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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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| Registros recuperados : 256 | |
| 78. |  | DIAS-FILHO, M. B. Síndrome da morte do capim-marandu. In: ENCONTRO INTERNACIONAL DA PECUÁRIA DA AMAZÔNIA, 1., 2008, Belém, PA. Meio ambiente e pecuária: [anais]. Belém, PA: FAEPA; Instituto Frutal; SEBRAE-PA, 2008. 1 CD-ROM.| Tipo: Artigo em Anais de Congresso / Nota Técnica |
| Biblioteca(s): Embrapa Amazônia Oriental. |
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| Registros recuperados : 256 | |
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