Photosynthetic light response of the C4 grasses Brachiaria brizantha and B. humidicola under shade
Autor(a) principal: | |
---|---|
Data de Publicação: | 2002 |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Scientia Agrícola (Online) |
Texto Completo: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000100009 |
Resumo: | Forage grasses in tropical pastures can be subjected to considerable diurnal and seasonal reductions in available light. To evaluate the physiological behavior of the tropical forage grasses Brachiaria brizantha cv. Marandu and B. humidicola to low light, the photosynthetic light response and chlorophyll contents of these species were compared for plants grown outdoors, on natural soil, in pots, in full sunlight and those shaded to 30 % of full sunlight, over a 30-day period. Both species showed the ability to adjust their photosynthetic behavior in response to shade. Photosynthetic capacity and light compensation point were lower for shade plants of both species, while apparent quantum yield was unaffected by the light regime. Dark respiration and chlorophyll a:b ratio were significantly reduced by shading only in B. humidicola. B. humidicola could be relatively more adapted to succeed, at least temporarily, in light-limited environments. |
id |
USP-18_b908a13380c078347faa0bcd260ec548 |
---|---|
oai_identifier_str |
oai:scielo:S0103-90162002000100009 |
network_acronym_str |
USP-18 |
network_name_str |
Scientia Agrícola (Online) |
repository_id_str |
|
spelling |
Photosynthetic light response of the C4 grasses Brachiaria brizantha and B. humidicola under shadecarbon assimilationchlorophyll contentlight compensation pointpastureForage grasses in tropical pastures can be subjected to considerable diurnal and seasonal reductions in available light. To evaluate the physiological behavior of the tropical forage grasses Brachiaria brizantha cv. Marandu and B. humidicola to low light, the photosynthetic light response and chlorophyll contents of these species were compared for plants grown outdoors, on natural soil, in pots, in full sunlight and those shaded to 30 % of full sunlight, over a 30-day period. Both species showed the ability to adjust their photosynthetic behavior in response to shade. Photosynthetic capacity and light compensation point were lower for shade plants of both species, while apparent quantum yield was unaffected by the light regime. Dark respiration and chlorophyll a:b ratio were significantly reduced by shading only in B. humidicola. B. humidicola could be relatively more adapted to succeed, at least temporarily, in light-limited environments.Escola Superior de Agricultura "Luiz de Queiroz"2002-03-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000100009Scientia Agricola v.59 n.1 2002reponame:Scientia Agrícola (Online)instname:Universidade de São Paulo (USP)instacron:USP10.1590/S0103-90162002000100009info:eu-repo/semantics/openAccessDias-Filho,Moacyr Bernardinoeng2002-09-27T00:00:00Zoai:scielo:S0103-90162002000100009Revistahttp://revistas.usp.br/sa/indexPUBhttps://old.scielo.br/oai/scielo-oai.phpscientia@usp.br||alleoni@usp.br1678-992X0103-9016opendoar:2002-09-27T00:00Scientia Agrícola (Online) - Universidade de São Paulo (USP)false |
dc.title.none.fl_str_mv |
Photosynthetic light response of the C4 grasses Brachiaria brizantha and B. humidicola under shade |
title |
Photosynthetic light response of the C4 grasses Brachiaria brizantha and B. humidicola under shade |
spellingShingle |
Photosynthetic light response of the C4 grasses Brachiaria brizantha and B. humidicola under shade Dias-Filho,Moacyr Bernardino carbon assimilation chlorophyll content light compensation point pasture |
title_short |
Photosynthetic light response of the C4 grasses Brachiaria brizantha and B. humidicola under shade |
title_full |
Photosynthetic light response of the C4 grasses Brachiaria brizantha and B. humidicola under shade |
title_fullStr |
Photosynthetic light response of the C4 grasses Brachiaria brizantha and B. humidicola under shade |
title_full_unstemmed |
Photosynthetic light response of the C4 grasses Brachiaria brizantha and B. humidicola under shade |
title_sort |
Photosynthetic light response of the C4 grasses Brachiaria brizantha and B. humidicola under shade |
author |
Dias-Filho,Moacyr Bernardino |
author_facet |
Dias-Filho,Moacyr Bernardino |
author_role |
author |
dc.contributor.author.fl_str_mv |
Dias-Filho,Moacyr Bernardino |
dc.subject.por.fl_str_mv |
carbon assimilation chlorophyll content light compensation point pasture |
topic |
carbon assimilation chlorophyll content light compensation point pasture |
description |
Forage grasses in tropical pastures can be subjected to considerable diurnal and seasonal reductions in available light. To evaluate the physiological behavior of the tropical forage grasses Brachiaria brizantha cv. Marandu and B. humidicola to low light, the photosynthetic light response and chlorophyll contents of these species were compared for plants grown outdoors, on natural soil, in pots, in full sunlight and those shaded to 30 % of full sunlight, over a 30-day period. Both species showed the ability to adjust their photosynthetic behavior in response to shade. Photosynthetic capacity and light compensation point were lower for shade plants of both species, while apparent quantum yield was unaffected by the light regime. Dark respiration and chlorophyll a:b ratio were significantly reduced by shading only in B. humidicola. B. humidicola could be relatively more adapted to succeed, at least temporarily, in light-limited environments. |
publishDate |
2002 |
dc.date.none.fl_str_mv |
2002-03-01 |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000100009 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000100009 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
10.1590/S0103-90162002000100009 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
text/html |
dc.publisher.none.fl_str_mv |
Escola Superior de Agricultura "Luiz de Queiroz" |
publisher.none.fl_str_mv |
Escola Superior de Agricultura "Luiz de Queiroz" |
dc.source.none.fl_str_mv |
Scientia Agricola v.59 n.1 2002 reponame:Scientia Agrícola (Online) instname:Universidade de São Paulo (USP) instacron:USP |
instname_str |
Universidade de São Paulo (USP) |
instacron_str |
USP |
institution |
USP |
reponame_str |
Scientia Agrícola (Online) |
collection |
Scientia Agrícola (Online) |
repository.name.fl_str_mv |
Scientia Agrícola (Online) - Universidade de São Paulo (USP) |
repository.mail.fl_str_mv |
scientia@usp.br||alleoni@usp.br |
_version_ |
1748936458308157440 |