Data/hora: 23/06/2024 12:53:03

Biblioteca(s): | Embrapa Milho e Sorgo.
Data corrente: | 01/09/1997
Data da última atualização: | 12/06/2018
Autoria: | PURCINO, A. A. C.; PAIVA, E.; SILVA, M. R.; ANDRADE, S. R. M.
Afiliação: | ANTONIO ALVARO CORSETTI PURCINO, CNPMS.
Título: | Influence of Azospirillum inoculation and nitrogen supply on grain yield, and carbon: and nitrogen-assimilating enzymes in maize.
Ano de publicação: | 1996
Fonte/Imprenta: | Journal of Plant Nutrition, New York, v. 19, n. 7, p. 1045-1060, 1996.
Idioma: | Inglês
Conteúdo: | Nitrogen (N) supply increased yield, leaf % N at 10 days after silking (DAS) and at harvesting, the contents of ribulose-1,5-bisphosphate carboxylase (RUBISCO) and soluble protein, and the activities of phosphoenolpyruvate carboxylase (PEPC), and ferredoxin-glutamate synthase (fd-GOGAT), but not of glutamine synthetase (GS) for six tropical maize (Zea mays L.) cultivars. Compared to plants fertilized with 10 kg N/ha, plants inoculated with a mixture of Azospirillum sp. (strains Sp 82, Sp 242, and Sp Eng-501) had increased grain % protein, and leaf % N at 10 DAS and at harvest, but not grain yield. Compared to plants fertilized with either 60 or 180 kg N/ha, Azospirillum inoculated plants yielded significantly less, and except for GS activity, which was not influenced by N supply, had lower values for leaf % N at 10 DAS and at harvest, for contents of soluble protein and RUBISCO, and for the activities of PEPC and fd-GOGAT. Yield was positively correlated to leaf % N both at 10 DAS and at harvest to the contents of soluble protein and RUBISCO, and to the activities of PEPC and Fd-GOGAT, but not of GS, when RUBISCO contents and enzyme activities were calculated per g fresh weight/min. However, when enzyme contents and enzyme activities were expressed per mg soluble protein/min, yield was correlated positively to RUBISCO and PEPC, but negatively to GS. These results give syupport to the hypothesis that RUBISCO, fd-GOGAT, and PEPC may be used as biochemical markers for the development of genotypes with (...)
Palavras-Chave: | Enzyme; Fixacao; Maize; Nitrogen fixing.
Thesagro: | Bactéria; Enzima; Inoculação; Milho; Nitrogênio; Nutrição Vegetal; Zea Mays.
Thesaurus Nal: | Azospirillum; plant nutrition.
Categoria do assunto: | W Química e Física
Registro original: | Embrapa Milho e Sorgo (CNPMS)
Exemplares: | CNPMS - (4741-1) - UPC - AP - DD -  -  -  - DIS