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Marco Antonio Oliva

Bio: Marco Antonio Oliva is an academic researcher from Universidade Federal de Viçosa. The author has contributed to research in topics: Stomatal conductance & Photosynthesis. The author has an hindex of 28, co-authored 83 publications receiving 3862 citations.


Papers
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Journal ArticleDOI
TL;DR: In this article, the effects of NaCl stress on the activity of antioxidant enzymes such as superoxide dismutase (SOD: EC 1.15.1), peroxidase (POD:EC 1.11.7), and glutathione reductase (GR: EC1.6.4) were investigated in two cotton cultivars, Guazuncho and Pora, grown in nutrient solution.

1,085 citations

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TL;DR: It is suggested that the reduction in shoot development and leaf elongation were related to toxic ion accumulation and depletion of K+ ions in the leaf blades and the accumulation of organic solutes in leaves did not appear to be related to salt tolerance.

422 citations

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TL;DR: In this paper, Physiological responses to salt stress were investigated in two cotton (Gossypium hirsutum L.) cultivars (Pora and Guazuncho) grown hydroponically under various concentrations of NaCl.
Abstract: Physiological responses to salt stress were investigated in two cotton (Gossypium hirsutum L.) cultivars (Pora and Guazuncho) grown hydroponically under various concentrations of NaCl. Dry matter partitioning, plant water relations, mineral composition and proline content were studied. Proline and inorganic solutes were measured to determine their relative contribution to osmotic adjustment. Both leaf water potential (Ψw) and osmotic potential (Ψs)decreased in response to NaCl levels. Although Ψwand Ψs decreased during salt stress, pressure potential Ψp remained between 0.5 to 0.7 MPa in control and all NaCl treatments, even under 200 mol m−3 NaCl. Increased NaCl levels resulted in a significant decrease in root, shoot and leaf growth biomass. Root / shoot ratio increased in response to salt stress. The responses of both cultivars to NaCl stress were similar. Increasing salinity levels increased plant Na+ and Cl−. Potassium level remained stable in the leaves and decreased in the roots with increasing sal...

258 citations

Journal ArticleDOI
TL;DR: In this article, the effects of salinity on some growth and physiological parameters in algarrobo seedlings were investigated, and the results suggest that glycinebetaine enhancement may be important for osmotic adjustment in prosopis alba under salinity stress.
Abstract: Prosopis alba (algarrobo) is one of the most important salt-tolerant legumes used in the food and furniture industries. The effects of salinity on some growth and physiological parameters in algarrrobo seedlings were investigated. 17-Day-old seedlings were subjected to three salt treatments by adding NaCl to the growth medium in 50 mmol.L-1 increments every 24 h until the final concentrations of 0, 300 and 600 mmol.L-1 were reached. Only the highest NaCl concentration affected all of the considered parameters. Thus, 600 mmol.L-1 NaCl caused a significant reduction in root and shoot growth, but an increase in the root/shoot ratio. Leaf relative water content, nitrate content and nitrate reductase activity in leaves and roots were also decreased. At 300 and 600 mmol.L-1, the glycinebetaine content was significantly increased in both leaves and roots but this was not found for proline content. Total soluble carbohydrates increased only in roots. The results suggest that glycinebetaine enhancement may be important for osmotic adjustment in Prosopis alba under salinity stress.

237 citations

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TL;DR: High correlation between SOD activity and the F(v)/F(m )ratio under both PEG induced water stress and MV-mediated oxidative stress was observed, suggesting that SOD can protect PSII from superoxide generated by oxidative and water stress.

217 citations


Cited by
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Journal ArticleDOI
TL;DR: In this review article, numerous examples of successful application of these compounds to improve plant stress tolerance are presented and a better understanding of the mechanisms of action of exogenously applied GB and proline is expected to aid their effective utilization in crop production in stress environments.

3,847 citations

Journal ArticleDOI
TL;DR: The ability of plants to tolerate salt is determined by multiple biochemical pathways that facilitate retention and/or acquisition of water, protect chloroplast functions, and maintain ion homeostasis as mentioned in this paper.

3,546 citations

Journal ArticleDOI
TL;DR: The surface properties of ENPs are of essential importance for their aggregation behavior, and thus for their mobility in aquatic and terrestrial systems and for their interactions with algae, plants and, fungi as mentioned in this paper.
Abstract: Developments in nanotechnology are leading to a rapid proliferation of new materials that are likely to become a source of engineered nanoparticles (ENPs) to the environment, where their possible ecotoxicological impacts remain unknown. The surface properties of ENPs are of essential importance for their aggregation behavior, and thus for their mobility in aquatic and terrestrial systems and for their interactions with algae, plants and, fungi. Interactions of ENPs with natural organic matter have to be considered as well, as those will alter the ENPs aggregation behavior in surface waters or in soils. Cells of plants, algae, and fungi possess cell walls that constitute a primary site for interaction and a barrier for the entrance of ENPs. Mechanisms allowing ENPs to pass through cell walls and membranes are as yet poorly understood. Inside cells, ENPs might directly provoke alterations of membranes and other cell structures and molecules, as well as protective mechanisms. Indirect effects of ENPs depend on their chemical and physical properties and may include physical restraints (clogging effects), solubilization of toxic ENP compounds, or production of reactive oxygen species. Many questions regarding the bioavailability of ENPs, their uptake by algae, plants, and fungi and the toxicity mechanisms remain to be elucidated.

1,548 citations

Journal ArticleDOI
TL;DR: The delivery of nanoparticulate materials to plants and their ultimate effects are reviewed to provide some insights for the safe use of this novel technology for the improvement of crops.

1,204 citations

Journal ArticleDOI
TL;DR: In this article, the effects of NaCl stress on the activity of antioxidant enzymes such as superoxide dismutase (SOD: EC 1.15.1), peroxidase (POD:EC 1.11.7), and glutathione reductase (GR: EC1.6.4) were investigated in two cotton cultivars, Guazuncho and Pora, grown in nutrient solution.

1,085 citations