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Registro Completo |
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Biblioteca(s): |
Embrapa Amazônia Oriental; Embrapa Unidades Centrais. |
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Data corrente: |
04/08/1999 |
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Data da última atualização: |
25/01/2021 |
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Autoria: |
DIAS FILHO, M. B. |
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Afiliação: |
MOACYR BERNARDINO DIAS FILHO, CPATU. |
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Título: |
Physiological responses of two tropical weeds to shade. II. Leaf gas exchange and nitrogen content. |
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Ano de publicação: |
1999 |
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Fonte/Imprenta: |
Pesquisa Agropecuária Brasileira, Brasília, DF, v. 34, n. 6, p. 953-961, jun. 1999. |
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Idioma: |
Inglês |
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Conteúdo: |
Ipomoea asarifolia (Desr.) Roem. & Schultz (Convolvulaceae) and Stachytarpheta cayennensis (Rich) Vahl. (Verbenaceae), two weeds found in pastures and crop areas in the Brazilian Amazonia, Brazil, were grown in controlled environment cabinets under high (800-1000 umol m-2 s-1) and low (200-350 umol m-2 s-1) light regimes during a 40-day period. The objective was to determine the effect to shade on photosynthetic features and leaf nitrogen content of I. asarifolia and S. cayennensis. High-irradiance grown I. asarifolia leaves had significantly higher dark respiration and light satured rates of photosynthesis than low-irradiance leaves. No significant differences for these traits, between treatments, were observed in S. cayennensis. Low-irradiance leaves of both species displayed higher CO2 assimilation rates under low irradiance. High-irradiance grown leaves of both species had less nitrogen per unit of weight. Low-irradiance S. cayennensis had more nitrogen per unit of leaf area than high-irradiance plants; however, I. asarifolia showed no consistent pattern for this variable through time. For S. cayennensis, leaf nitrogen content and CO2 assimilation were inversely correlated to the amount of biomass allocated to developing reproductive structures. These results are discussed in relation to their ecological and weed management implications. |
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Palavras-Chave: |
Brasil; Fertilizer applications; Impoea asarifolia; Ipomoea asarifolia; Leaf nitrogen; Nitrogenio foliar; Tese. |
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Thesagro: |
Adubação Foliar; Fisiologia Vegetal; Fotossíntese; Nitrogênio; Stachytarpheta Cayennensis. |
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Thesaurus Nal: |
Amazonia; nitrogen; photosynthesis; plant physiology. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/AI-SEDE/11431/1/pab395_96i.pdf
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Marc: |
LEADER 02276naa a2200313 a 4500
001 1373193
005 2021-01-25
008 1999 bl uuuu u00u1 u #d
100 1 $aDIAS FILHO, M. B.
245 $aPhysiological responses of two tropical weeds to shade. II. Leaf gas exchange and nitrogen content.
260 $c1999
520 $aIpomoea asarifolia (Desr.) Roem. & Schultz (Convolvulaceae) and Stachytarpheta cayennensis (Rich) Vahl. (Verbenaceae), two weeds found in pastures and crop areas in the Brazilian Amazonia, Brazil, were grown in controlled environment cabinets under high (800-1000 umol m-2 s-1) and low (200-350 umol m-2 s-1) light regimes during a 40-day period. The objective was to determine the effect to shade on photosynthetic features and leaf nitrogen content of I. asarifolia and S. cayennensis. High-irradiance grown I. asarifolia leaves had significantly higher dark respiration and light satured rates of photosynthesis than low-irradiance leaves. No significant differences for these traits, between treatments, were observed in S. cayennensis. Low-irradiance leaves of both species displayed higher CO2 assimilation rates under low irradiance. High-irradiance grown leaves of both species had less nitrogen per unit of weight. Low-irradiance S. cayennensis had more nitrogen per unit of leaf area than high-irradiance plants; however, I. asarifolia showed no consistent pattern for this variable through time. For S. cayennensis, leaf nitrogen content and CO2 assimilation were inversely correlated to the amount of biomass allocated to developing reproductive structures. These results are discussed in relation to their ecological and weed management implications.
650 $aAmazonia
650 $anitrogen
650 $aphotosynthesis
650 $aplant physiology
650 $aAdubação Foliar
650 $aFisiologia Vegetal
650 $aFotossíntese
650 $aNitrogênio
650 $aStachytarpheta Cayennensis
653 $aBrasil
653 $aFertilizer applications
653 $aImpoea asarifolia
653 $aIpomoea asarifolia
653 $aLeaf nitrogen
653 $aNitrogenio foliar
653 $aTese
773 $tPesquisa Agropecuária Brasileira, Brasília, DF$gv. 34, n. 6, p. 953-961, jun. 1999.
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Registro original: |
Embrapa Amazônia Oriental (CPATU) |
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Registro Completo
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Biblioteca(s): |
Embrapa Amazônia Oriental; Embrapa Recursos Genéticos e Biotecnologia. |
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Data corrente: |
16/03/2023 |
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Data da última atualização: |
16/03/2023 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
B - 1 |
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Autoria: |
OLIVEIRA, L. C. de; NAKASONE, A. K.; SILVA, C. S.; BONFIM, K. |
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Afiliação: |
LUANA CARDOSO DE OLIVEIRA, UNIVERSIDADE FEDERAL DO PARÁ; ALESSANDRA KEIKO NAKASONE, CPATU; CAIO SANTOS SILVA, UNIVERSIDADE FEDERAL DO PARÁ; KENNY BONFIM DE ARRUDA CARVALHO, Cenargen. |
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Título: |
Characterization and variability of strains of Xanthomonas axonopodis pv. passiflorae from the state of Pará, Brazil. |
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Ano de publicação: |
2023 |
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Fonte/Imprenta: |
Revista Ceres, Viçosa, v. 70, n. 1, p. 124-132, jan./feb. 2023. |
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DOI: |
https://doi.org/10.1590/0034-737X202370010014 |
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Idioma: |
Inglês |
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Conteúdo: |
Bacterial spot, caused by Xanthomonas axonopodis pv. passiflorae, is a disease that has limited the cultivation of passionfruit in various orchards in Brazil. The objective of this work is to characterize and evaluate the variability of 29 strains of X. axonopodis pv. passiflorae from different municipalities producing yellow passionfruit in the state of Pará. The characterization was performed by the biochemical methods of KOH solubility, oxidase and Bactray, and the molecular methods of Xapas-F, Xapas-Ri and Xapas-Ro primers. The variability was evaluated by pathogenicity test and RAPD (randomly amplified polymorphic DNA). The strains of X. axonopodis pv. passiflorae were Gram-negative and oxidase-negative, and tests with the Bactray kit showed no relation between the collection municipality and group composition. The Xapas-F/Ri/Ro primers were specific for the strains. The primers used amplified 118 polymorphic bands in the RAPD reactions and the highest genetic similarity was between the strains PA15 and PA16. As the pathogenicity test evidenced a pathogenic variability, the strains PA2.1, PA4.5, PA14, PA4.2, PA4.1, PA4.6, PA3.4 and PA4.3 present the highest severity values for the disease. The strains of X. axonopodis pv. passiflorae show characteristics typical of the species, and genetic and pathogenic variability among them. |
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Palavras-Chave: |
Bacterial spot; Biochemical tests. |
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Thesagro: |
Doença de Planta; Mancha Bacteriana; Maracujá; Passiflora Edulis Flavicarpa. |
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Thesaurus NAL: |
Detection. |
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Categoria do assunto: |
H Saúde e Patologia |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/doc/1152411/1/CharacterizationVariabilityStrainsXanthomonas.pdf
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Marc: |
LEADER 02174naa a2200253 a 4500
001 2152411
005 2023-03-16
008 2023 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.1590/0034-737X202370010014$2DOI
100 1 $aOLIVEIRA, L. C. de
245 $aCharacterization and variability of strains of Xanthomonas axonopodis pv. passiflorae from the state of Pará, Brazil.$h[electronic resource]
260 $c2023
520 $aBacterial spot, caused by Xanthomonas axonopodis pv. passiflorae, is a disease that has limited the cultivation of passionfruit in various orchards in Brazil. The objective of this work is to characterize and evaluate the variability of 29 strains of X. axonopodis pv. passiflorae from different municipalities producing yellow passionfruit in the state of Pará. The characterization was performed by the biochemical methods of KOH solubility, oxidase and Bactray, and the molecular methods of Xapas-F, Xapas-Ri and Xapas-Ro primers. The variability was evaluated by pathogenicity test and RAPD (randomly amplified polymorphic DNA). The strains of X. axonopodis pv. passiflorae were Gram-negative and oxidase-negative, and tests with the Bactray kit showed no relation between the collection municipality and group composition. The Xapas-F/Ri/Ro primers were specific for the strains. The primers used amplified 118 polymorphic bands in the RAPD reactions and the highest genetic similarity was between the strains PA15 and PA16. As the pathogenicity test evidenced a pathogenic variability, the strains PA2.1, PA4.5, PA14, PA4.2, PA4.1, PA4.6, PA3.4 and PA4.3 present the highest severity values for the disease. The strains of X. axonopodis pv. passiflorae show characteristics typical of the species, and genetic and pathogenic variability among them.
650 $aDetection
650 $aDoença de Planta
650 $aMancha Bacteriana
650 $aMaracujá
650 $aPassiflora Edulis Flavicarpa
653 $aBacterial spot
653 $aBiochemical tests
700 1 $aNAKASONE, A. K.
700 1 $aSILVA, C. S.
700 1 $aBONFIM, K.
773 $tRevista Ceres, Viçosa$gv. 70, n. 1, p. 124-132, jan./feb. 2023.
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