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| Molinari,María Laura; Boiardi,José Luis. |
| Background: Growth of Gluconacetobacter diazotrophicus with glucose as carbon an energy source has been extensively studied. However, there are no reports in the literature describing growth of G. diazotrophicus in cultures containing sucrose as carbon source. The first step in sucrose pathway and production of levans was investigated. Biomass, levans, gluconic acid and keto gluconic acids production and levansucrase activity were determined in cultures with different sucrose concentration and nitrogen sources. Results: The biomass production was maximal in cultures containing 100 g x L-1 sucrose and inorganic nitrogen. Gluconic acid production was observed under all conditions tested, at levels up to 9 g x L-1 in cultures with sucrose excess and... |
| Tipo: Journal article |
Palavras-chave: Gluconic acid; Keto gluconic acids; Levans; Levansucrase; Sucrose metabolism. |
| Ano: 2013 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582013000300007 |
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| Oliveira, Helena; Universidade de Aveiro; Costa, Armando; Universidade de Aveiro; Santos, Conceição; Universidade de Aveiro. |
| Vineyards production is often affected by diseases as esca and Petri disease and by excess of salt. Phaeomoniella chlamydospora is one of the pathogenic fungi associated to esca disease, but its interaction with the plant under excess of salt remains unknown. Under controlled in vitro conditions, Vitis vinifera L. plants were exposed to 0, 20 and 100 mM NaCl and inoculated with P. chlamydospora. Both inoculation and salt stress decreased the levels of chlorophylls, which was aggravated when both factors were combined. NaCl 100 mM and, mostly, inoculation, decreased maximum fluorescence (Fm), variable fluorescence (Fv) and Fv/Fm. The activity of a-amylase decreased in plants exposed to 100 mM or inoculated but no synergic effect of these factors was... |
| Tipo: Ensaio laboratorial em condições controladas |
Palavras-chave: 5.01.02.01-0; 5.01.03.06-7 Fisiologia de Plantas grapevine; Phaeomoniella chlamydospora; Salt stress; Starch metabolism; Amylase; Sucrose metabolism. |
| Ano: 2013 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/15690 |
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