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... The primary function of stomata is to minimize plant water loss while maintaining CO₂ assimilation. Stomatal water loss incurs an indirect cost to photosynthesis in the form of non-stomatal limitations (NSL) via reduced carboxylation capacity (CAP) and/or mesophyll conductance (MES). Two optimal formulations for stomatal conductance (gₛ) arise from the assumption of each type of NSL. In reality, b ...
... Gross primary productivity (GPP) is a vital ecosystem variable that is used as a proxy to study the functional behaviour of a terrestrial ecosystem and its ability to regulate atmospheric CO₂ by working as a carbon pool. India, having the potential terrestrial ecosystem dynamics to absorb the atmospheric carbon dioxide to some extent, is one of the least-explored regions in terms of carbon monitor ...
C3 plants; C4 plants; animals; biogeography; carbon dioxide; ecosystems; global change; grasses; grasslands; models; nitrogen; soil carbon; temperature; North America
Abstract:
... AIM: C₄ grasses are distinct from C₃ grasses, because C₄ grasses respond in a different manner to light, temperature, CO₂ and nitrogen and often have higher resource‐use efficiencies. C₃ and C₄ grasses are typically represented in earth system models (ESMs) by different plant functional types (PFTs). The ability of ESMs to capture C₄ grass biogeography and ecology across differing time periods is ...
... C₄ leaves confine Rubisco to bundle sheath cells. Thus, the size of bundle sheath compartments and the total volume of chloroplasts within them limit the space available for Rubisco. Rubisco activity limits photosynthesis at low temperatures. C₃ plants counter this limitation by increasing leaf Rubisco content, yet few C₄ species do the same. Because C₃ plants usually outperform C₄ plants in chill ...
C3 plants; C4 plants; acclimation; carbon; carbon dioxide; climate; leaves; photosynthesis; probability distribution; temperature
Abstract:
... Under future climates, leaf temperature (Tₗ) will be higher and more variable. This will affect plant carbon (C) balance because photosynthesis and respiration both respond to short‐term (subdaily) fluctuations in Tₗ and acclimate in the longer term (days to months). This study asks the question: To what extent can the potential and speed of photosynthetic acclimation buffer leaf C gain from risin ...
... Flash pyrolysis in air of the complete set of 13C1 isotopologs of D-glucose, monitored by GC/MS using an efficient column for separating the light gases, allowed us to determine the sources within D-glucose for a range of light hydrocarbons and carbon oxides. These include carbon monoxide (CO), carbon dioxide (CO2), ethyne, ethene, ethane, propadiene, propene, propane, various isomers of butene, 1 ...
Bothriochloa bladhii; C4 plants; aboveground biomass; belowground biomass; biofuels; carbon; carbon dioxide; cultivars; ecosystem respiration; eddy covariance; energy crops; evapotranspiration; field experimentation; fuel production; gross primary productivity; hydrologic cycle; introduced plants; net ecosystem exchange; perennials; prairies; seasonal variation; warm season grasses; water use efficiency; Great Plains region; Southeastern United States
Abstract:
... Old world bluestem cultivar WW-B Dahl [Bothriochloa bladhii (Retz.), S. T. Blake] is a non-native perennial C4 bunch grass with biofuel production potential grown predominantly in the Southern U.S. Great Plains. Although this is a popular introduced grass cultivar, data on carbon fluxes and evapotranspiration (ET) from this warm-season grass is rare. In this study, the eddy covariance method was u ...
C3 plants; C4 photosynthesis; C4 plants; carbon; diet; dry environmental conditions; food webs; granivores; grasses; grasslands; phytomass; rodents; soil organic matter; stable isotopes; variance; Great Plains region; United States
Abstract:
... Diet is an ecological attribute that species may adjust to cope with changing environments and may indicate how a population responds to changes in resource availability. In the Great Plains, plants utilizing the C4 photosynthetic pathway may increase in abundance in the future because of their high tolerance for warm and dry environments, which are projected to increase. How increased C4 abundanc ...
... Due to an increased interest in healthy diets, people try to replace conventionally refined sugar. Consequently, the demand for alternative sweeteners is growing. Coconut blossom sugar benefits from this trend and is conquering European grocery stores and kitchens. While sugar extraction from coconut sap has a long tradition in South and Southeast Asian, not much is known in Europe about its manuf ...
... To better understand the coordination between dark and light reactions during the transition from C₃ to C₄ photosynthesis, we optimized a method for separating thylakoids from mesophyll (MC) and bundle sheath cells (BSCs) across different plant species. We grew six Paniceae grasses including representatives from the C₃, C₃–C₄ and C₄ photosynthetic types and all three C₄ biochemical subtypes [nicot ...
... The objective of this study was to evaluate the potential of three C4 perennial grasses (Miscanthus x giganteus, Panicum virgatum and Spartina pectinata) for biomass production on arable land unsuitable for food crop cultivation due to Pb, Cd and Zn contamination. We assessed soil properties, biomass yield, metal concentrations, and the photosynthetic performance of each species. Physico-chemical ...
... BACKGROUND: C4 plants have been classified into three subtypes based on the enzymes used to decarboxylate C4 acids in the bundle sheath cells (NADP-ME, NAD-ME and PEPCK pathways). Evidences indicate that, depending on environmental factors, C4 plants may exhibit a certain degree of flexibility in the use of the decarboxylation mechanisms. In this context, the objective was to extend the knowledge ...
... Background: Abiotic microhabitat amelioration and protection from herbivores are two of the main mechanisms associated with facilitative interactions in plant communities. Aims: We investigated the effect of the shrub Acanthostyles buniifolius on the herbaceous community of a subhumid grassland in order to disentangle the protective role of the shrub from its effect on ameliorating the abiotic con ...
C3 plants; C4 plants; Cycas; aerosols; altitude; carbon; combustion; conservation areas; derivatization; emissions; forests; gas chromatography; grasses; isoprene; isotope fractionation; mass spectrometry; meteorological parameters; population distribution; shrubs; stable isotopes; summer; troposphere; China
Abstract:
... Isoprene is the most abundant non-methane hydrocarbons (NMHCs) in the troposphere and is released predominantly by vegetation. The δ13C values of atmospheric isoprene vary with different plant types (e.g. C3 and C4 plants). In this work, aerosol samples were collected in four forest areas in Sichuan Province, China, i.e., the Baima Spring Scenic Area (BM), the Panzhihua Cycas Nature Reserve (PZ), ...
... We assessed the feeding habits of the Amazonian manatee inhabiting blackwater (Negro River) and clearwater (Tapajós River) igapós (floodplains) using δ¹³C and δ¹⁵N of dentin and bone collagen from different ontogenetic classes (nursing calves, juveniles, and adults). Within an individual, the dentine δ¹³C and δ¹⁵N values did not vary with tooth position. Bones were more depleted in ¹³C and ¹⁵N com ...
... The proliferation of C4 photosynthesis in land plants marks the most important ecological shift in tropical and subtropical terrestrial ecosystems during the Cenozoic. Despite the wealth of geochemical data indicating an increased C4 biomass in the paleovegetation since the Late Miocene spatial and temporal variations of C4 plants abundance are not well known. The driving force for their expansion ...
... Land-use change for bioenergy production can release greenhouse gases (GHG) through disturbance of soil carbon (C) pools, but use of native species with extensive root systems as bioenergy crops may help mitigate GHG emissions by enhancing soil C sequestration. Here, we investigated how (1) fertilization, (2) plant species and cultivars, and (3) inter- and intra-specific diversity affect soil C an ...
... The aboveground primary production is a major source of carbon (C) and nitrogen (N) pool and plays an important role in regulating the response of ecosystem and nutrient cycling to natural and anthropogenic disturbances. To explore the mechanisms underlying the effect of spring fire and topography on the aboveground biomass (AGB) and the soil C and N pool, we conducted a field experiment between A ...
Myles Levey; Stefan Timm; Tabea Mettler-Altmann; Gian Luca Borghi; Maria Koczor; Stéphanie Arrivault; Andreas PM Weber; Hermann Bauwe; Udo Gowik; Peter Westhoff
... Photorespiration is indispensable for oxygenic photosynthesis since it detoxifies and recycles 2-phosphoglycolate (2PG), which is the primary oxygenation product of Rubisco. However, C₄ plant species typically display very low rates of photorespiration due to their efficient biochemical carbon-concentrating mechanism. Thus, the broader relevance of photorespiration in these organisms remains uncle ...
... Measurements of photosynthetic assimilation rate as a function of intercellular CO₂ (A/Cᵢ curves) are widely used to estimate photosynthetic parameters for C₃ species, yet few parameters have been reported for C₄ plants, because of a lack of estimation methods. Here, we extend the framework of widely used estimation methods for C₃ plants to build estimation tools by exclusively fitting intensive A ...