Pilar Lorenzo
Central University of Venezuela
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Publication
Featured researches published by Pilar Lorenzo.
Journal of the Science of Food and Agriculture | 2015
Vanessa Cardeñosa; Evangelina Medrano; Pilar Lorenzo; María Cruz Sánchez-Guerrero; Francisco Julián Cuevas; Inmaculada Pradas; José Manuel Moreno-Rojas
BACKGROUND Different nitrogen inputs and/or development under adverse water conditions (water stress/low quality and/or high salinity/electrical conductivity), such as those prevailing in Almeria (Mediterranean coast, south-east Spain), may affect overall fruit and vegetable quality. This study evaluated the influence of salinity and nitrogen reduction in hydroponic nutrient solution on strawberry fruit quality and nutritional compounds (Fragaria × ananassa Duch., cv. Primoris). RESULTS Strawberries obtained under salinity treatments recorded the highest values for soluble solids content (SSC; all samplings); fruit taste was thus enhanced. Additionally, salinity improved fruit nutritional value, with higher contents of antioxidants compounds (first sampling). During first and second samplings, strawberries grown under N reduction and non-saline conditions showed higher values for firmness compared to fruits developed under other treatments. Regarding health-related compounds, few differences were found except for total polyphenols concentration and antioxidant activity for the first sampling, where strawberries grown under saline treatments obtained the highest values for both parameters. CONCLUSION The use of low-quality waters, such as those found in Almeria (salinity, N9S and N5S) and low nitrogen inputs (N5, avoid environmental impact) for strawberry cultivation does not exert a negative impact on overall quality. Positive differences could be found in SSC, firmness and health-related compounds when compared against the control treatment (N9).
Journal of Agricultural and Food Chemistry | 2017
María Carmen Piñero; Ginés Otálora; Manuel E. Porras; Mari C. Sánchez-Guerrero; Pilar Lorenzo; Evangelina Medrano; Francisco M. del Amor
We investigated the effect of supplying nitrogen, as NO3- or as NO3-/NH4+, on the composition of fruits of sweet pepper (Capsicum annuum L. cv. Melchor) plants grown with different CO2 concentrations ([CO2]): ambient or elevated (800 μmol mol-1). The results show that the application of NH4+ and high [CO2] affected the chroma related to the concentrations of chlorophylls. The concentrations of Ca, Cu, Mg, P, and Zn were significantly reduced in the fruits of plants nourished with NH4+, the loss of Fe being more dramatic at increased [CO2], which was also the case with the protein concentration. The concentration of total phenolics was increased by NH4+, being unaffected by [CO2]. Globally, the NH4+ was the main factor that affected fruit free amino acid concentrations. Polyamines were affected differently: putrescine was increased by elevated [CO2], while the response of cadaverine depended on the form of N supplied.
Functional Plant Biology | 2017
Manuel E. Porras; Pilar Lorenzo; Evangelina Medrano; María J. Sánchez-González; Ginés Otálora-Alcón; María Carmen Piñero; Francisco M. del Amor; M. Cruz Sánchez-Guerrero
In many plant species, long-term exposure to elevated CO2 concentration results in a reduction in photosynthetic capacity, known as acclimation. This process is mainly explained by a feedback inhibition mechanism. The supply of a fraction of the nitrogen (N) in the nutrient solution as NH4+ can play an important role in the maintenance of photosynthetic activity and could mitigate the acclimation process. The aims of the present work were to study the photosynthetic response of sweet pepper (Capsicum annuum L.) to CO2 enrichment in Mediterranean greenhouse conditions, throughout the crop growth cycle and to evaluate the supply of NH4+ in the nutrient solution as a strategy to enhance the long-term response to CO2 at different levels of salinity. The experiment was conducted in two identical greenhouses: one with CO2 enrichment according to the ventilation, maintaining a high concentration when the vents were closed and a near-atmospheric level when the vents were open and one without. Sweet pepper plants were grown in both greenhouses, being irrigated with two levels of water salinity and two N sources: (i) NO3- and (ii) NO3- plus NH4+. A reduction in the response of photosynthesis to high CO2 concentration was found in the enriched plants after 135 days of CO2 supply, with respect to the reference plants. The leaf photosynthesis rate measured at high CO2 concentration showed a closer relationship with the leaf N concentration than the non-structural carbohydrate concentration. The relative yield gain of the CO2-enriched plants progressively decreased after reaching a maximum value; this was probably associated with the photosynthetic acclimation process. This decrease was delayed by the use of NH4+ in the nutrient solution at low salinity. Knowledge of the crop phase when acclimation to high CO2 concentration occurs can be the basis for deciding when to impose an early cessation of CO2 application, as a strategy to improve the economic efficiency of CO2 supply in Mediterranean conditions.
Acta Horticulturae | 2008
Evangelina Medrano; F.J. Alonso; Ma. Cruz Sánchez-Guerrero; Pilar Lorenzo
Journal of the Science of Food and Agriculture | 1985
Juscelino Tovar; Pilar Lorenzo; Dinah S. Seidl
Journal of the Science of Food and Agriculture | 1989
Pilar Lorenzo; Juscelino Tovar; Elena Pinelli; Dinah S. Seidl
Scientia Horticulturae | 2015
María J. Sánchez-González; María Cruz Sánchez-Guerrero; Evangelina Medrano; Manuel E. Porras; Esteban J. Baeza; Pilar Lorenzo
Acta Horticulturae | 2017
María J. Sánchez-González; Pilar Lorenzo; M.C. Sánchez-Guerrero; M.E. Porras; M. Torrecillas; E.J. Baeza; M. del Río-Celestino; Evangelina Medrano
Spanish Journal of Agricultural Research | 2016
María J. Sánchez-González; María Cruz Sánchez-Guerrero; Evangelina Medrano; Manuel E. Porras; Esteban J. Baeza; Pilar Lorenzo
Scientia Horticulturae | 2016
María J. Sánchez-González; R.E. Schouten; L.M.M. Tijskens; M. Cruz Sánchez-Guerrero; Evangelina Medrano; Mercedes Del Río-Celestino; Pilar Lorenzo