Growth, photosynthetic responses and acclimaton of tree species to different light environments

Detalhes bibliográficos
Autor(a) principal: Nina Junior, Adamir da Rocha
Data de Publicação: 2019
Tipo de documento: Tese
Idioma: eng
Título da fonte: Repositório Institucional do INPA
Texto Completo: https://repositorio.inpa.gov.br/handle/1/5001
http://lattes.cnpq.br/8816936810059985
Resumo: Light is a fundamental resource for energy flow in biological systems and is highly determinant for plant life. The great variability in the natural environment requires that plants, especially trees, exhibit a great ability to adjust metabolism to spatial and seasonal variations in the availability of this resource, aiming not only to maximize the capture and use of light, but also the development of efficient mechanisms in the dissipation of excess light energy to avoid photoinhibitory damages to photosynthetic apparatus. In this context, the objective of this study was to evaluate the photosynthetic plasticity and light acclimation capacity of six Amazonian tree species (Hymenea courbaril, Carapa guianensis, Hevea brasiliensis, Tabebuia serratifolia, Bellucia grossularioides and Ochroma pyramidale) divided into different successional groups (two late successionals, two mid-successional and two pioneers, respectively) in response to different light conditions (full sunlight [FS - 100 % of solar radiation, which simulates a clearing area], moderate shade [MS - provide by shade cloths reducing direct incident solar radiation] and deep shade [DS - provided by adult tree canopies, which simulate an understory light environment]).The photosynthetic circadian rhythm and NSC accumulation/turnover, relative growth and biomass accumulation rates, maximum photosynthesis and their limitations, leaf N partition, antioxidant system activity and transients of chlorophyll a fluorescence were evaluated in four individuals per species and per environment using multivariate analyzes. Regardless of the light regime, the limitations to daily photosynthetic course were preponderantly diffusive. The pioneer species and H. courbaril exhibited the highest photosynthetic rates and higher accumulation of biomass in FS. In DS, greater photosynthesis was observed for B. grossularioides, however, this did not reflect in a greater accumulation of biomass while in this environment. The morphological changes most correlated to acclimation were leaf area in DS and leaf gain in FS. The leaf nitrogen partition between photosynthetic and structural compounds was more determinant for photosynthesis than its own content, since the ability to modulate the N allocation is fundamental for increasing or decreasing photosynthesis as a consequence of changes in the light environment. There was higher N foliar investment in Rubisco by the pioneers in FS, which also showed higher photosynthetic rates, electron transport and carboxylation rate in this environment. Despite the smaller Vcmax in DS, the plants exhibited a higher activation state of Rubisco suggesting a better ability to take advantage of sunflecks, especially in late successional species. Regarding the antixodative system, the SOD activity was fundamental for the reduction of cell damage in FS, but this activity decreased n lower irradiances. Only the late successional C. guianensis exhibited photoinhibition in FS and the pioneer O. pyramidale did not survive on DS, suggesting that acclimation at high irradiance is less challenging than intense shading. The results suggest that growth while in a shaded environment is apparently determined more by factors related to starch accumulation and turnover than photosynthesis. Additionally, it can be concluded that the plasticity to regulate the leaf’s physiological and morphological adjustments and the capacity of acclimation in response to changes in light environment regime is not necessarily related to the successional group of species.
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spelling Nina Junior, Adamir da RochaMaia, Jair Max FurtunatoMartins, Samuel Cordeiro VitorGonçalves, José Francisco de Carvalho2020-01-10T15:36:54Z2020-01-10T15:36:54Z2019-02-28https://repositorio.inpa.gov.br/handle/1/5001http://lattes.cnpq.br/8816936810059985Light is a fundamental resource for energy flow in biological systems and is highly determinant for plant life. The great variability in the natural environment requires that plants, especially trees, exhibit a great ability to adjust metabolism to spatial and seasonal variations in the availability of this resource, aiming not only to maximize the capture and use of light, but also the development of efficient mechanisms in the dissipation of excess light energy to avoid photoinhibitory damages to photosynthetic apparatus. In this context, the objective of this study was to evaluate the photosynthetic plasticity and light acclimation capacity of six Amazonian tree species (Hymenea courbaril, Carapa guianensis, Hevea brasiliensis, Tabebuia serratifolia, Bellucia grossularioides and Ochroma pyramidale) divided into different successional groups (two late successionals, two mid-successional and two pioneers, respectively) in response to different light conditions (full sunlight [FS - 100 % of solar radiation, which simulates a clearing area], moderate shade [MS - provide by shade cloths reducing direct incident solar radiation] and deep shade [DS - provided by adult tree canopies, which simulate an understory light environment]).The photosynthetic circadian rhythm and NSC accumulation/turnover, relative growth and biomass accumulation rates, maximum photosynthesis and their limitations, leaf N partition, antioxidant system activity and transients of chlorophyll a fluorescence were evaluated in four individuals per species and per environment using multivariate analyzes. Regardless of the light regime, the limitations to daily photosynthetic course were preponderantly diffusive. The pioneer species and H. courbaril exhibited the highest photosynthetic rates and higher accumulation of biomass in FS. In DS, greater photosynthesis was observed for B. grossularioides, however, this did not reflect in a greater accumulation of biomass while in this environment. The morphological changes most correlated to acclimation were leaf area in DS and leaf gain in FS. The leaf nitrogen partition between photosynthetic and structural compounds was more determinant for photosynthesis than its own content, since the ability to modulate the N allocation is fundamental for increasing or decreasing photosynthesis as a consequence of changes in the light environment. There was higher N foliar investment in Rubisco by the pioneers in FS, which also showed higher photosynthetic rates, electron transport and carboxylation rate in this environment. Despite the smaller Vcmax in DS, the plants exhibited a higher activation state of Rubisco suggesting a better ability to take advantage of sunflecks, especially in late successional species. Regarding the antixodative system, the SOD activity was fundamental for the reduction of cell damage in FS, but this activity decreased n lower irradiances. Only the late successional C. guianensis exhibited photoinhibition in FS and the pioneer O. pyramidale did not survive on DS, suggesting that acclimation at high irradiance is less challenging than intense shading. The results suggest that growth while in a shaded environment is apparently determined more by factors related to starch accumulation and turnover than photosynthesis. Additionally, it can be concluded that the plasticity to regulate the leaf’s physiological and morphological adjustments and the capacity of acclimation in response to changes in light environment regime is not necessarily related to the successional group of species.A luz é um recurso primordial para o fluxo de energia nos sistemas biológicos sendo determinante para a vida das plantas. A grande variabilidade com que se apresenta em ambiente natural exige das plantas, em especial de árvores, que exibam grande capacidade de ajustar o metabolismo a variações espaciais e sazonais quanto a disponibilidade deste recurso visando não apenas a maximização na captura e utilização de luz, mas também o desenvolvimento de mecanismos eficiente na dissipação do excesso energia luminosa para evitar danos fotoinibitórios ao aparato fotossintético. Diante deste contexto, este estudo objetivou avaliar a plasticidade fotossintética e a capacidade de aclimatação de seis espécies arbóreas da Amazônia (Hymenea courbaril, Carapa guianensis, Hevea brasiliensis, Tabebuia serratifolia, Bellucia grossularioides e Ochroma pyramidale) pertencentes a grupos sucessionais distintos (duas sucessionais tardias, duas intermediárias e duas pioneiras , respectivamente) em reposta a diferentes condições de luminosidade (pleno sol[FS – 100% da radiação solar, simulando ambientes abertos]; sombreamento moderado[MS–35% de FS, providenciado pelo uso de sombrites] - e sombreamento intenso[DS – 5% de FS, sob a copa de árvores adultas, simulando ambiente de sub-bosque]). Foram avaliados o ritmo circadiano fotossintético e o acúmulo/turnover de CNE, as taxas de crescimento relativo e acúmulo de biomassa, a fotossíntese máxima e suas limitações, partição do N foliar, atividade do sistema antioxidante e as características da fluorescência da clorofila a. Independente do regime de luz as limitações ao curso diário fotossintético foram preponderantemente difusivas. As espécies pioneiras e H. courbaril exibiram as maiores taxas fotossintéticas e maior acúmulo de biomassa em FS. Em DS B. grossularioides exibiu maior fotossíntese, mas isso não refletiu em acúmulo de biomassa. As alterações morfológicas mais relacionadas a aclimatação foram a área foliar em DS e o ganho de folhas em FS. A partição do nitrogênio foliar entre compostos fotossintéticos e estruturais foi mais determinante para a fotossíntese do que seu próprio conteúdo, sendo a capacidade de modular a alocação do N fundamental para o aumento ou diminuição da fotossíntese em função de alterações no ambiente de luz. Houve maior investimento de N foliar em Rubisco pelas plantas pioneiras em FS, que exibiram também maiores taxas fotossintéticas, transporte de elétrons e velocidade de carboxilação neste ambiente. Apesar do menor Vcmax em DS, as plantas exibiram maior estado de ativação da Rubisco sugerindo melhor capacidade de aproveitamento de sunflecks, especialmente pelas sucessionais tardias. Quanto ao sistema antioxidativo, a atividade da SOD foi fundamental para redução de danos celulares em FS, tendo menor participação com a diminuição da irradiância. Apenas a sucessional tardia C. guianensis exibiu fotoinibição em FS e a pioneira O. pyramidale não sobreviveu em DS, sugerindo que a aclimatação a alta irradiância é menos desafiadora do que o sombreamento intenso. Os resultados demonstraram que crescimento a sombra aparentemente é mais determinado por fatores relacionados ao acúmulo e turnover de amido do que da fotossíntese. Adicionalmente, pode-se concluir que a plasticidade para regular os ajustes fisiológicos e morfológicos na folha e a capacidade de aclimatação em resposta às mudanças no regime de luz do ambiente não estão necessariamente relacionadas ao grupo sucessional da espécie.engInstituto Nacional de Pesquisas da Amazônia – INPACiências de Florestas Tropicais - CFTAttribution-NonCommercial-NoDerivs 3.0 Brazilhttp://creativecommons.org/licenses/by-nc-nd/3.0/br/info:eu-repo/semantics/openAccessEspécies de árvoreFotossínteseFotoinibiçãoGrowth, photosynthetic responses and acclimaton of tree species to different light environmentsinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/doctoralThesisreponame:Repositório Institucional do INPAinstname:Instituto Nacional de Pesquisas da Amazônia (INPA)instacron:INPAORIGINALAdamir_Nina Junior.pdfAdamir_Nina Junior.pdfapplication/pdf4201094https://repositorio.inpa.gov.br/bitstream/1/5001/1/Adamir_Nina%20Junior.pdf97b56d77db52f846935f46638aaa4b88MD511/50012020-01-10 14:11:38.774oai:repositorio:1/5001Repositório de PublicaçõesPUBhttps://repositorio.inpa.gov.br/oai/requestopendoar:2020-01-10T18:11:38Repositório Institucional do INPA - Instituto Nacional de Pesquisas da Amazônia (INPA)false
dc.title.pt_BR.fl_str_mv Growth, photosynthetic responses and acclimaton of tree species to different light environments
title Growth, photosynthetic responses and acclimaton of tree species to different light environments
spellingShingle Growth, photosynthetic responses and acclimaton of tree species to different light environments
Nina Junior, Adamir da Rocha
Espécies de árvore
Fotossíntese
Fotoinibição
title_short Growth, photosynthetic responses and acclimaton of tree species to different light environments
title_full Growth, photosynthetic responses and acclimaton of tree species to different light environments
title_fullStr Growth, photosynthetic responses and acclimaton of tree species to different light environments
title_full_unstemmed Growth, photosynthetic responses and acclimaton of tree species to different light environments
title_sort Growth, photosynthetic responses and acclimaton of tree species to different light environments
author Nina Junior, Adamir da Rocha
author_facet Nina Junior, Adamir da Rocha
author_role author
dc.contributor.co-advisor.none.fl_str_mv Maia, Jair Max Furtunato
Martins, Samuel Cordeiro Vitor
dc.contributor.author.fl_str_mv Nina Junior, Adamir da Rocha
dc.contributor.advisor1.fl_str_mv Gonçalves, José Francisco de Carvalho
contributor_str_mv Gonçalves, José Francisco de Carvalho
dc.subject.por.fl_str_mv Espécies de árvore
Fotossíntese
Fotoinibição
topic Espécies de árvore
Fotossíntese
Fotoinibição
description Light is a fundamental resource for energy flow in biological systems and is highly determinant for plant life. The great variability in the natural environment requires that plants, especially trees, exhibit a great ability to adjust metabolism to spatial and seasonal variations in the availability of this resource, aiming not only to maximize the capture and use of light, but also the development of efficient mechanisms in the dissipation of excess light energy to avoid photoinhibitory damages to photosynthetic apparatus. In this context, the objective of this study was to evaluate the photosynthetic plasticity and light acclimation capacity of six Amazonian tree species (Hymenea courbaril, Carapa guianensis, Hevea brasiliensis, Tabebuia serratifolia, Bellucia grossularioides and Ochroma pyramidale) divided into different successional groups (two late successionals, two mid-successional and two pioneers, respectively) in response to different light conditions (full sunlight [FS - 100 % of solar radiation, which simulates a clearing area], moderate shade [MS - provide by shade cloths reducing direct incident solar radiation] and deep shade [DS - provided by adult tree canopies, which simulate an understory light environment]).The photosynthetic circadian rhythm and NSC accumulation/turnover, relative growth and biomass accumulation rates, maximum photosynthesis and their limitations, leaf N partition, antioxidant system activity and transients of chlorophyll a fluorescence were evaluated in four individuals per species and per environment using multivariate analyzes. Regardless of the light regime, the limitations to daily photosynthetic course were preponderantly diffusive. The pioneer species and H. courbaril exhibited the highest photosynthetic rates and higher accumulation of biomass in FS. In DS, greater photosynthesis was observed for B. grossularioides, however, this did not reflect in a greater accumulation of biomass while in this environment. The morphological changes most correlated to acclimation were leaf area in DS and leaf gain in FS. The leaf nitrogen partition between photosynthetic and structural compounds was more determinant for photosynthesis than its own content, since the ability to modulate the N allocation is fundamental for increasing or decreasing photosynthesis as a consequence of changes in the light environment. There was higher N foliar investment in Rubisco by the pioneers in FS, which also showed higher photosynthetic rates, electron transport and carboxylation rate in this environment. Despite the smaller Vcmax in DS, the plants exhibited a higher activation state of Rubisco suggesting a better ability to take advantage of sunflecks, especially in late successional species. Regarding the antixodative system, the SOD activity was fundamental for the reduction of cell damage in FS, but this activity decreased n lower irradiances. Only the late successional C. guianensis exhibited photoinhibition in FS and the pioneer O. pyramidale did not survive on DS, suggesting that acclimation at high irradiance is less challenging than intense shading. The results suggest that growth while in a shaded environment is apparently determined more by factors related to starch accumulation and turnover than photosynthesis. Additionally, it can be concluded that the plasticity to regulate the leaf’s physiological and morphological adjustments and the capacity of acclimation in response to changes in light environment regime is not necessarily related to the successional group of species.
publishDate 2019
dc.date.issued.fl_str_mv 2019-02-28
dc.date.accessioned.fl_str_mv 2020-01-10T15:36:54Z
dc.date.available.fl_str_mv 2020-01-10T15:36:54Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/doctoralThesis
format doctoralThesis
status_str publishedVersion
dc.identifier.uri.fl_str_mv https://repositorio.inpa.gov.br/handle/1/5001
dc.identifier.author-lattes.pt_BR.fl_str_mv http://lattes.cnpq.br/8816936810059985
url https://repositorio.inpa.gov.br/handle/1/5001
http://lattes.cnpq.br/8816936810059985
dc.language.iso.fl_str_mv eng
language eng
dc.rights.driver.fl_str_mv Attribution-NonCommercial-NoDerivs 3.0 Brazil
http://creativecommons.org/licenses/by-nc-nd/3.0/br/
info:eu-repo/semantics/openAccess
rights_invalid_str_mv Attribution-NonCommercial-NoDerivs 3.0 Brazil
http://creativecommons.org/licenses/by-nc-nd/3.0/br/
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Instituto Nacional de Pesquisas da Amazônia – INPA
dc.publisher.program.fl_str_mv Ciências de Florestas Tropicais - CFT
publisher.none.fl_str_mv Instituto Nacional de Pesquisas da Amazônia – INPA
dc.source.none.fl_str_mv reponame:Repositório Institucional do INPA
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instacron_str INPA
institution INPA
reponame_str Repositório Institucional do INPA
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