Maximum carboxylation velocity of rubisco and maximum rate of electron transport in saplings in response to variations in environmental factors in central Amazonia
Autor(a) principal: | |
---|---|
Data de Publicação: | 2017 |
Outros Autores: | , |
Tipo de documento: | Artigo |
Idioma: | por |
Título da fonte: | Repositório Institucional do INPA |
Texto Completo: | https://repositorio.inpa.gov.br/handle/1/15373 |
Resumo: | Light availability is one of the main factors that limits photosynthetic rates in saplings in the forest understory. The aims of this study were to determine how photosynthetic parameters (maximum carboxylation velocity of Rubisco – Vc-max and maximum rate of electron transport – Jmax) respond to irradiance, temperature and diurnal variations in the physical environment. Gas exchange data were collected between 08h00 and 16h00, and from September to November (2010) under ambient conditions, temperature of 27± 2 ºC and relative humidity of 70 ± 3%. CO2 saturated photosynthesis (Apot) was measured under light saturation and [CO2] of 2000 μmol mol-1. Data were subjected to analysis of variance and then the Tukey test was used for mean separations. Vc-max and Jmax correlated with photosynthetic rates at [CO2] of 380 μmol mol-1 (A380) and Apot. The increase in intercellular CO2 concentration (Ci) led to increase in photosynthetic rates, up to the point of photosynthesis limitation by the electron transport rate. Below the collimation point (300-569 μmol mol-1) photosynthetic rates were limited by Vc-max. Increases in irradiance and temperature in the forest understory led to increasing the values of A380, Apot, Vc-max and Jmax. However, the effect of time of day on Vc-max and Jmax was not significant (p > 0.05). Absence of an effect of time of day on Vc-max and Jmax is important for the leaf to efficiently use the sun flecks that occasionally puncture the forest floor. © 2017, Universidade Federal de Santa Maria. All rights reserved. |
id |
INPA-2_c1123b6a418b0cfdec8a78cb5e485e76 |
---|---|
oai_identifier_str |
oai:repositorio:1/15373 |
network_acronym_str |
INPA-2 |
network_name_str |
Repositório Institucional do INPA |
repository_id_str |
|
spelling |
Mendes, Keila RêgoMarenco, R. A.Nascimento, Helena Cristina Santos2020-05-08T20:36:25Z2020-05-08T20:36:25Z2017https://repositorio.inpa.gov.br/handle/1/1537310.5902/1980509828666Light availability is one of the main factors that limits photosynthetic rates in saplings in the forest understory. The aims of this study were to determine how photosynthetic parameters (maximum carboxylation velocity of Rubisco – Vc-max and maximum rate of electron transport – Jmax) respond to irradiance, temperature and diurnal variations in the physical environment. Gas exchange data were collected between 08h00 and 16h00, and from September to November (2010) under ambient conditions, temperature of 27± 2 ºC and relative humidity of 70 ± 3%. CO2 saturated photosynthesis (Apot) was measured under light saturation and [CO2] of 2000 μmol mol-1. Data were subjected to analysis of variance and then the Tukey test was used for mean separations. Vc-max and Jmax correlated with photosynthetic rates at [CO2] of 380 μmol mol-1 (A380) and Apot. The increase in intercellular CO2 concentration (Ci) led to increase in photosynthetic rates, up to the point of photosynthesis limitation by the electron transport rate. Below the collimation point (300-569 μmol mol-1) photosynthetic rates were limited by Vc-max. Increases in irradiance and temperature in the forest understory led to increasing the values of A380, Apot, Vc-max and Jmax. However, the effect of time of day on Vc-max and Jmax was not significant (p > 0.05). Absence of an effect of time of day on Vc-max and Jmax is important for the leaf to efficiently use the sun flecks that occasionally puncture the forest floor. © 2017, Universidade Federal de Santa Maria. All rights reserved.Volume 27, Número 3, Pags. 947-959Attribution-NonCommercial-NoDerivs 3.0 Brazilhttp://creativecommons.org/licenses/by-nc-nd/3.0/br/info:eu-repo/semantics/openAccessMaximum carboxylation velocity of rubisco and maximum rate of electron transport in saplings in response to variations in environmental factors in central AmazoniaVelocidade de carboxilação da rubisco e transporte de elétrons em espécies arbóreas em resposta a fatores do ambiente na Amazônia centralinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleCiência Florestalporreponame:Repositório Institucional do INPAinstname:Instituto Nacional de Pesquisas da Amazônia (INPA)instacron:INPAORIGINALartigo-inpa.pdfartigo-inpa.pdfapplication/pdf1286773https://repositorio.inpa.gov.br/bitstream/1/15373/1/artigo-inpa.pdf9ea9372d7cb28565664c0d62fdce8a01MD511/153732020-07-14 11:05:18.59oai:repositorio:1/15373Repositório de PublicaçõesPUBhttps://repositorio.inpa.gov.br/oai/requestopendoar:2020-07-14T15:05:18Repositório Institucional do INPA - Instituto Nacional de Pesquisas da Amazônia (INPA)false |
dc.title.en.fl_str_mv |
Maximum carboxylation velocity of rubisco and maximum rate of electron transport in saplings in response to variations in environmental factors in central Amazonia |
dc.title.alternative.pt_BR.fl_str_mv |
Velocidade de carboxilação da rubisco e transporte de elétrons em espécies arbóreas em resposta a fatores do ambiente na Amazônia central |
title |
Maximum carboxylation velocity of rubisco and maximum rate of electron transport in saplings in response to variations in environmental factors in central Amazonia |
spellingShingle |
Maximum carboxylation velocity of rubisco and maximum rate of electron transport in saplings in response to variations in environmental factors in central Amazonia Mendes, Keila Rêgo |
title_short |
Maximum carboxylation velocity of rubisco and maximum rate of electron transport in saplings in response to variations in environmental factors in central Amazonia |
title_full |
Maximum carboxylation velocity of rubisco and maximum rate of electron transport in saplings in response to variations in environmental factors in central Amazonia |
title_fullStr |
Maximum carboxylation velocity of rubisco and maximum rate of electron transport in saplings in response to variations in environmental factors in central Amazonia |
title_full_unstemmed |
Maximum carboxylation velocity of rubisco and maximum rate of electron transport in saplings in response to variations in environmental factors in central Amazonia |
title_sort |
Maximum carboxylation velocity of rubisco and maximum rate of electron transport in saplings in response to variations in environmental factors in central Amazonia |
author |
Mendes, Keila Rêgo |
author_facet |
Mendes, Keila Rêgo Marenco, R. A. Nascimento, Helena Cristina Santos |
author_role |
author |
author2 |
Marenco, R. A. Nascimento, Helena Cristina Santos |
author2_role |
author author |
dc.contributor.author.fl_str_mv |
Mendes, Keila Rêgo Marenco, R. A. Nascimento, Helena Cristina Santos |
description |
Light availability is one of the main factors that limits photosynthetic rates in saplings in the forest understory. The aims of this study were to determine how photosynthetic parameters (maximum carboxylation velocity of Rubisco – Vc-max and maximum rate of electron transport – Jmax) respond to irradiance, temperature and diurnal variations in the physical environment. Gas exchange data were collected between 08h00 and 16h00, and from September to November (2010) under ambient conditions, temperature of 27± 2 ºC and relative humidity of 70 ± 3%. CO2 saturated photosynthesis (Apot) was measured under light saturation and [CO2] of 2000 μmol mol-1. Data were subjected to analysis of variance and then the Tukey test was used for mean separations. Vc-max and Jmax correlated with photosynthetic rates at [CO2] of 380 μmol mol-1 (A380) and Apot. The increase in intercellular CO2 concentration (Ci) led to increase in photosynthetic rates, up to the point of photosynthesis limitation by the electron transport rate. Below the collimation point (300-569 μmol mol-1) photosynthetic rates were limited by Vc-max. Increases in irradiance and temperature in the forest understory led to increasing the values of A380, Apot, Vc-max and Jmax. However, the effect of time of day on Vc-max and Jmax was not significant (p > 0.05). Absence of an effect of time of day on Vc-max and Jmax is important for the leaf to efficiently use the sun flecks that occasionally puncture the forest floor. © 2017, Universidade Federal de Santa Maria. All rights reserved. |
publishDate |
2017 |
dc.date.issued.fl_str_mv |
2017 |
dc.date.accessioned.fl_str_mv |
2020-05-08T20:36:25Z |
dc.date.available.fl_str_mv |
2020-05-08T20:36:25Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
https://repositorio.inpa.gov.br/handle/1/15373 |
dc.identifier.doi.none.fl_str_mv |
10.5902/1980509828666 |
url |
https://repositorio.inpa.gov.br/handle/1/15373 |
identifier_str_mv |
10.5902/1980509828666 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.relation.ispartof.pt_BR.fl_str_mv |
Volume 27, Número 3, Pags. 947-959 |
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 |
Ciência Florestal |
publisher.none.fl_str_mv |
Ciência Florestal |
dc.source.none.fl_str_mv |
reponame:Repositório Institucional do INPA instname:Instituto Nacional de Pesquisas da Amazônia (INPA) instacron:INPA |
instname_str |
Instituto Nacional de Pesquisas da Amazônia (INPA) |
instacron_str |
INPA |
institution |
INPA |
reponame_str |
Repositório Institucional do INPA |
collection |
Repositório Institucional do INPA |
bitstream.url.fl_str_mv |
https://repositorio.inpa.gov.br/bitstream/1/15373/1/artigo-inpa.pdf |
bitstream.checksum.fl_str_mv |
9ea9372d7cb28565664c0d62fdce8a01 |
bitstream.checksumAlgorithm.fl_str_mv |
MD5 |
repository.name.fl_str_mv |
Repositório Institucional do INPA - Instituto Nacional de Pesquisas da Amazônia (INPA) |
repository.mail.fl_str_mv |
|
_version_ |
1809928902984859648 |