Thylakoid-bound ascorbate peroxidase mutant exhibits impaired electron transport and photosynthetic activity
- Autores
- Danna, Cristian H.; Bartoli, Carlos Guillermo; Sacco, Francisco; Ingala, Lorena R.; Santa María, Guillermo E.; Guiamet, Juan José; Ugalde, Rodolfo A.
- Año de publicación
- 2003
- Idioma
- inglés
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- In chloroplasts, stromal and thylakoid-bound ascorbate peroxidases (tAPX) play a major role in the removal of H2O2 produced during photosynthesis. Here, we report that hexaploid wheat (Triticum aestivum) expresses three homeologous tAPX genes (TaAPX-6A, TaAPX-6B, and TaAPX-6D) mapping on group-6 chromosomes. The tAPX activity of a mutant line lacking TaAPX-6B was 40% lower than that of the wild type. When grown at high-light intensity photosystem II electron transfer, photosynthetic activity and biomass accumulation were significantly reduced in this mutant, suggesting that tAPX activity is essential for photosynthesis. Despite the reduced tAPX activity, mutant plants did not exhibit oxidative damage probably due to the reduced photochemical activity. This might be the result of a compensating mechanism to prevent oxidative damage having as a consequence a decrease in growth of the tAPX mutant plants.
Instituto de Fisiología Vegetal
Facultad de Ciencias Agrarias y Forestales - Materia
-
Ciencias Agrarias
Ciencias Exactas
ascorbate
H2O2 - Nivel de accesibilidad
- acceso abierto
- Condiciones de uso
- http://creativecommons.org/licenses/by-nc-sa/4.0/
- Repositorio
- Institución
- Universidad Nacional de La Plata
- OAI Identificador
- oai:sedici.unlp.edu.ar:10915/84571
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Thylakoid-bound ascorbate peroxidase mutant exhibits impaired electron transport and photosynthetic activityDanna, Cristian H.Bartoli, Carlos GuillermoSacco, FranciscoIngala, Lorena R.Santa María, Guillermo E.Guiamet, Juan JoséUgalde, Rodolfo A.Ciencias AgrariasCiencias ExactasascorbateH2O2In chloroplasts, stromal and thylakoid-bound ascorbate peroxidases (tAPX) play a major role in the removal of H<SUB>2</SUB>O<SUB>2</SUB> produced during photosynthesis. Here, we report that hexaploid wheat (<i>Triticum aestivum</i>) expresses three homeologous tAPX genes (TaAPX-6A, TaAPX-6B, and TaAPX-6D) mapping on group-6 chromosomes. The tAPX activity of a mutant line lacking TaAPX-6B was 40% lower than that of the wild type. When grown at high-light intensity photosystem II electron transfer, photosynthetic activity and biomass accumulation were significantly reduced in this mutant, suggesting that tAPX activity is essential for photosynthesis. Despite the reduced tAPX activity, mutant plants did not exhibit oxidative damage probably due to the reduced photochemical activity. This might be the result of a compensating mechanism to prevent oxidative damage having as a consequence a decrease in growth of the tAPX mutant plants.Instituto de Fisiología VegetalFacultad de Ciencias Agrarias y Forestales2003info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdf2116-2125http://sedici.unlp.edu.ar/handle/10915/84571enginfo:eu-repo/semantics/altIdentifier/issn/0032-0889info:eu-repo/semantics/altIdentifier/doi/10.1104/pp.103.021717info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc-sa/4.0/Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2025-09-29T11:16:15Zoai:sedici.unlp.edu.ar:10915/84571Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-29 11:16:16.096SEDICI (UNLP) - Universidad Nacional de La Platafalse |
dc.title.none.fl_str_mv |
Thylakoid-bound ascorbate peroxidase mutant exhibits impaired electron transport and photosynthetic activity |
title |
Thylakoid-bound ascorbate peroxidase mutant exhibits impaired electron transport and photosynthetic activity |
spellingShingle |
Thylakoid-bound ascorbate peroxidase mutant exhibits impaired electron transport and photosynthetic activity Danna, Cristian H. Ciencias Agrarias Ciencias Exactas ascorbate H2O2 |
title_short |
Thylakoid-bound ascorbate peroxidase mutant exhibits impaired electron transport and photosynthetic activity |
title_full |
Thylakoid-bound ascorbate peroxidase mutant exhibits impaired electron transport and photosynthetic activity |
title_fullStr |
Thylakoid-bound ascorbate peroxidase mutant exhibits impaired electron transport and photosynthetic activity |
title_full_unstemmed |
Thylakoid-bound ascorbate peroxidase mutant exhibits impaired electron transport and photosynthetic activity |
title_sort |
Thylakoid-bound ascorbate peroxidase mutant exhibits impaired electron transport and photosynthetic activity |
dc.creator.none.fl_str_mv |
Danna, Cristian H. Bartoli, Carlos Guillermo Sacco, Francisco Ingala, Lorena R. Santa María, Guillermo E. Guiamet, Juan José Ugalde, Rodolfo A. |
author |
Danna, Cristian H. |
author_facet |
Danna, Cristian H. Bartoli, Carlos Guillermo Sacco, Francisco Ingala, Lorena R. Santa María, Guillermo E. Guiamet, Juan José Ugalde, Rodolfo A. |
author_role |
author |
author2 |
Bartoli, Carlos Guillermo Sacco, Francisco Ingala, Lorena R. Santa María, Guillermo E. Guiamet, Juan José Ugalde, Rodolfo A. |
author2_role |
author author author author author author |
dc.subject.none.fl_str_mv |
Ciencias Agrarias Ciencias Exactas ascorbate H2O2 |
topic |
Ciencias Agrarias Ciencias Exactas ascorbate H2O2 |
dc.description.none.fl_txt_mv |
In chloroplasts, stromal and thylakoid-bound ascorbate peroxidases (tAPX) play a major role in the removal of H<SUB>2</SUB>O<SUB>2</SUB> produced during photosynthesis. Here, we report that hexaploid wheat (<i>Triticum aestivum</i>) expresses three homeologous tAPX genes (TaAPX-6A, TaAPX-6B, and TaAPX-6D) mapping on group-6 chromosomes. The tAPX activity of a mutant line lacking TaAPX-6B was 40% lower than that of the wild type. When grown at high-light intensity photosystem II electron transfer, photosynthetic activity and biomass accumulation were significantly reduced in this mutant, suggesting that tAPX activity is essential for photosynthesis. Despite the reduced tAPX activity, mutant plants did not exhibit oxidative damage probably due to the reduced photochemical activity. This might be the result of a compensating mechanism to prevent oxidative damage having as a consequence a decrease in growth of the tAPX mutant plants. Instituto de Fisiología Vegetal Facultad de Ciencias Agrarias y Forestales |
description |
In chloroplasts, stromal and thylakoid-bound ascorbate peroxidases (tAPX) play a major role in the removal of H<SUB>2</SUB>O<SUB>2</SUB> produced during photosynthesis. Here, we report that hexaploid wheat (<i>Triticum aestivum</i>) expresses three homeologous tAPX genes (TaAPX-6A, TaAPX-6B, and TaAPX-6D) mapping on group-6 chromosomes. The tAPX activity of a mutant line lacking TaAPX-6B was 40% lower than that of the wild type. When grown at high-light intensity photosystem II electron transfer, photosynthetic activity and biomass accumulation were significantly reduced in this mutant, suggesting that tAPX activity is essential for photosynthesis. Despite the reduced tAPX activity, mutant plants did not exhibit oxidative damage probably due to the reduced photochemical activity. This might be the result of a compensating mechanism to prevent oxidative damage having as a consequence a decrease in growth of the tAPX mutant plants. |
publishDate |
2003 |
dc.date.none.fl_str_mv |
2003 |
dc.type.none.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Articulo http://purl.org/coar/resource_type/c_6501 info:ar-repo/semantics/articulo |
format |
article |
status_str |
publishedVersion |
dc.identifier.none.fl_str_mv |
http://sedici.unlp.edu.ar/handle/10915/84571 |
url |
http://sedici.unlp.edu.ar/handle/10915/84571 |
dc.language.none.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
info:eu-repo/semantics/altIdentifier/issn/0032-0889 info:eu-repo/semantics/altIdentifier/doi/10.1104/pp.103.021717 |
dc.rights.none.fl_str_mv |
info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by-nc-sa/4.0/ Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) |
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openAccess |
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http://creativecommons.org/licenses/by-nc-sa/4.0/ Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) |
dc.format.none.fl_str_mv |
application/pdf 2116-2125 |
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