The aim of this work was to investigate whether sucrose synthesis in the cytosol of leaf cells is regulated in response to the supply of energy and organic carbon from the chloroplast. Fluxes into sucrose and metabolite levels in wheat (Triticum aestivum var Timmo) leaf protoplasts were compared in a range of light intensities and CO2 concentrations, showing that sucrose-phosphate synthase and ...

Nitrogen availability directly affects the microalgal metabolism. A thermophilic cyanobacterium named Thermosynechococcus CL-1 was cultivated in a continuous system to evaluate the effects of NO3 fluxes on the biomass production, bioenergy production, and CO2 fixation. The results show that decreasing the NO3 flux to a N-deprived level (1.01 mM/d) enhances the carbohydrate content in TCL-1 to 4...

A sulfur-oxidizing chemolithoautotrophic bacterium, Sulfurovum lithotrophicum 42BKTT, isolated from hydrothermal sediments in Okinawa, Japan, has been used industrially for CO2 bio-mitigation owing to its ability to convert CO2 into C5H8NO4- at a high rate of specific mitigation (0.42 g CO2/cell/h). The genome of S. lithotrophicum 42BKTT comprised of a single chromosome of 2217,891 bp with 2217...

Nitrogen-fixing activity declines first rapidly and then more gradually when Anabaenopsis circularis is transferred from light into dark conditions. The rate and duration of dark acetylene reduction (nitrogen fixation) depend upon conditions prevailing during the preceding light period. Factors (such as light intensity, CO2 concentration, and supply of glucose), which in the light affect photos...

Estimating the additional amount of global photosynthetic arbon influx into terrestrial ecosystems (PG) becomes possible with a leaf-level factor (Y) developed by Luo & Mooney only when an increase in atmospheric CO2 concentration (Ca) is small. Applying the Y factor to study long-term stimulation of PG with a large increase in Ca needs understanding of adjustments in leaf properties, canopy st...

Increased root exudation and a related stimulation of rhizosphere-microbial growth have been hypothesised as possible explanations for a lower nitrogen(N-) nutritional status of plants grown under elevated atmospheric CO2 concentrations, due to enhanced plantmicrobial N competition in the rhizosphere. Leguminous plants may be able to counterbalance the enhanced N requirement by increased symbio...

Phytoplankton in high-light, low-nutrient ocean environments are challenged with maintaining high photosynthetic efficiency and simultaneously preventing photodamage that results from low levels of electron acceptors downstream of photosystem II (PSII). Here, we identify a process in open ocean picophytoplankton that preserves PSII activity by diverting electrons from the photosystem I (PSI) co...