Raul A Sperotto

Raul A Sperotto
Universidade do Vale do Taquari - UNIVATES · Programa de Pós-Graduação em Biotecnologia (PPGBiotec)

PhD
Assistant Professor and Researcher

About

97
Publications
25,381
Reads
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2,336
Citations
Citations since 2017
52 Research Items
1766 Citations
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20172018201920202021202220230100200300
20172018201920202021202220230100200300
20172018201920202021202220230100200300
Introduction
I am interested in plant responses to environmental stresses, using plant physiology, molecular biology, biochemistry, cell biology, and bioinformatic techniques to understand these defense responses.
Additional affiliations
February 2022 - present
Universidade Federal de Pelotas
Position
  • Professor permanente
August 2011 - present
Universidade do Vale do Taquari - UNIVATES
Position
  • Professor (Assistant)

Publications

Publications (97)
Article
Full-text available
Forest structure and function strongly depend on and concurrently influence environmental conditions. Tree performance is generally governed by its genetics and environment; thus, recent hotspots in this field include tree genotype × environment, phenotype × environment, and functional trait × environment interactions. The editorial, review, and 22...
Article
Natural products derived from native plant species may be an alternative for the control of invasive exotic plants, thus reducing the use of synthetic herbicides. The present study evaluated the phytotoxicity of the essential oil of Hesperozygis ringens (Benth.) Epling, a native plant to the Pampa Biome, as an alternative for the control of Eragros...
Article
Full-text available
Copper (Cu) is essential to plants but can also be harmful due to Fenton chemistry. Because of that, it is necessary to keep Cu within a narrow concentration limit. Plants evolved mechanisms to sense Cu and precisely regulate uptake and accumulation to avoid both deficiency and toxicity. However, plants experience variable Cu levels in soils, both...
Patent
Full-text available
A presente invenção descreve um processo de produção de nanopartículas de carbono. Ainda, a presente invenção refere-se às ditas nanopartículas de carbono e seus usos na modulação do crescimento e da produtividade de plantas. Mais especificamente, a presente invenção compreende um processo de produção de nanopartículas de carbono por pirólise de bi...
Chapter
In humans, zinc deficiency can affect a large number of populations and may cause decreased height, diarrhea, and pneumonia, and also result in higher infant mortality rates. Zn deficiency may appear due to the food produced in ïnfertile lands and also due to the consumption of low Zn foods. Cereal-based diets such as rice (O. sativa L.) are more l...
Article
Crop infestation species have acquired resistance to herbicides, stimulating the search for new control methods. Plants secondary metabolites can hold more sustainable alternatives, as they can be used for development of natural herbicides. This study evaluated phytotoxic effects of aqueous extracts of Ilex paraguariensis leaves on Conyza bonariens...
Chapter
Full-text available
PANC são espécies de plantas que possuem uma ou mais parte da sua estrutura comestível, e que não são consumidos usualmente. Diante disso, esse protocolo visa aplicação alimentar dessas plantas no preparo de sorvetes e sorbet, buscando estimular seu uso pela população.
Article
Rice is the basic food for over half the global population. Paddy cultivation is limited by environmental stressors, which tend to worsen with climate change. In addition, an increase in food demand is expected soon. Therefore, innovative agricultural technologies capable of increasing food production without increasing agricultural frontiers are n...
Article
Full-text available
GSTs (Glutathione S-transferases) are known to catalyze the nucleophilic attack of the sulfhydryl group of reduced glutathione (GSH) on electrophilic centers of xenobiotic compounds, including insecticides and acaricides. Genome analyses of the polyphagous spider mite herbivore Tetranychus urticae (two-spotted spider mite) revealed the presence of...
Article
Inoculation of symbiotic N 2 -fixing rhizobacteria (rhizobia) in legumes is an alternative to reduce synthetic N fertiliser input to crops. Even though common bean benefits from the biological N 2 fixation carried out by native rhizobia isolates, the low efficiency of this process highlights the importance of screening new strains for plant inocula...
Article
Hulls are considered residues from rice production, and due to its low commercial value, there is little interest in developing biotechnological approaches for its reuse. However, the biological pre-treatment can be a safe and environmentally friendly alternative for developing new uses for this waste material. Therefore, this work aimed to select...
Article
Full-text available
Cultivated rice ( Oryza sativa L.) is frequently exposed to multiple stresses, including Schizotetranychus oryzae mite infestation. Rice domestication has narrowed the genetic diversity of the species, leading to a wide susceptibility. This work aimed to analyze the response of two African rice species ( Oryza barthii and Oryza glaberrima ), weedy...
Article
It is largely known that low temperature stress can affect rice (Oryza sativa L.) development and yield. However, most studies have focussed on unique and uninterrupted cold treatment, which is not representative of cold conditions for early sowing in temperate and subtropical areas where cold nights are followed by warm days during early vegetativ...
Article
Full-text available
iron (fe) is an essential micronutrient that is frequently inaccessible to plants. Rice (Oryza sativa L.) plants employ the combined Strategy for fe uptake, which is composed by all features of Strategy ii, common to all poaceae species, and some features of Strategy i, common to non-poaceae species. to understand the evolution of fe uptake mechani...
Article
Copper (Cu) is an essential element for plants, especially in photosynthesis, as it is required for plastocyanin function in electron transfer reactions at thylakoid membranes. In Arabidopsis thaliana, Cu deficiency leads to the Cu economy response, in which plants prioritize Cu usage by plastocyanin in detriment of non-essential cupric proteins. I...
Article
Rice (Oryza sativa L.) ssp. indica is the most cultivated species in the South of Brazil. However, these plants face low temperature stress from September to November, which is the period of early sowing, affecting plant development during the initial stages of growth, and reducing rice productivity. This study aimed to characterize the root respon...
Article
Full-text available
Incidence of cold during early stages is an obstacle for the growing progress of rice plants. Cold stress has strong negative effects on photosynthetic activity. Previously, our group evaluated plant survival of 90 indica rice genotypes after cold treatment. Two sister lines were characterized as cold-tolerant and cold-sensitive. Transcriptomic ana...
Article
Full-text available
Advancements in genetically modified herbicide tolerance technology opened a new way to manage weed populations in crop fields. Since then, many important genetically modified crops that are tolerant to various herbicides have been developed and commercialized. Herbicides primarily act by disrupting key enzymes involved in essential metabolic or ph...
Article
Full-text available
We investigated the immobilization of a tetrameric Kluyveromyces lactis β-galactosidase (EC: 3.2.1.23) (KL-Gal) on Immobead 150 using different support modification strategies. Immobead support was modified using an acid solution of H2SO4:HNO3 (3:1) (Immobead-Ac) or 5 % (v/v) glutaraldehyde (Immobead-Glu). Its unmodified form (Immobead) was also te...
Article
One of the most common agricultural wastes generated in rice producing countries, rice hull (RH) is considered an environmental problem due to increased rice production and RH accumulation, especially because natural degradation in the environment is very difficult and time‐consuming. Currently, RH is mostly used as bed for broiler chickens or burn...
Article
Full-text available
In this study, we isolated Lactobacillus spp. from bovine raw milk and artisanal cheese from southern Brazil, and evaluated their technological and probiotic potential to select new isolates for producing healthy fermented dairy foods with differentiated tastes and flavours. We obtained 48 new lactobacilli isolates, which were isolated from raw mil...
Article
Full-text available
Rice is the staple food for over half of the world’s population. Infestation of Schizotetranychus oryzae (Acari: Tetranychidae) causes great losses in rice productivity. To search for rice genotypes that could better tolerate S. oryzae infestation, we evaluated morphological and production parameters in Brazilian cultivars, and identified two culti...
Article
Full-text available
Common bean (Phaseolus vulgaris) plants are one of the most important legumes for human consumption due to its nutritional value and the fact it is rich in protein, iron, carbohydrates, and bioactive compounds. Diseases in common bean plants caused by soil-borne pathogens cause important economic losses in the world. Rhizobia is a well-known bacter...
Article
Ilex paraguariensis A.St.-Hil. is an arboreal species whose leaves are used in the preparation of mate and in the cosmetics and food industries. Due to diffi culty found in the sexual propagation of the species, this paper aimed to test effi ciency of indolebutyric acid (IBA) in saplings production from semi-woody cuttings. On the fi rst experiment...
Article
Full-text available
We studied the modification of Immobead 150 support by either introducing aldehyde groups using glutaraldehyde (Immobead‐Glu) or carboxyl groups through acid solution (Immobead‐Ac) for enzyme immobilization by covalent attachment or ion exchange, respectively. These two types of immobilization were compared with the use of epoxy groups that are now...
Article
Full-text available
Plant nutrient uptake is performed mostly by roots, which have to acquire nutrients while avoiding excessive amounts of essential and toxic elements. Apoplastic barriers such as the casparian strip and suberin deposition block free diffusion from the rhizosphere into the xylem, making selective plasma membrane transporters able to control elemental...
Article
Full-text available
It is common to see crop farmers struggling to solve herbivore infestations. Normally, worry starts when herbivore population increases and leaf damage is apparent. Whatever the treatment chosen by the farmer (chemical or biological) to control it, yield and productivity are the final and most important characteristics they would like to see unaffe...
Chapter
More than two billion people suffer from iron (Fe) deficiency, and the development of Fe-enriched crops could help to alleviate this problem. Event though major advances in Fe uptake from soil, xylem and phloem loading and grain sink strength have been made during the last years, several gaps in the long way between soil and grains still need to be...
Chapter
Full-text available
The growing interest in the Oryza genus comes from the feasibility of studying genome evolution of these closely related species, as well as the direct impact of identifying desirable phenotypes that could be transferred to Oryza sativa, one of the world’s most important cereals. Among the Oryza species, Oryza brachyantha is unique: it is highly di...
Article
Full-text available
Key message: Cold-tolerance in rice may be related to increased cellulose deposition in the cell wall, membrane fatty acids unsaturation and differential expression of several newly identified genes. Low temperature exposure during early vegetative stages limits rice plant's growth and development. Most genes previously related to cold tolerance i...
Article
Currently, global demand for energy has grown and the search for new ecological energy sources is one of the mostly significant issues we face. The digestion of alternative sources of carbon in anoxic environment produces gas of high calorific value, which is a promising source of alternative energy. Thus, this work aimed to evaluate the biogas pro...
Article
High levels of Schizotetranychus oryzae phytophagous mite infestation on rice leaves can severely affect productivity. Physiological characterization showed that S. oryzae promotes a decrease in chlorophyll concentration and the establishment of a senescence process in rice leaves. Late-infested leaves also present high levels of superoxide radical...
Article
Minimal information exists on whole-plant dynamics of mineral flow. Understanding these phenomena in a model plant such as rice could help in the development of nutritionally enhanced cultivars. A whole-plant mineral accumulation study was performed in rice (cv. Kitaake), using sequential harvests during reproductive development panicle exertion, g...
Article
Full-text available
Oryza sativa, the common cultivated rice, is one of the most important crops for human consumption, but production is increasingly threatened by abiotic stresses. Although many efforts have resulted in breeding rice cultivars that are relatively tolerant to their local environments, climate changes and population increase are expected to soon call...
Article
Tanneries are an important piece to garments industry and economy, however, the wastewater produced by these matrix may contain aggressive chemical components, heavy metals such as Chromium, to the environmental and consequently to humans. The chemical treatment for the tanneries wastes are very expensive. In this sense, the vermiculture, the organ...
Article
Full-text available
RESUMO A contaminação de hortaliças por micro-organismos patogênicos está diretamente relacionada com a qualidade das águas de irrigação utilizadas na agricultura e com o solo onde se encontram. Com o objetivo de se verificar as condições empregadas na produção de alface (Lactuca sativa L.) em três pequenas propriedades do interior do Rio Grande do...
Article
Despite its importance in growth and cell division, iron metabolism is still poorly understood in microorganisms, especially in Gram-positive bacteria. In this work, we used RNA sequencing technology to elucidate global mechanisms involved in iron starvation resistance in Paenibacillus riograndensis SBR5, a potential plant growth-promoting bacteriu...
Article
Exposure to low temperature during germination and vegetative growth is a limiting factor to the establishment and development of rice seedlings. Higher cold tolerance of japonica than indica subspecies is well documented. However, reports of cold tolerance in indica genotypes are rare. We screened a large number of indica rice genotypes for cold t...
Article
The Taquari Valley has several food industries and tanneries which release their effluents into the Taquari River, as well as a cemetery in a Permanent Preservation Area in Muçum town. This study performed physicochemical and microbiological analyses of water from before and after three Taquari River sites considered potentially polluting and compa...
Article
Full-text available
Hundreds of different micro organisms are attached to the surface of roots. Therefore, it is not surprising that plants have the ability to distinguish threatening intruders from beneficial microbiota (Toth and Stacey, 2015). Pathogens can be discriminated by plant cells through a myriad of plasma membrane and intracellular receptors that recognize...
Article
Infestation of phytophagous mite Schizotetranychus oryzae in rice causes critical yield losses. To better understand this interaction, we employed Multidimensional Protein Identification Technology (MudPIT) approach to identify differentially expressed proteins. We detected 18 unique proteins in control and 872 in infested leaves, respectively, alo...
Article
Background: In the current agricultural model, the massive use of chemical fertilizer causes environmental and economic losses. Inoculation of plant growth promoting nitrogen fixing bacteria is an alternative to the use of nitrogen, phosphorous, and potassium fertilizers. In this study, rhizobia strains isolated from common bean (Phaseolus vulgari...
Article
Rice is cultivated in approximately 150 million hectares around the world, and its annual yield is close to 610 million tons [1]. However, the estimates for the potential losses caused by animal pests are around 25% worldwide [2]. One important cause of these losses is the infestation of phytophagous mites, which can cause drastic reductions in pro...
Article
Abiotic stresses may result in significant losses in rice grain productivity. Protein regulation by the ubiquitin/proteasome system has been studied as a target mechanism to optimize adaptation and survival strategies of plants to different environmental stresses. This paper aimed at highlighting recent discoveries about the roles ubiquitination ma...
Article
Phytophagous mites (Acari) are agricultural pests that cause productivity and economic losses. Mite infestation is stressful for plants, hindering the development and harming photosynthetic structures and storage organs. In order to combat such damage, plants utilize molecular and physiological modifications, as well as the production of mite-inhib...
Article
In the state of Rio Grande do Sul, Brazil, yerba mate (Ilex paraguariensis A. St.-Hil.) is an economically and culturally important species. Because of the difficulty in obtaining plantlets from seeds, micropropagation has emerged as an alternative that could increase production. This work aimed to evaluate the effect that treatment with 6-benzylad...
Article
Full-text available
The ability of roots to obtain micronutrients from the soil and to deliver these to the aerial tissues—including seeds—is essen-tial to ensure that the shoot has the resources it needs to function effectively. However, plants need to control several steps during the journey from soil to seed, including uptake, transport, remo-bilization and storage...
Article
Full-text available
Background Strawberry is a pseudofruit mainly cultivated in temperate climate regions. Considering its high levels of ascorbic acid and phenolic compounds, the consumption of strawberry fruit can be beneficial to health. The Brazilian strawberry production revolves around 3000 tons per year, significantly influencing the food market and generating...
Article
Full-text available
Rice is a staple food for at least 50% of the world's population. Therefore, it is one of the most important crop plants on Earth (Lucca et al., 2002). However, milled rice is a poor source of essential micronutrients such as Fe and Zn (Bouis and Welch, 2010), whose deficiencies affect over three billion people worldwide, mostly in developing count...
Article
Rice is a staple food for half of the human population. Unlike other cereals such as wheat and barley, rice plants are susceptible to cold stress, which often results in decreased productivity, especially in regions where the indica subspecies is cultivated. Low temperatures can have negative impacts on rice plants during germination, vegetative gr...
Article
Senescence is a coordinated process where a plant, or a part of it, engages in programmed cell death to salvage nutrients by remobilizing them to younger tissues or to developing seeds. As Fe and Zn deficiency are the two major nutritional disorders in humans, increased concentration of these nutrients through biofortification in cereal grains is a...
Article
Full-text available
Zinc (Zn) is an essential micronutrient for plants, playing catalytic or structural roles in enzymes, transcription factors, ribosomes, and membranes. In humans, Zn deficiency is the second most common mineral nutritional disorder, affecting around 30% of the world's population. People living in poverty usually have diets based on milled cereals, w...