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| ABRÃO,MARLUCI MUNDIN; MAZZAFERA,PAULO. |
| Pesquisas acerca da fisiologia de plantas em resposta ao ataque de nematóides normalmente são feitas com doses altas de inóculo, quer sejam ovos ou juvenis de segundo estágio. Diferentemente, as avaliações da resistência de plantas a nematóides em programas de melhoramento são realizadas com doses bastante inferiores. Neste estudo acompanhou-se a variação de alguns parâmetros fisiológicos em algodão, em resposta à aplicação de baixas doses de inóculo de Meloidogyne incognita raça 3. Duas cultivares foram utilizadas, Acala e IAC-20, respectivamente suscetível e moderadamente resistente. Plântulas com duas folhas receberam 500 ou 5.000 ovos e, 90 dias depois, foram comparadas a plantas que não receberam o inóculo, quanto à massa da parte aérea e raízes,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Algodão; Gossypium hirsutum; Nematóide; Meloidogyne incognita; Alterações fisiológicas; Nível de inóculo. |
| Ano: 2001 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052001000100003 |
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| STANCATO,GIULIO C.; MAZZAFERA,PAULO; BUCKERIDGE,MARCOS S.. |
| Considering the performance of CAM epiphytes under high levels of radiation or in shaded environments, with growth rate proportional to light intensity, the objective of this work was to evaluate the effects of long-term light stress on the growth of a Brazilian epiphytic orchid, Cattleya forbesii Lindl. X Laelia tenebrosa Rolfe. Two groups of plants were used in the first experiment, one under 90% (<FONT FACE=Symbol>@</FONT> 1,650 µmol.m-2.s-1) of Photosynthetically Active Radiation (PAR) and the other maintained under 22.5% (<FONT FACE=Symbol>@</FONT> 400 µmol.m-2.s-1). In the second experiment the diffusive resistance, transpiration rate and fluorescence levels were monitored for plants that were under 22.5% of PAR, under 90% and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Photoinhibition; Storage; Orchids; Pseudobulb. |
| Ano: 2002 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042002000200011 |
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| MAZZAFERA,PAULO; SOAVE,DAYSE; ZULLO,MARCO ANTONIO TEIXEIRA; GUERREIRO FILHO,OLIVEIRO. |
| The oil content was determined in seeds of several continental African species of the coffee germplasm bank of Instituto Agronômico de Campinas, State of São Paulo, Brazil. Oil was extracted from seeds with hexane in Soxhlet apparatus. Due to the economic importance, C. arabica and C. canephora have been the best studied species concerning oil content and composition, and the results obtained are in agreement with the reported in the literature. On the other hand, only one report in the literature describes the results of oil analyses in other few species of the African continent, although it does not allow comparison with our results. The oil content of most of the species varied from 9 to 15%, therefore, similar to the range observed for C. arabica and... |
| Tipo: Info:eu-repo/semantics/report |
Palavras-chave: African coffee species; Coffea; Oil content. |
| Ano: 1998 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87051998000100006 |
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| BAÚ,SANDRA M. T.; MAZZAFERA,PAULO; SANTORO,LUIZ G.. |
| It has been reported that Coffea arabica seeds contain as the main reserve protein, a legumin-like protein, constituted of two subunits, alpha and beta, of approximately 35 and 20 kDa. In this work the seed proteins of several coffee species and varieties were investigated by SDS-PAGE and gel filtration. No differences were observed in the electrophoretic profiles among varieties of C. arabica, however, marked differences were observed among species, or even among individuals of some species. In general, the molecular weight of the subunits alpha and beta accounted for a monomer of 48 to 62 kDa. However, native molecular weight obtained by gel filtration showed that for most of the species there is association of 6 of such proteins, in a hexamer. The most... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Coffea; Legumin; Endosperm. |
| Ano: 2001 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-31312001000100004 |
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| CARNEIRO,RUI G.; MAZZAFERA,PAULO; FERRAZ,LUIZ CARLOS C.B.; MURAOKA,TAKASHI; TRIVELIN,PAULO CESAR O.. |
| Two soybean (Glycine max) cultivars were used in this study, Ocepar 4, rated as moderately resistant to Meloidogyne incognita race 3 but susceptible to M. javanica, and 'BR 16', susceptible to both nematodes. The effect of nematodes infection on the uptake and transport of N, P and Ca to the shoot was studied in plants growing in a split root system. The upper half was inoculated with 0, 3,000, 9,000 or 27,000 eggs/plant while the lower half received 15N, 32P or 45Ca. Infected plants showed an increase of root but a decrease of shoot mass with increasing inoculum levels. In general, total endogenous nutrients increased in the roots and tended to decrease in the shoots with increasing inoculum levels. When concentrations were calculated, there was an... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Mineral nutrition; Nematodes; Nutrient uptake. |
| Ano: 2002 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-41582002000200004 |
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