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Registro Completo |
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Biblioteca(s): |
Embrapa Mandioca e Fruticultura. |
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Data corrente: |
19/03/2004 |
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Data da última atualização: |
19/03/2004 |
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Autoria: |
HABERMANN, G.; MACHADO, E. C.; RODRIGUES, J. D.; MEDINA, C. L. |
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Afiliação: |
Universidade Estadual Paulista. |
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Título: |
CO2 assimilation, photosynthetic ligt response curves, and water relations of 'Pêra' sweet orange plants infected with Xylella fastidiosa. |
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Ano de publicação: |
2003 |
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Fonte/Imprenta: |
Brazilian Journal of Plant Physiology, Londrina, v. 15, n. 2, p. 79-87, 2003. |
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ISSN: |
1677-0420 |
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Idioma: |
Inglês |
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Conteúdo: |
Plants with citrus variegated chlorosis (CVC), a disease caused by the xylem-limited bactéria Xylella fastidiosa, have leaves with water deficiency symptoms and are associated with decreases on the net photosynthesis and transpiration rates. Using healthy and CVC-affected 'Pêra' sweet orange plants on 'Rangpur' lime rootstock, the leaf gas exchange variables were measured with an open-gas portable photosynthesis system. All plants were watered and the leaf water potencial (Yw) was measured by isopiestic thermocouple psychrometric technique. The net photosynthesis (A) vs. internal leaf CO2 concentration (A/Ci curves) was analyzed. The relative effect of stomatal resistance on photosynthesis (S%) and the estimation of carboxylation efficiency were calculated. The rates of photosynthesis and transpiration, stomatal conductance, and internal leaf CO2 concentration (Ci) were also measured while varying the photosynthetic photon flux density (PPFD). The S% values were approximately 30% greater in infected plants when compared to healthy ones. The light compensation point for diseased plants was higher than in the healthy ones, and the saturation light point in plants with CVC was twofold lower. The lower Yw in diseased plants favours the hypothesis of xylem occlusion, which probably caused a lower water supply to the mesophyll, thus decreasing the photosynthesis and transpiration rates. Nevertheless, there was also a reduction in the photosynthetic metabolic activities, represented by lower carboxylation efficiency and photochemical disturbances that were detected in diseased plants. MenosPlants with citrus variegated chlorosis (CVC), a disease caused by the xylem-limited bactéria Xylella fastidiosa, have leaves with water deficiency symptoms and are associated with decreases on the net photosynthesis and transpiration rates. Using healthy and CVC-affected 'Pêra' sweet orange plants on 'Rangpur' lime rootstock, the leaf gas exchange variables were measured with an open-gas portable photosynthesis system. All plants were watered and the leaf water potencial (Yw) was measured by isopiestic thermocouple psychrometric technique. The net photosynthesis (A) vs. internal leaf CO2 concentration (A/Ci curves) was analyzed. The relative effect of stomatal resistance on photosynthesis (S%) and the estimation of carboxylation efficiency were calculated. The rates of photosynthesis and transpiration, stomatal conductance, and internal leaf CO2 concentration (Ci) were also measured while varying the photosynthetic photon flux density (PPFD). The S% values were approximately 30% greater in infected plants when compared to healthy ones. The light compensation point for diseased plants was higher than in the healthy ones, and the saturation light point in plants with CVC was twofold lower. The lower Yw in diseased plants favours the hypothesis of xylem occlusion, which probably caused a lower water supply to the mesophyll, thus decreasing the photosynthesis and transpiration rates. Nevertheless, there was also a reduction in the photosynthetic metabolic activities, represe... Mostrar Tudo |
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Palavras-Chave: |
A/Ci curves; Citrus sinensis L; Osbeck; photosynthetic metabolism; photosynthetic photon flux density. |
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Thesaurus Nal: |
citrus variegated chlorosis; stomata. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02415naa a2200253 a 4500
001 1651711
005 2004-03-19
008 2003 bl uuuu u00u1 u #d
022 $a1677-0420
100 1 $aHABERMANN, G.
245 $aCO2 assimilation, photosynthetic ligt response curves, and water relations of 'Pêra' sweet orange plants infected with Xylella fastidiosa.
260 $c2003
520 $aPlants with citrus variegated chlorosis (CVC), a disease caused by the xylem-limited bactéria Xylella fastidiosa, have leaves with water deficiency symptoms and are associated with decreases on the net photosynthesis and transpiration rates. Using healthy and CVC-affected 'Pêra' sweet orange plants on 'Rangpur' lime rootstock, the leaf gas exchange variables were measured with an open-gas portable photosynthesis system. All plants were watered and the leaf water potencial (Yw) was measured by isopiestic thermocouple psychrometric technique. The net photosynthesis (A) vs. internal leaf CO2 concentration (A/Ci curves) was analyzed. The relative effect of stomatal resistance on photosynthesis (S%) and the estimation of carboxylation efficiency were calculated. The rates of photosynthesis and transpiration, stomatal conductance, and internal leaf CO2 concentration (Ci) were also measured while varying the photosynthetic photon flux density (PPFD). The S% values were approximately 30% greater in infected plants when compared to healthy ones. The light compensation point for diseased plants was higher than in the healthy ones, and the saturation light point in plants with CVC was twofold lower. The lower Yw in diseased plants favours the hypothesis of xylem occlusion, which probably caused a lower water supply to the mesophyll, thus decreasing the photosynthesis and transpiration rates. Nevertheless, there was also a reduction in the photosynthetic metabolic activities, represented by lower carboxylation efficiency and photochemical disturbances that were detected in diseased plants.
650 $acitrus variegated chlorosis
650 $astomata
653 $aA/Ci curves
653 $aCitrus sinensis L
653 $aOsbeck
653 $aphotosynthetic metabolism
653 $aphotosynthetic photon flux density
700 1 $aMACHADO, E. C.
700 1 $aRODRIGUES, J. D.
700 1 $aMEDINA, C. L.
773 $tBrazilian Journal of Plant Physiology, Londrina$gv. 15, n. 2, p. 79-87, 2003.
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Registro original: |
Embrapa Mandioca e Fruticultura (CNPMF) |
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Biblioteca |
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Tipo/Formato |
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| Registros recuperados : 16 | |
| 6. |  | PINTO, J. M.; BOTREL, T. A.; MACHADO, E. C.; FEITOSA FILHO, J. C.; MEDINA, C. L. Aplicacao de CO2, via agua de irrigacao na cultura do melao em ambiente protegido. In: CONGRESSO BRASILEIRO DE ENGENHARIA AGRÍCOLA, 27., 1998, Poços de Caldas. Anais... Lavras: UFLA: SBEA, 1998. v. 1, p. 238-240.| Tipo: Artigo em Anais de Congresso |
| Biblioteca(s): Embrapa Semiárido. |
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| 7. | | PINTO, J. M.; BOTREL, T. A.; MACHADO, E. C.; FEITOSA FILHO, J. C.; MEDINA, C. L. Aplicacao de CO2 via agua de irrigacao na cultura do melao em ambiente protegido. Engenharia Agrícola, Jaboticabal, v. 18, n. 3, p. 1-10, mar. 1999.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: Nacional - B |
| Biblioteca(s): Embrapa Semiárido. |
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| 8. | | MACHADO, E. C.; SCHMIDT, P. T.; MEDINA, C. L.; RIBEIRO, R. V. Respostas da fotossíntese de três espécies de citros a fatores ambientais. Pesquisa Agropecuária Brasileira, Brasília, DF, v. 40, n. 12, p. 1161-1170, dez. 2005 Título em inglês: Photosynthetic responses of three citrus species to environmental factors.| Biblioteca(s): Embrapa Unidades Centrais. |
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| 9. | | MACHADO, E. C.; OLIVEIRA, R. F. de; RIBEIRO, R. V.; MEDINA, C. L.; STUCHI, E. S.; PAVANI, L. C. Deficiência hídrica agrava os sintomas fisiológicos da clorose variegada dos citros em laranjeira 'Natal'. Bragantia, Campinas, v. 66, n. 3, p. 373-379, 2007.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: Internacional - A |
| Biblioteca(s): Embrapa Mandioca e Fruticultura. |
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| 10. | | BASTIANEL, M.; FREITAS-ÁSTUA, J.; NICOLINI, F.; SEGATTI, N.; NOVELLI, V. M.; RODRIGUES, V.; MEDINA, C. L.; MACHADO, M. A. Response of mandarin cultivars and hybrids to citrus leprosis virus. Journal of Plant Pathology, Netherlands, v. 90, n. 2, p. 305-310, 2008.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: Internacional - A |
| Biblioteca(s): Embrapa Mandioca e Fruticultura. |
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| 11. | | MEDINA, C. L.; SANCHES, M. C.; TUCCI, M. L. S.; SOUSA, C. A. F. de; CUZZUOL, G. R. F.; JOLY, C. A. Erythrina speciosa (Leguminosae-Papilionoideae) under soil water saturation: morphophysiological and grouwth responses. Annals of Botany, v. 104, n. 4, p. 671-680, 2009.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: A - 1 |
| Biblioteca(s): Embrapa Meio-Norte. |
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| 12. | | MACHADO, E. C.; OLIVEIRA, R. F. de; RIBEIRO, R. V.; MEDINA, C. L.; STUCHI, E. S.; MARIN, F. R.; SILVA, J. A. B. da; SILVA, S. R. Fluxo de seiva, fotossíntese e condutância estomática em laranjeira 'Natal' com clorose variegada dos citros. In: CONGRESSO BRASILEIRO DE AGROMETEOROLOGIA, 14., 2005, Campinas. "Agrometeorologia, agroclimatologia e agronegócio": caderno de resumos. Campinas: SBA: UNICAMP, 2005. p. 148.| Biblioteca(s): Embrapa Agricultura Digital. |
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| 13. | | MACHADO, E. C.; OLIVEIRA, R. F. de; RIBEIRO, R. V.; MEDINA, C. L.; STUCHI, E. S.; MARIN, F. R.; SILVA, J. A. B.; SILVA, S. R. Fluxo de seiva, fotossíntese e condutância estomática em laranjeira 'Natal' com clorose variegada dos citros. In: CONGRESSO BRASILEIRO DE AGROMETEOROLOGIA, 14., 2005, Campinas. Agrometeorologia, agroclimatologia e agronegócio: anais. Campinas: UNICAMP, 2005. 2 p. CBAgro 2005.| Biblioteca(s): Embrapa Agricultura Digital. |
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| 14. | | MACHADO, E. C.; OLIVEIRA, R. F. de; RIBEIRO, R. V.; MEDINA, C. L.; STUCHI, E. S.; MARIN, F. R.; SILVA, J. A. B. da; SILVA, S. R. da. Fluxo de seiva e fotossíntése em laranjeira 'Natal' com clorose variegada dos citros. Pesquisa Agropecuária Brasileira, Brasília, DF, v.41, n.6, p.911-918, jun. 2006.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: Internacional - A |
| Biblioteca(s): Embrapa Agricultura Digital; Embrapa Unidades Centrais. |
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| 15. | | BOASCARIOL-CAMARGO, R. L.; BERGER, I. J.; SOUZA, A. A.; AMARAL, A. M. do; CARLOS, E. F.; FREITAS-ÁSTUA, J.; TAKITA, M. A.; TARGON, M. L. P. N.; MEDINA, C. L.; REIS, M. S.; MACHADO, M. A. In silico analysis of ESTs from roots of Rangpur lime (Citrus limonia Osbeck) under water stress. Genetics and Molecular Biology, Ribeirão Preto, v. 30, n. 3, p. 906-916, 2007.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: Internacional - A |
| Biblioteca(s): Embrapa Mandioca e Fruticultura. |
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| 16. | | BERNARDI, A. C. de C.; CARMELLO, Q. A. de C.; CARVALHO, S. A. de; MACHADO, E. C.; MEDINA, C. L.; GOMES, M. de M. de A.; LIMA, D. M. Nitrogen, Phosphorus and Potassium fertilization interactions on the photosynthesis of containerized citrus nursery trees. Journal of Plant Nutrition , v. 38, n. 12, p. 1902-1912, 2015.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: A - 2 |
| Biblioteca(s): Embrapa Pecuária Sudeste. |
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| Registros recuperados : 16 | |
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| Nenhum registro encontrado para a expressão de busca informada. |
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