Roberta Marra

Roberta Marra
University of Naples Federico II | UNINA · Department of Agriculture

Food Science and Technology

About

33
Publications
26,572
Reads
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3,752
Citations
Additional affiliations
May 2015 - December 2016
Italian National Research Council
Position
  • Researcher
August 2012 - July 2014
University of Naples Federico II
Position
  • PostDoc Position
Education
January 2005 - February 2008
November 1994 - December 1999

Publications

Publications (33)
Article
Full-text available
Beneficial fungal strains of the genus Trichoderma are used as biofungicides and plant growth promoters. Trichoderma strains promote the activation of plant defense mechanisms of action, including the production of phenolic metabolites. In this work, we analyzed the effects of selected Trichoderma strains (T. asperellum KV906, T. virens GV41, and T...
Conference Paper
PLANT EXTRACTS AGAINST MELOIDOGYNE INCOGNITA IN FARMS UNDER BIOLOGICAL AND INTEGRATED MANAGEMENTS Three commercial products based on plant extracts (Oikos, Garland and Tequil) were evaluated against Meloidogyne incognita on two varieties of tomato in two different sites of Southern Italy. These products were applied singly or in combination, and w...
Article
Full-text available
In microbial cultures the production of secondary metabolites is affected by experimental conditions, and the discovery of novel compounds is often prevented by the re-isolation of known metabolites. To limit this, it is possible to cultivate microorganisms by simulating naturally occurring interactions, where microbes co-exist in complex communiti...
Article
Full-text available
Endophytic fungi have a great influence on plant health and growth, and are an important source of bioactive natural compounds. Organic extracts obtained from the culture filtrate of an endophytic strain of Talaromyces pinophilus isolated from strawberry tree (Arbutus unedo) were studied. Metabolomic analysis revealed the presence of three bioactiv...
Conference Paper
Full-text available
Among medicinal plants, St. John’s wort (Hypericum perforatum) is cropped on reduced extensions in both Italy and Poland for the extraction of hypericin, hyperforin and other compounds of valuable pharmaceutical interest. Recently, the evidence that many endophytic fungi are able to synthesize important bioactive metabolites of plant origin has sti...
Conference Paper
Full-text available
Beneficial microbes biosynthesize secondary metabolites for competition, symbiosis, parasitism or pathogenesis with other organisms. Some of these compounds have been associated, directly and/or indirectly through the plant, to the biocontrol of phytopathogens, and to the activity of many beneficial microbes used as biopesticides or biofertilizers....
Article
Full-text available
Trichoderma based products are considered an alternative to synthetic pesticides and fertilizers. These Trichoderma spp. are among the most studied and applied fungal BCAs in industry and agriculture and are known to secrete several secondary metabolites with different biological activities. The analysis of metabolic profiles (the 'metabolome') of...
Poster
Full-text available
The traditional methods of pest management with the employment of chemical pesticides are caused a big accumulation of pollution in environmental matrixes. In order to reduce this risk, there have been an increasing for utilization of biocontrol agents against the pest insects in the last ten years. The aim of this research was to find and identify...
Article
Full-text available
Fungi belonging to the genus Trichoderma are among the most active and ecologically successful microbes found in natural environments, as they are able to use a variety of substrates and affect the growth of other microbes and virtually any plant species. We isolated and characterized a novel type II hydrophobin secreted by the biocontrol strain MK...
Article
Full-text available
Trichoderma are ubiquitous soil fungi that include species widely used as biocontrol agents in agriculture. Many isolates are known to secrete several secondary metabolites with different biological activities towards plants and other microbes. Harzianic acid (HA) is a T. harzianum metabolite able to promote plant growth and strongly bind iron. In...
Article
Full-text available
Governing bodies throughout the world, particularly in Europe, are now implementing legislative mandates with the objective of decreasing dependence on pesticides in agriculture to increase consumer and environmental safety. In order to reduce the risks associated with pesticide applications and reduce dependency on their use, Directives will promo...
Article
Full-text available
Beneficial microbes typically produce bioactive molecules that can affect the interactions of plants with their pathogens. Many secondary metabolites may also have antibiotic properties, which enable the producing microbe to inhibit and/or kill other microorganisms i.e. competing for a nutritional niche. Indeed, some of these compounds have been fo...
Article
Full-text available
Fungi of the genus Sepedonium have been studied for their properties as antagonist agents of various plant pathogens, as well as antibiotic and pigment producers. We investigated the antimi-crobial ability of S. chrysospermum strain 704 isolated from fruit bodies of wild basidiomycetes and found to be not pathogenic on cultivated mushrooms. A stron...
Article
Agriculture-relevant microbes are considered to produce secondary metabolites during processes of competition with other micro- and macro-organisms, symbiosis, parasitism or pathogenesis. Many different strains of the genus Trichoderma, in addition to a direct activity against phytopathogens, are well known producers of secondary metabolites and co...
Article
A sterile red fungus (SRF) isolated from cortices of roots of both wheat (Triticum aestivum cv. Gamenya) and ryegrass (Lolium rigidum cv. Wimmera) was found to protect the hosts from phytopathogens and promote plant growth. In this work, the major secondary metabolites produced by this SRF were analysed, and their antibiotic and plant-growth-promot...
Article
Full-text available
Brassica napus cultivars resistant to Leptosphaeria maculans have been widely used to control the blackleg disease. The B. napus cv. Surpass 400, with major gene resistance derived from B. rapa ssp. sylvestris, was inoc-ulated either with a virulent or an avirulent isolate of L. maculans, and changes in the cotyledon protein patterns were studied b...
Article
A Trichoderma harzianum strain, isolated from composted hardwood bark in Western Australia, was found to produce a metabolite with antifungal and plant growth promoting activity. The structure and absolute configuration of the fungal compound, harzianic acid (1), were determined by X-ray diffraction studies. Harzianic acid showed antibiotic activit...
Article
Full-text available
Successful biocontrol interactions often require that the beneficial microbes involved are resistant or tolerant to a variety of toxicants, including antibiotics produced by themselves or phytopathogens, plant antimicrobial compounds, and synthetic chemicals or contaminants. The ability of Trichoderma spp., the most widely applied biocontrol fungi,...
Article
Strains of Trichoderma spp. produce numerous bioactive secondary metabolites. The in vitro production and antibiotic activities of the major compounds synthesized by Trichoderma harzianum strains T22 and T39 against Leptosphaeria maculans, Phytophthora cinnamomi and Botrytis cinerea were evaluated. Moreover, the eliciting effect of viable or nonvia...
Article
Full-text available
Secondary metabolites play a pivotal role in the antagonistic activities of some biocontrol species of Trichoderma resulting in the suppression of plant pathogens, but their involvement in complex interactions with plants has not been specifically studied. In this work the major secondary metabolites produced by biocontrol strains of Trichoderma (T...
Article
Full-text available
The complexity of the molecular mechanisms that regulate the three-way interaction between plants, pathogens and biocontrol fungi is astonishing. Many of the factors involved have been poorly investigated, even though they may determine the establishment or failure of a pathogenic process. Our actual understanding suggests that the influence of an...
Article
Full-text available
Biological control involves the use of beneficial organisms, their genes, and/or products, such as metabolites, that reduce the negative effects of plant pathogens and promote positive responses by the plant. Disease suppression, as mediated by biocontrol agents, is the consequence of the interactions between the plant, pathogens, and the microbial...
Article
Trichoderma harzianum T22 is one of the Trichoderma isolates most used as active ingredient in commercial bio-fungicides and bio-fertilizers. In addition to their mycoparasitic abilities, many Trichoderma strains can colonize and grow in association with plant roots and can significantly increase plant growth, development and systemic resistance to...
Chapter
Full-text available
Trichoderma-based biofungicides are a reality in agriculture, with more than 50 formulations available today as registered products worldwide. Several strategies have been applied to identify the main genes and compounds involved in this complex cross-talk between the fungal antagonist and the microbial pathogen, as mediated by the plant. Proteome...
Article
Full-text available
The main molecular factors involved in the complex interactions occurring between plants (bean), two different fungal pathogens (Botrytis cinerea, Rhizoctonia solani) and an antagonistic strain of the genus Trichoderma were investigated. Two-dimensional (2-D) electrophoresis was used to analyze separately collected proteomes from each single, two-...
Article
Trichoderma harzianum strains T22 and T39 are two micro-organisms used as active agents in a variety of commercial biopesticides and biofertilizers and widely applied amongst field and greenhouse crops. The production, isolation, biological and chemical characterization of the main secondary metabolites produced by these strains are investigated. O...

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Projects

Projects (3)
Project
New secondary metabolites used as insecticidal compounds against insect pest in agriculture
Project
Unravelling the ecological relationships among endophytic fungi, their host plants and the related pests and pathogens, as mediated by bioactive secondary metabolites, in the scenario of this unique site.