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BACKGROUND AND AIMS The germination test currently represents the most used method to assess seed viability in germplasm banks, despite the difficulties caused by the occurrence of seed dormancy. Furthermore, seed longevity can vary considerably across species and populations from different environments, and studies related to the eco-physiological… (More)
Aspergillus terreus was transformed to hygromycin B resistance using a bacterial resistance gene under the control of Aspergillus nidulans regulatory sequences. Southern hybridization of transformants indicated that in most of the cases the vector DNA was integrated into the recipient chromosome in the form of tandem arrays. Transformants were mitotically… (More)
Using filtration enrichment techniques, an Aspergillus terreus arginine auxotrophic strain which contains a mutation that abolishes ornithine transcarbamylase (OTCase) activity has been isolated. This mutant has been genetically transformed with the cloned Aspergillus nidulans OTCase gene. Prototrophic transformants arose at a frequency of about 50… (More)
The Aspergillus terreus gla1 gene, coding for a glucoamylase, has been cloned by heterologous hybridization. The gene is interrupted by four introns and encodes a protein with an N-terminal catalytic domain and a C-terminal starch-binding domain. The expression of the gene is induced by starch and maltose and repressed by glucose.
In the present work, Petunia × hybrida leaf discs maintained on regeneration medium for 8 days were used to assess the effects of genotoxic stress induced by in vitro culture. The investigation was carried out by comparing the response of intact leaves excised from Petunia × hybrida plantlets grown in vitro and the regenerating leaf discs. In situ detection… (More)
The cAMP-dependent protein kinase regulatory network (PKA-RN) regulates metabolism, memory, learning, development, and response to stress. Previous models of this network considered the catalytic subunits (CS) as a single entity, overlooking their functional individualities. Furthermore, PKA-RN dynamics are often measured through cAMP levels in… (More)
An Aspergillus terreus gene (arg1) encoding ornithine carbamoyltransferase (OCTase) has been cloned and sequenced. The deduced amino acid sequence contains a signal peptide suggestive of a mitochondrial location for the A. terreus enzyme. Alignment of the A. terreus OCTase sequence with other OCTases revealed the presence of conserved regions. Northern… (More)
Population dynamics of natural and inoculated industrial wine fermentations have been studied by using a simple molecular biology technique based on mitochondrial DNA restriction analysis profile. The predominance of the inoculated strain in the inoculated fermentations is obvious. A genetic transformation system has been developed for an industrial wine… (More)
Food industries use a great variety of enzymes as additives. The main percentage of them are produced by species of filamentous fungi. In this review we present the strategies to purify and overproduce this kind of enzymes using recombinant DNA techniques.