22 documents found, page 1 of 3
Are tomato plants co-exposed to heat and salinity able to ensure a proper carbo...
Rodrigues, Francisca; Sousa, Bruno; Soares, Cristiano; Moreira, Diana; Pereira, Cláudia; Moutinho-Pereira, José; Cunha, Ana; Fidalgo, FernandaAbiotic stress combinations, such as high temperatures and soil/water salinization, severely threaten crop productivity worldwide. In this work, an integrative insight into the photosynthetic metabolism of tomato plants subjected to salt (100 mM NaCl) and/or heat (42 °C; 4 h/day) was performed. After three weeks, the stress combination led to more severe consequences on growth and photosynthetic pigments than t...
O uso da biomassa foliar de eucalipto como biocida: efeitos nas propriedades do...
Teixeira, Tiago; Cruz, Telmo; Pato, Pedro; Pinto, Mafalda; Fidalgo, Fernanda; Pereira, Ruth; Cachada, Anabela; Patinha, CarlaA área florestal portuguesa é dominada principalmente por Eucalyptus globulus e, sendo esta uma espécie invasora e muito inflamável, é importante controlar a sua proliferação. Neste sentido, o projeto PEST(bio)CIDE, assentando numa perspetiva de economia circular, pretende explorar o potencial fitotóxico das folhas do eucalipto e utilizar a sua biomassa foliar como um biocida eficaz e ambientalmente seguro. De...
Enzymatic and non-enzymatic antioxidant responses of young tomato plants (cv. m...
Machado, Joana; Vasconcelos, Marta W.; Soares, Cristiano; Fidalgo, Fernanda; Heuvelink, Ep; Carvalho, Susana M. P.This study aims to perform a broad analysis of the antioxidant (AOX) responses of young tomato plants exposed to single and combined mild nitrogen (N) and water deficits through the evaluation of oxidative biomarkers, non-enzymatic and enzymatic AOX components. ‘Micro-Tom’ seedlings were subjected to four treatments: control (CTR; 100%N + 100%W), N deficit (N; 50%N), water deficit (W; 50%W), and combined defici...
Young tomato plants respond differently under single or combined mild nitrogen ...
Machado, Joana; Vasconcelos, Marta W.; Soares, Cristiano; Fidalgo, Fernanda; Heuvelink, Ep; Carvalho, Susana M.P.This study aimed to understand the morphophysiological responses and primary metabolism of tomato seedlings subjected to mild levels of nitrogen and/or water deficit (50% N and/or 50% W). After 16 days of exposure, plants grown under the combined deficit showed similar behavior to the one found upon exposure to single N deficit. Both N deficit treatments resulted in a significantly lower dry weight, leaf area, ...
Early activation of antioxidant responses in Ni-stressed tomato cultivars deter...
Spormann, Sofia; Soares, Cristiano; Martins, Viviana; Azenha, Manuel; Gerós, H.; Fidalgo, FernandaThroughout their life cycle, plants are subjected to a variety of environmental constraints, including abiotic stresses. The present study aimed at characterizing the responses of the two tomato cultivars Gold Nugget (GN) and Purple Calabash (PC) exposed to a combination of nickel (Ni) and drought. The following hypotheses were pursued: (i) the activation of responses to one stressor eases further adjustments t...
Impact of combined heat and salt stresses on tomato plants-insights into nutrie...
Sousa, Bruno; Rodrigues, Francisca; Soares, Cristiano; Martins, Maria; Azenha, Manuel; Lino-Neto, T.; Santos, Conceicao; Cunha, Ana; Fidalgo, FernandaCurrently, salinity and heat are two critical threats to crop production and food security which are being aggravated by the global climatic instability. In this scenario, it is imperative to understand plant responses to simultaneous exposure to different stressors and the cross-talk between underlying functional mechanisms. Thus, in this study, the physiological and biochemical responses of tomato plants (Sol...
Silicon improves the redox homeostasis to alleviate glyphosate toxicity in toma...
Soares, Cristiano; Nadais, Pedro; Sousa, Bruno; Pinto, Edgar; Ferreira, Isabel M. P. V. O.; Pereira, Ruth; Fidalgo, FernandaGiven the widespread use of glyphosate (GLY), this agrochemical is becoming a source of contamination in agricultural soils, affecting non-target plants. Therefore, sustainable strategies to increase crop tolerance to GLY are needed. From this perspective and recalling silicon (Si)’s role in alleviating different abiotic stresses, the main goal of this study was to assess if the foliar application of Si, either...
Foliar application of sodium nitroprusside boosts solanum lycopersicum l. toler...
Soares, Cristiano; Rodrigues, Francisca; Sousa, Bruno; Pinto, Edgar; Ferreira, Isabel M. P. V. O.; Pereira, Ruth; Fidalgo, FernandaStrategies to minimize the effects of glyphosate (GLY), the most used herbicide worldwide, on non-target plants need to be developed. In this context, the current study was designed to evaluate the potential of nitric oxide (NO), provided as 200 µM sodium nitroprusside (SNP), to ameliorate GLY (10 mg kg−1 soil) phytotoxicity in tomato plants. Upon herbicide exposure, plant development was majorly inhibited in s...
Tolerance response of tomato plants (Solanum lycopersicum L.) to climate change...
Rodrigues, Francisca; Sousa, Bruno; Soares, Cristiano; Martins, Maria; Cunha, Ana; Fidalgo, FernandaIn the face of ongoing and projected climate change, including longer and more severe heat waves, longer periods of water shortage and the growing problem of soil salinity, the understanding of plants´ response to the combination of two abiotic stress factors that commonly occur simultaneously - salinity and heat - is a matter of special interest. Thus, in this study, the effect of the co-exposure of tomato pla...
Vineyard calcium sprays reduce the damage of postharvest grape berries by stimu...
Martins, Viviana; Soares, Cristiano; Spormann, Sofia; Fidalgo, Fernanda; Gerós, H.Calcium supplements have been increasingly used for decay prevention, sanitation and nutritional enrichment of fruits, as more environmentally friendly alternatives to fungicides. However, little is known on the effects of these supplements on grape berry biochemical and molecular properties during storage. In this study, we addressed the hypothesis that the application of calcium chloride (CaCl2) in grapevines...