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Registro Completo |
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Biblioteca(s): |
Embrapa Agrobiologia; Embrapa Meio Norte / UEP-Parnaíba; Embrapa Meio-Norte. |
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Data corrente: |
29/07/1994 |
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Data da última atualização: |
29/07/1994 |
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Autoria: |
SUMMERFIELD, R. J.; HUXLEY, P. A.; DART, P. J.; HUGHES, A. P. |
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Afiliação: |
University of Reading, U.K. |
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Título: |
Some effects of environmental stress on seed yield of cowpea (Vigna unguiculata L.walp) cv. prima. |
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Ano de publicação: |
1976 |
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Fonte/Imprenta: |
Plant and Soil, v.44, p.527-546, 1976. |
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Idioma: |
Inglês
Português |
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Conteúdo: |
Separate experiments examined nodulation and seed yield of cowpea cv. Prima after changes in the level of combined nitrogen from 25 to 0 or 60 ppm N, cycles of wilting and rehydration, and shading to ca 50% full daylight. Plants were grown in the simulated tropical environment of a plastics 'bubble'house and experienced these changes over the growth stages: emergence to first flower, first flower to mid pod-fill or mid pod-fill to maturity. Seed yields of nodulated plants were unaffected by combined nitrogen supply and almost double those of non-nodulated plants (100 g cf 56 g per plant) - due mainly to increases in pod number per plant and mean seed wight. Reducing the nitrogen level from 25 to 0 ppm N, especially between mid pod-fill and maturity, reduced seed yields of non-nodulated plants to 36 g per plant. At the first flowering stage, plants grown without combined nitrogen had nitrogenase activities less than 10% of those supplied with 25 ppm N; 60 ppm N at any stage of development more than halved nitrogenase activity when compared with plants supplied with 25 ppm. Repeated wilting prior to flowering markedly reduced seed yields compared with the unstressed controls (41 g cf 76 g per plant) - mainly by decreasing subsequent pod production. Nodule weight and nitrogenase activity per plant were also much reduced. Wilting after flowering did not reduce yield, and nitrogenase activity was less affected. |
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Palavras-Chave: |
Bean; CAUPI; Estresse; Estresse ambiental; Estresse hidrico; Producao de semente. |
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Thesagro: |
Fósforo; Grão; Potássio; Produção; Temperatura; Vigna Unguiculata. |
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Thesaurus Nal: |
water stress. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02246naa a2200313 a 4500
001 1074385
005 1994-07-29
008 1976 bl --- 0-- u #d
100 1 $aSUMMERFIELD, R. J.
245 $aSome effects of environmental stress on seed yield of cowpea (Vigna unguiculata L.walp) cv. prima.
260 $c1976
520 $aSeparate experiments examined nodulation and seed yield of cowpea cv. Prima after changes in the level of combined nitrogen from 25 to 0 or 60 ppm N, cycles of wilting and rehydration, and shading to ca 50% full daylight. Plants were grown in the simulated tropical environment of a plastics 'bubble'house and experienced these changes over the growth stages: emergence to first flower, first flower to mid pod-fill or mid pod-fill to maturity. Seed yields of nodulated plants were unaffected by combined nitrogen supply and almost double those of non-nodulated plants (100 g cf 56 g per plant) - due mainly to increases in pod number per plant and mean seed wight. Reducing the nitrogen level from 25 to 0 ppm N, especially between mid pod-fill and maturity, reduced seed yields of non-nodulated plants to 36 g per plant. At the first flowering stage, plants grown without combined nitrogen had nitrogenase activities less than 10% of those supplied with 25 ppm N; 60 ppm N at any stage of development more than halved nitrogenase activity when compared with plants supplied with 25 ppm. Repeated wilting prior to flowering markedly reduced seed yields compared with the unstressed controls (41 g cf 76 g per plant) - mainly by decreasing subsequent pod production. Nodule weight and nitrogenase activity per plant were also much reduced. Wilting after flowering did not reduce yield, and nitrogenase activity was less affected.
650 $awater stress
650 $aFósforo
650 $aGrão
650 $aPotássio
650 $aProdução
650 $aTemperatura
650 $aVigna Unguiculata
653 $aBean
653 $aCAUPI
653 $aEstresse
653 $aEstresse ambiental
653 $aEstresse hidrico
653 $aProducao de semente
700 1 $aHUXLEY, P. A.
700 1 $aDART, P. J.
700 1 $aHUGHES, A. P.
773 $tPlant and Soil$gv.44, p.527-546, 1976.
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Registro original: |
Embrapa Meio Norte / UEP-Parnaíba (CPAMN-UEPP) |
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