms, limitations, and potential for improvement of photosynthesis in the future. Significant variation was found for photosynthetic traits both in steady- and non-steady-state light conditions within cultivated rice (Oryza sativa) accessions and two wild rice species. In most cases, more natural variation was found in non-steady-state conditions, suggesting that variation may have been overlooked through the focus on steady-state measurements. Little significant correlation was found between the performance of photosynthetic parameters measured in steady- and non-steady-state conditions, suggesting that photosynthesis may be regulated by different factors and sometimes competing factors in different light environments. Rice plants were found to be predominately limited by biochemistry during photosynthetic induction, as opposed to stomatal limitation. Evidence was found that selection for yield in breeding may have inadvertently selected for the improvement of some photosynthetic traits. However, new opportunities were also identified, particularly with regard to non-steady-state traits. Finally, the potential to improve intrinsic water-use efficiency and some photosynthetic traits at elevated [CO2] by emerging high-throughput technologies was identified, providing an opportunity for more sustainable and productive future rice.","Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2022-08-01","The student, Liana Acevedo-Siaca, accepted the attached license on 2020-05-29 at 13:48.","The student, Liana Acevedo-Siaca, submitted this Dissertation for approval on 2020-05-29 at 14:03.","This Dissertation was approved for publication on 2020-06-04 at 11:40.","DSpace SAF Submission Ingestion Package generated from Vireo submission #15425 on 2020-10-02 at 15:30:41","Made available in DSpace on 2020-10-07T22:07:10Z (GMT). No. of bitstreams: 3 ACEVEDO-SIACA-DISSERTATION-2020.pdf: 8744197 bytes, checksum: 9c6959bd3081a7fdb8875306cb49182b (MD5) LICENSE.txt: 4216 bytes, checksum: 76fbc10491758bd1f9336facea80048c (MD5) PROQUEST_LICENSE.txt: 4562 bytes, checksum: 34d4aa1e5b4d0a87f46a78e7d0b78c8b (MD5) Previous issue date: 2020-06-04","Embargo set by: Seth Robbins for item 116186 Lift date: 2022-10-07T22:07:19Z Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD system","Embargo set by: Seth Robbins for item 116186 Lift date: 2022-10-07T22:44:53Z Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD system","Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD system","U of I Only"],"dc:format":["application/pdf"],"dc:identifier":["http://hdl.handle.net/2142/108560"],"dc:language":["en"],"dc:rights":["Copyright 2020 Liana Acevedo-Siaca"],"dc:subject":["photosynthesis","rice","photosynthetic induction","Rubisco","Rubisco activase","water-use efficiency","food security","global change"],"dc:title":["Characterization of natural variation in steady- and non-steady-state photosynthesis and its underlying mechanisms to improve productivity in rice (Oryza sativa)"],"dc:type":["text","Thesis"],"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":"2026-07-22T22:24:48Z"}