Effects of light on the growth and photosynthesis of Egeria najas planchon

Detalhes bibliográficos
Autor(a) principal: Tavechio,Washington Luiz Gomes
Data de Publicação: 2003
Outros Autores: Thomaz,Sidinei Magela
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Brazilian Archives of Biology and Technology
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132003000200011
Resumo: Photosynthesis and growth of Egeria najas (Hydrocharitaceae) from a subtropical reservoir (Itaipu Reservoir, Brazil-Paraguay) were measured in response to low light intensities (0-124 µM m-2 s-1 PAR) in the laboratory. Photosynthesis approached saturation in the range of light intensities used and light compensation point was reached at ca. 6-22 µM m-2 s-1 PAR, indicating that this species had a low light requirement for growth. Light stimulated shoot and root relative growth rates (RGR) but it was not related to ratios between root:shoot RGR. Laboratory observations indicated that (i) both shoot and root growth were simultaneously stimulated by light and (ii) the low light requirements of E. najas may explain its incidence in the Itaipu Reservoir, where biogenic as well as abiogenic turbidity is high.
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spelling Effects of light on the growth and photosynthesis of Egeria najas planchonEgeria najasphotosynthesisgrowthlight compensation pointrooted macrophytesPhotosynthesis and growth of Egeria najas (Hydrocharitaceae) from a subtropical reservoir (Itaipu Reservoir, Brazil-Paraguay) were measured in response to low light intensities (0-124 µM m-2 s-1 PAR) in the laboratory. Photosynthesis approached saturation in the range of light intensities used and light compensation point was reached at ca. 6-22 µM m-2 s-1 PAR, indicating that this species had a low light requirement for growth. Light stimulated shoot and root relative growth rates (RGR) but it was not related to ratios between root:shoot RGR. Laboratory observations indicated that (i) both shoot and root growth were simultaneously stimulated by light and (ii) the low light requirements of E. najas may explain its incidence in the Itaipu Reservoir, where biogenic as well as abiogenic turbidity is high.Instituto de Tecnologia do Paraná - Tecpar2003-03-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132003000200011Brazilian Archives of Biology and Technology v.46 n.2 2003reponame:Brazilian Archives of Biology and Technologyinstname:Instituto de Tecnologia do Paraná (Tecpar)instacron:TECPAR10.1590/S1516-89132003000200011info:eu-repo/semantics/openAccessTavechio,Washington Luiz GomesThomaz,Sidinei Magelaeng2003-07-29T00:00:00Zoai:scielo:S1516-89132003000200011Revistahttps://www.scielo.br/j/babt/https://old.scielo.br/oai/scielo-oai.phpbabt@tecpar.br||babt@tecpar.br1678-43241516-8913opendoar:2003-07-29T00:00Brazilian Archives of Biology and Technology - Instituto de Tecnologia do Paraná (Tecpar)false
dc.title.none.fl_str_mv Effects of light on the growth and photosynthesis of Egeria najas planchon
title Effects of light on the growth and photosynthesis of Egeria najas planchon
spellingShingle Effects of light on the growth and photosynthesis of Egeria najas planchon
Tavechio,Washington Luiz Gomes
Egeria najas
photosynthesis
growth
light compensation point
rooted macrophytes
title_short Effects of light on the growth and photosynthesis of Egeria najas planchon
title_full Effects of light on the growth and photosynthesis of Egeria najas planchon
title_fullStr Effects of light on the growth and photosynthesis of Egeria najas planchon
title_full_unstemmed Effects of light on the growth and photosynthesis of Egeria najas planchon
title_sort Effects of light on the growth and photosynthesis of Egeria najas planchon
author Tavechio,Washington Luiz Gomes
author_facet Tavechio,Washington Luiz Gomes
Thomaz,Sidinei Magela
author_role author
author2 Thomaz,Sidinei Magela
author2_role author
dc.contributor.author.fl_str_mv Tavechio,Washington Luiz Gomes
Thomaz,Sidinei Magela
dc.subject.por.fl_str_mv Egeria najas
photosynthesis
growth
light compensation point
rooted macrophytes
topic Egeria najas
photosynthesis
growth
light compensation point
rooted macrophytes
description Photosynthesis and growth of Egeria najas (Hydrocharitaceae) from a subtropical reservoir (Itaipu Reservoir, Brazil-Paraguay) were measured in response to low light intensities (0-124 µM m-2 s-1 PAR) in the laboratory. Photosynthesis approached saturation in the range of light intensities used and light compensation point was reached at ca. 6-22 µM m-2 s-1 PAR, indicating that this species had a low light requirement for growth. Light stimulated shoot and root relative growth rates (RGR) but it was not related to ratios between root:shoot RGR. Laboratory observations indicated that (i) both shoot and root growth were simultaneously stimulated by light and (ii) the low light requirements of E. najas may explain its incidence in the Itaipu Reservoir, where biogenic as well as abiogenic turbidity is high.
publishDate 2003
dc.date.none.fl_str_mv 2003-03-01
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=S1516-89132003000200011
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132003000200011
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.1590/S1516-89132003000200011
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 Instituto de Tecnologia do Paraná - Tecpar
publisher.none.fl_str_mv Instituto de Tecnologia do Paraná - Tecpar
dc.source.none.fl_str_mv Brazilian Archives of Biology and Technology v.46 n.2 2003
reponame:Brazilian Archives of Biology and Technology
instname:Instituto de Tecnologia do Paraná (Tecpar)
instacron:TECPAR
instname_str Instituto de Tecnologia do Paraná (Tecpar)
instacron_str TECPAR
institution TECPAR
reponame_str Brazilian Archives of Biology and Technology
collection Brazilian Archives of Biology and Technology
repository.name.fl_str_mv Brazilian Archives of Biology and Technology - Instituto de Tecnologia do Paraná (Tecpar)
repository.mail.fl_str_mv babt@tecpar.br||babt@tecpar.br
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