Is the quantity of orbicules released by Dactylis glomerataand Cynosurus echinatus(Poaceae) big enough to play an allergenic role?
Autor(a) principal: | |
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Data de Publicação: | 2007 |
Outros Autores: | , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10316/8971 https://doi.org/10.1080/00173130701448066 |
Resumo: | Orbicule characteristics of Dactylis glomerataand Cynosurus echinatus(Poaceae) were investigated using light (LM), scanning electron (SEM) and transmission electron microscopy (TEM). Based on SEM micrographs, the number of orbicules per 100 µm2 of the locule wall surface was determined in both dehisced and undehisced anthers and was further compared statistically. A total of 100 pollen grains were examined using SEM in search for orbicules attached to the pollen exine. Orbicules were not found distributed freely in the anther locules. They were attached to the locule wall surface through sporopolleninous fibrils, the orbicule wall being firmly embedded in, and often in continuity with the thin layer of sporopollenin lining each locule. The orbicule density on the locule wall surface of both the dehisced and undehisced anthers did not differ significantly. Only a few orbicules were seen attached to the pollen exine in both species. It is concluded that orbicules are not easily removed from the surface of the locule wall and, consequently, that the number of orbicules emitted from the two grass species is too low to play a significant role in triggering allergic diseases. |
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Is the quantity of orbicules released by Dactylis glomerataand Cynosurus echinatus(Poaceae) big enough to play an allergenic role?Orbicule characteristics of Dactylis glomerataand Cynosurus echinatus(Poaceae) were investigated using light (LM), scanning electron (SEM) and transmission electron microscopy (TEM). Based on SEM micrographs, the number of orbicules per 100 µm2 of the locule wall surface was determined in both dehisced and undehisced anthers and was further compared statistically. A total of 100 pollen grains were examined using SEM in search for orbicules attached to the pollen exine. Orbicules were not found distributed freely in the anther locules. They were attached to the locule wall surface through sporopolleninous fibrils, the orbicule wall being firmly embedded in, and often in continuity with the thin layer of sporopollenin lining each locule. The orbicule density on the locule wall surface of both the dehisced and undehisced anthers did not differ significantly. Only a few orbicules were seen attached to the pollen exine in both species. It is concluded that orbicules are not easily removed from the surface of the locule wall and, consequently, that the number of orbicules emitted from the two grass species is too low to play a significant role in triggering allergic diseases.http://www.informaworld.com/10.1080/001731307014480662007info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://hdl.handle.net/10316/8971http://hdl.handle.net/10316/8971https://doi.org/10.1080/00173130701448066engGrana - Taylor & Francis. 46:3 (2007) 140-147Dinis, Augusto M.Baptista, FilipaCoutinho, A. Pereirainfo:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2021-10-11T08:06:42Zoai:estudogeral.uc.pt:10316/8971Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T20:55:52.060504Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Is the quantity of orbicules released by Dactylis glomerataand Cynosurus echinatus(Poaceae) big enough to play an allergenic role? |
title |
Is the quantity of orbicules released by Dactylis glomerataand Cynosurus echinatus(Poaceae) big enough to play an allergenic role? |
spellingShingle |
Is the quantity of orbicules released by Dactylis glomerataand Cynosurus echinatus(Poaceae) big enough to play an allergenic role? Dinis, Augusto M. |
title_short |
Is the quantity of orbicules released by Dactylis glomerataand Cynosurus echinatus(Poaceae) big enough to play an allergenic role? |
title_full |
Is the quantity of orbicules released by Dactylis glomerataand Cynosurus echinatus(Poaceae) big enough to play an allergenic role? |
title_fullStr |
Is the quantity of orbicules released by Dactylis glomerataand Cynosurus echinatus(Poaceae) big enough to play an allergenic role? |
title_full_unstemmed |
Is the quantity of orbicules released by Dactylis glomerataand Cynosurus echinatus(Poaceae) big enough to play an allergenic role? |
title_sort |
Is the quantity of orbicules released by Dactylis glomerataand Cynosurus echinatus(Poaceae) big enough to play an allergenic role? |
author |
Dinis, Augusto M. |
author_facet |
Dinis, Augusto M. Baptista, Filipa Coutinho, A. Pereira |
author_role |
author |
author2 |
Baptista, Filipa Coutinho, A. Pereira |
author2_role |
author author |
dc.contributor.author.fl_str_mv |
Dinis, Augusto M. Baptista, Filipa Coutinho, A. Pereira |
description |
Orbicule characteristics of Dactylis glomerataand Cynosurus echinatus(Poaceae) were investigated using light (LM), scanning electron (SEM) and transmission electron microscopy (TEM). Based on SEM micrographs, the number of orbicules per 100 µm2 of the locule wall surface was determined in both dehisced and undehisced anthers and was further compared statistically. A total of 100 pollen grains were examined using SEM in search for orbicules attached to the pollen exine. Orbicules were not found distributed freely in the anther locules. They were attached to the locule wall surface through sporopolleninous fibrils, the orbicule wall being firmly embedded in, and often in continuity with the thin layer of sporopollenin lining each locule. The orbicule density on the locule wall surface of both the dehisced and undehisced anthers did not differ significantly. Only a few orbicules were seen attached to the pollen exine in both species. It is concluded that orbicules are not easily removed from the surface of the locule wall and, consequently, that the number of orbicules emitted from the two grass species is too low to play a significant role in triggering allergic diseases. |
publishDate |
2007 |
dc.date.none.fl_str_mv |
2007 |
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 |
http://hdl.handle.net/10316/8971 http://hdl.handle.net/10316/8971 https://doi.org/10.1080/00173130701448066 |
url |
http://hdl.handle.net/10316/8971 https://doi.org/10.1080/00173130701448066 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Grana - Taylor & Francis. 46:3 (2007) 140-147 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
instacron_str |
RCAAP |
institution |
RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
collection |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository.name.fl_str_mv |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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1799133844843003904 |