A5019315600- Plant Water Relations and Carbon Dynamics
- Coffee research and impacts
- Plant responses to elevated CO2
- Growth and nutrition in plants
- Plant Stress Responses and Tolerance
- Photosynthetic Processes and Mechanisms
- Aluminum toxicity and tolerance in plants and animals
- Silicon Effects in Agriculture
- Horticultural and Viticultural Research
- Leaf Properties and Growth Measurement
- Plant responses to water stress
- Agricultural and Food Sciences
- Light effects on plants
- Nematode management and characterization studies
- Geochemistry and Elemental Analysis
- Tree-ring climate responses
- Irrigation Practices and Water Management
- Plant Physiology and Cultivation Studies
- Greenhouse Technology and Climate Control
- Plant nutrient uptake and metabolism
- Plant-Microbe Interactions and Immunity
- Plant Parasitism and Resistance
- Plant Micronutrient Interactions and Effects
- Cocoa and Sweet Potato Agronomy
- Plant pathogens and resistance mechanisms
Universidade Federal de Viçosa
2015-2025
Pennsylvania State University
2025
National Council for Scientific and Technological Development
2024
Instituto da Conservação da Natureza e das Florestas
2023
Centro Hospitalar Lisboa Norte
2016-2022
University of Lisbon
2016
University of Tasmania
2014-2015
Significance A major determinant of plant species distribution on Earth is a specific tolerance to soil drying, yet there are currently no functional or anatomical characteristics that can predict species’ requirement for rainfall. This study examines the systems responsible controlling water delivery and loss in leaves conifers finds evidence how have evolved drying climates over course last 150 million years. Two “strategies” conserving during stress emerged. One group relied hormone...
Summary Silicon (Si) is not considered to be an essential element for higher plants and believed have no effect on primary metabolism in unstressed plants. In rice ( O ryza sativa ), Si nutrition improves grain production; however, attempt has been made elucidate the physiological mechanisms underlying such responses. Here, we assessed crop yield combined advanced gas exchange analysis with carbon isotope labelling metabolic profiling measure effects of photosynthesis, together associated...
Over the last decades, most information on mechanisms underlying tolerance to drought has been gained by considering this stress as a single event that happens just once in life of plant, contrast what occurs under natural conditions where recurrent episodes are rule. Here we explored coffee (Coffea canephora) plants from broader perspective, integrating key aspects plant physiology and biochemistry. We show exposed multiple events displayed higher photosynthetic rates, which were largely...
It has long been held that the low photosynthetic rates (A) of coffee leaves are largely associated with diffusive constraints to photosynthesis. However, relative limitations stomata and mesophyll overall diffusional photosynthesis, as well coordination leaf hydraulics limitations, remain be fully elucidated in coffee. Whether actual A under ambient CO2 concentrations is kinetic properties Rubisco high (photo)respiration also remains elusive. Here, we provide a holistic analysis understand...
Worldwide measurements of nearly 130 C3 species covering all major plant functional types are analysed in conjunction with model simulations to determine the effects mesophyll conductance (g(m)) on photosynthetic parameters and their relationships estimated from A/Ci curves. We find that an assumption infinite g(m) results up 75% underestimation for maximum carboxylation rate V(cmax), 60% electron transport J(max), 40% triose phosphate utilization T(u) . V(cmax) is most sensitive, J(max)...
Silicon (Si) plays important roles in alleviating various abiotic stresses. In rice (Oryza sativa), arsenic (As) is believed to share the Si transport pathway for entry into roots, and has been demonstrated decrease As concentrations. However, physiological mechanisms through which might alleviate toxicity plants remain poorly elucidated. We combined detailed gas exchange measurements with chlorophyll fluorescence analysis examine effects of nutrition on photosynthetic performance [a...
Abstract Woody plants minimize xylem embolism formation during drought essentially by closing stomata at higher water potentials and/or increasing the resistance to embolism. Both of these mechanisms result in a stomatal safety margin (SSM), which is potential difference between closure and formation. Here, we investigated whether SSM represents mechanism for herbaceous how different water‐use strategies impact their survival. For that, exposed four crops with contrasting severe deficit...
Based on indirect evidence, it was previously suggested that shading could attenuate the negative impacts of drought coffee (Coffea arabica), a tropical crop species native to shady environments. A variety (47) morphological and physiological traits were examined in plants grown 30-l pots either full sunlight or 85% shade for 8 months, after which 4-month water shortage implemented. Overall, showed weak negligible responses light × interaction, explaining less than 10% total data variation....
• Perturbations of the source–sink balances were performed in field-grown coffee (Coffea arabica) trees to investigate possible role carbohydrates feedback regulation photosynthesis. Four treatments applied at whole-plant level: (i) complete defruiting and maintenance full leaf area, (ii) half crop load (iii) area (iv) area. Sampling measurements twice during phase dry matter accumulation fruits. Gas exchange, chlorophyll a fluorescence, carbon isotope labelling steady-state metabolite...
Coffee (Coffea spp.), a globally traded commodity, is slow-growing tropical tree species that displays an improved photosynthetic performance when grown under elevated atmospheric CO2 concentrations ([CO2]). To investigate the mechanisms underlying this response, two commercial coffee cultivars (Catuaí and Obatã) were using first free-air enrichment (FACE) facility in Latin America. Measurements conducted contrasting growth seasons, which characterized by high (February) low (August) sink...
Considering the economic importance of anthracnose, caused by Colletotrichum sublineolum, and silicon (Si) to enhance sorghum resistance against this disease, study aimed investigate effect element on leaf gas exchange also antioxidative system when infected C. sublineolum. Plants from line CMSXS142 (BR 009 [Tx623] – Texas), growing in hydroponic culture with (+Si, 2 mM) or without (–Si) Si, were inoculated Disease severity was assessed at 2, 4, 6, 8, 10 days after inoculation (dai) data...
Stomata control the exchange of CO2 and water vapor in land plants. Thus, whereas a constant supply is required to maintain adequate rates photosynthesis, accompanying losses must be tightly regulated prevent dehydration undesired metabolic changes. Accordingly, uptake or release ions metabolites from guard cells necessary achieve normal stomatal function. The AtQUAC1, an R-type anion channel responsible for malate cells, essential efficient closure. Here, we demonstrate that mutant plants...
Stomatal responsiveness to vapour pressure deficit (VPD) results in continuous regulation of daytime gas-exchange directly influencing leaf water status and carbon gain. Current models can reasonably predict steady-state stomatal conductance (gs ) changes VPD but the gs dynamics between steady-states are poorly known. Here, we used a diverse sample conifers ferns show that hydraulic architecture, particular capacitance, has major role determining response time perturbations VPD. By using...
Blast, caused by Pyricularia oryzae, has become an economically important disease in wheat Brazil, but little effort been devoted to understanding the wheat-P. oryzae interaction. This study was intended determine effects of P. infection on photosynthetic process plants using a susceptible (BR 18) and partially resistant cultivar (BRS 229). It found that net carbon assimilation rate (A), stomatal conductance (gs), transpiration were dramatically reduced both cultivars due lesser degree BRS...
Mesophyll conductance (gm) can markedly limit photosynthetic CO2 assimilation and is required to estimate the parameters of Farquhar–von Caemmerer–Berry (FvCB) model properly. The variable J (electron transport rate) most frequently used method for estimating gm, correct determination one its requirements. Recent evidence has shown that calibrating lead some errors in but what extent parameterization FvCB affected by calibrations not well known. In addition determining parameters, variants...
Drought resistance is essential for plant production under water-limiting environments. Abscisic acid (ABA) plays a critical role in stomata but its impact on hydraulic function beyond the far less studied. We selected genotypes differing their ability to accumulate ABA investigate drought-induced dysfunction. All exhibited similar leaf and stem embolism regardless of differences levels. Their was also similar. Differences were only observed between two extreme genotypes: sitiens (sit;...
Coffee (Coffea arabica L.) has been traditionally considered as shade-demanding, although it performs well without shade and even out-yields shaded coffee. Here we investigated how coffee plants adjust their metabolic machinery to varying light supply whether these adjustments are supported by a reprogramming of the primary secondary metabolism. We demonstrate that able its high conditions through marked increases in antioxidant capacity associated with enhanced consumption reducing...
In this study, the combined effects of light and water availability on functional relationships relative growth rate (RGR), leaf chemical composition, construction maintenance costs, benefits in terms payback time for Coffea arabica are presented.Coffee plants were grown 8 months 100% or 15% full sunlight then a four-month shortage was implemented.Plants under also transferred to shade vice versa.Overall, most traits assessed much more responsive than supply.Larger costs (12%), primarily...