Data/hora: 12/06/2024 19:07:45

Biblioteca(s): | Embrapa Agrobiologia; Embrapa Meio Norte / UEP-Parnaíba; Embrapa Meio-Norte.
Data corrente: | 29/07/1994
Data da última atualização: | 29/07/1994
Autoria: | SUMMERFIELD, R. J.; HUXLEY, P. A.; DART, P. J.; HUGHES, A. P.
Afiliação: | University of Reading, U.K.
Título: | Some effects of environmental stress on seed yield of cowpea (Vigna unguiculata L.walp) cv. prima.
Ano de publicação: | 1976
Fonte/Imprenta: | Plant and Soil, v.44, p.527-546, 1976.

Idioma:

Inglês
Português

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.
Palavras-Chave: | Bean; CAUPI; Estresse; Estresse ambiental; Estresse hidrico; Producao de semente.
Thesagro: | Fósforo; Grão; Potássio; Produção; Temperatura; Vigna Unguiculata.
Thesaurus Nal: | water stress.
Categoria do assunto: | --
Registro original: | Embrapa Meio Norte / UEP-Parnaíba (CPAMN-UEPP)

Exemplares:

CPAMN - (5786-1) - ADC - SP - -- - S 10666 -  - S 10666 - DIS
CPAMN-UEPP - (3470-1) - EMB - SP - -- -  -  - 1993.04994 - DIS
CNPAB - (1950-1) - ADC - SP - -- -  -  - 2000823 - DIS