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Energy and the Human Journey: Where We Have Been; …

Canadian Journal of Fisheries and Aquatic The role of iron in phytoplankton photosynthesis The role of iron nutrition in photosynthesis and nitrogen

Which definition, what one?: Which of these do you want? Which do you want? See more.

In bacteria, there are two general types of phosphotransferase system (PTS): the sugar PTS, mainly involved in carbohydrate transport, and the nitrogen PTS, which exerts regulatory functions. The nitrogen PTS consists of enzyme I (EINtr), histidine protein (NPr), and enzyme IIA (EIIANtr). The active phosphate moiety derived from phosphoenolpyruvate (PEP) is transferred through EINtr and NPr to EIIANtr (Fig. 1). In S. fredii, deletion mutants of EINtr or NPr were impaired in symbiotic performance on legume hosts, while the mutant without EIIANtr could still establish effective nitrogen-fixing nodules (Fig 1). However, the further deletion of EIIANtr in the mutants lacking EINtr or NPr could relieve the nitrogen starvation phenotype of legume plants inoculated with corresponding mutants (Fig 1). These findings suggest a negative regulation role of unphosphorylated EIIANtr in symbiosis.

Carbon Dioxide in the Ocean and Atmosphere - sea, …

The role of iron nutrition in photosynthesis and nitrogen Iron plays a crucial role in the Iron limitation of phytoplankton in an urbanized

The photosynthetic performance of indica rice (eight varieties) leaves at varying nitrogen supply levels in solution culture and possible role of ribulose-1, 5-bisphosphate carboxylase/oxygenase (Rubisco) in regulating photosynthesis were studied. In all the varieties studied, a linear correlation was observed between the oxygen evolution rate (OER) and Rubisco amounts less than 2g m-2. The OER tended to become saturated at Rubisco levels higher than 2 g m-2. Among the traditional and improved varieties, Pokkali, Baisbish and IR 442-2-58 showed a high OER/Rubisco ratio. Based on our regression fitting, the rice varieties were classified into high or low Rubisco efficiency group.

iron homeostasis in marine phytoplankton involved in photosynthesis and plays a central role in the diel regulation of iron uptake and recycling

NPC Quietnet: CQS - Leaf Blower Facts

Phytoplankton interactions with iron The role of iron nutrition in photosynthesis and nitrogen assimilation ..

Phytoplankton interactions with iron The role of iron nutrition in photosynthesis and nitrogen assimilation in Scenedesmus quadicauda Chlorophyceae J

The overuse of chemical nitrogen fertilizer in agriculture has caused serious environmental issues around the world. Legume crops play important roles in sustainable agriculture and are characterized by their ability of forming nitrogen-fixing nodules, in which rhizobia infect intracellularly and atmospheric nitrogen is reduced to ammonium in specialized rhizobial cells (bacteroids). In addition to those genes directly involved in nodulation and nitrogen fixation, to achieve effective nitrogen-fixing symbiosis, rhizobia need to fine-tune their background regulation network. For example, genetic evidences from this laboratory suggest that a conserved nitrogen phosphotransferase system is essential in Sinorhizobium fredii symbioses with soybean and pigeonpea.

Eutrophication: impacts of excess nutrient inputs on freshwater, marine, and terrestrial ecosystems
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