Artigo

Energetic flux and performance index in copaiba (Copaifera multijuga Hayne) and mahogany (Swietenia macrophylla King) seedlings grown under two irradiance environments

Plant adaptation under conditions of limited irradiance can be investigated by their efficiency while using the available energy with a minimal thermodynamic energy loss. For this reason, we compared the energetic fluxes and the performance index (PIABS) in copaiba (Copaifera multijuga) and mahogany...

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Autor principal: Gonçalves, José Francisco Carvalho de
Outros Autores: Santos, Ulysses M., Nina, Adamir da Rocha, Chevreuil, Larissa Ramos
Grau: Artigo
Idioma: English
Publicado em: Brazilian Journal of Plant Physiology 2020
Assuntos:
Copaifera Langsdorffii
Copaifera Multijuga
Swietenia
Swietenia Macrophylla
Acesso em linha: https://repositorio.inpa.gov.br/handle/1/16349
id oai:repositorio:1-16349
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spelling oai:repositorio:1-16349 Energetic flux and performance index in copaiba (Copaifera multijuga Hayne) and mahogany (Swietenia macrophylla King) seedlings grown under two irradiance environments Gonçalves, José Francisco Carvalho de Santos, Ulysses M. Nina, Adamir da Rocha Chevreuil, Larissa Ramos Copaifera Langsdorffii Copaifera Multijuga Swietenia Swietenia Macrophylla Plant adaptation under conditions of limited irradiance can be investigated by their efficiency while using the available energy with a minimal thermodynamic energy loss. For this reason, we compared the energetic fluxes and the performance index (PIABS) in copaiba (Copaifera multijuga) and mahogany (Swietenia macrophyla) seedlings under both sunlight and shade. The experiment was carried out in Manaus (3°8′S, 59°52′W), Amazonas State, Brazil. The fluorescence transients were obtained in intact and healthy leaves using a Plant Efficiency Analyser (PEA) between 1200 h and 1300 h. Using the O-J-I-P test, the following parameters were calculated: 1) density of reaction centers per cross section (RC/CS), 2) maximum quantum yield for primary photochemistry of photosystem II (φPo), and 3) probability of energy excitation (ψo) or that of an absorbed photon (φEo) to move an electron further than quinone A, and 4) the performance index (PIABS). The highest PIABS was found in seedlings under shade for both species. Mahogany seedlings exhibited values of PIABS about three-fold and 14-fold higher than copaiba seedlings under shade and sunlight, respectively. For RC/CS, reaction centers were inactive under sunlight, 58% for mahogany and 78% for copaiba. The high irradiance induced a decrease of φPo in mahogany (36%) and in copaiba (69%) when compared to shaded seedlings. This likely was a result of need for excess energy dissipation under sunlight. In addition, it was verified that seedlings under sunlight presented a severe decrease in φEo, particularly in copaiba (23-fold), when compared to mahogany (9-fold). Therefore, mahogany seedlings showed the highest performance in energy use under low and high irradiance, thus it may be proposed that mahogany presented lower entropy than copaiba seedlings, as demonstrated by the higher plasticity in the use of energy. 2020-06-03T21:27:32Z 2020-06-03T21:27:32Z 2007 Artigo https://repositorio.inpa.gov.br/handle/1/16349 10.1590/S1677-04202007000300001 en Volume 19, Número 3, Pags. 171-184 Attribution-NonCommercial-NoDerivs 3.0 Brazil http://creativecommons.org/licenses/by-nc-nd/3.0/br/ application/pdf Brazilian Journal of Plant Physiology
institution Instituto Nacional de Pesquisas da Amazônia - Repositório Institucional
collection INPA-RI
language English
topic Copaifera Langsdorffii
Copaifera Multijuga
Swietenia
Swietenia Macrophylla
spellingShingle Copaifera Langsdorffii
Copaifera Multijuga
Swietenia
Swietenia Macrophylla
Gonçalves, José Francisco Carvalho de
Energetic flux and performance index in copaiba (Copaifera multijuga Hayne) and mahogany (Swietenia macrophylla King) seedlings grown under two irradiance environments
topic_facet Copaifera Langsdorffii
Copaifera Multijuga
Swietenia
Swietenia Macrophylla
description Plant adaptation under conditions of limited irradiance can be investigated by their efficiency while using the available energy with a minimal thermodynamic energy loss. For this reason, we compared the energetic fluxes and the performance index (PIABS) in copaiba (Copaifera multijuga) and mahogany (Swietenia macrophyla) seedlings under both sunlight and shade. The experiment was carried out in Manaus (3°8′S, 59°52′W), Amazonas State, Brazil. The fluorescence transients were obtained in intact and healthy leaves using a Plant Efficiency Analyser (PEA) between 1200 h and 1300 h. Using the O-J-I-P test, the following parameters were calculated: 1) density of reaction centers per cross section (RC/CS), 2) maximum quantum yield for primary photochemistry of photosystem II (φPo), and 3) probability of energy excitation (ψo) or that of an absorbed photon (φEo) to move an electron further than quinone A, and 4) the performance index (PIABS). The highest PIABS was found in seedlings under shade for both species. Mahogany seedlings exhibited values of PIABS about three-fold and 14-fold higher than copaiba seedlings under shade and sunlight, respectively. For RC/CS, reaction centers were inactive under sunlight, 58% for mahogany and 78% for copaiba. The high irradiance induced a decrease of φPo in mahogany (36%) and in copaiba (69%) when compared to shaded seedlings. This likely was a result of need for excess energy dissipation under sunlight. In addition, it was verified that seedlings under sunlight presented a severe decrease in φEo, particularly in copaiba (23-fold), when compared to mahogany (9-fold). Therefore, mahogany seedlings showed the highest performance in energy use under low and high irradiance, thus it may be proposed that mahogany presented lower entropy than copaiba seedlings, as demonstrated by the higher plasticity in the use of energy.
format Artigo
author Gonçalves, José Francisco Carvalho de
author2 Santos, Ulysses M.
Nina, Adamir da Rocha
Chevreuil, Larissa Ramos
author2Str Santos, Ulysses M.
Nina, Adamir da Rocha
Chevreuil, Larissa Ramos
title Energetic flux and performance index in copaiba (Copaifera multijuga Hayne) and mahogany (Swietenia macrophylla King) seedlings grown under two irradiance environments
title_short Energetic flux and performance index in copaiba (Copaifera multijuga Hayne) and mahogany (Swietenia macrophylla King) seedlings grown under two irradiance environments
title_full Energetic flux and performance index in copaiba (Copaifera multijuga Hayne) and mahogany (Swietenia macrophylla King) seedlings grown under two irradiance environments
title_fullStr Energetic flux and performance index in copaiba (Copaifera multijuga Hayne) and mahogany (Swietenia macrophylla King) seedlings grown under two irradiance environments
title_full_unstemmed Energetic flux and performance index in copaiba (Copaifera multijuga Hayne) and mahogany (Swietenia macrophylla King) seedlings grown under two irradiance environments
title_sort energetic flux and performance index in copaiba (copaifera multijuga hayne) and mahogany (swietenia macrophylla king) seedlings grown under two irradiance environments
publisher Brazilian Journal of Plant Physiology
publishDate 2020
url https://repositorio.inpa.gov.br/handle/1/16349
_version_ 1787142942712922112
score 11.674684

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