Abstract
The availability of reduced nitrogen is the most limiting factor in plant growth. In legume plants, nitrogen is provided by symbiotic bacteria (Rhizobium spp.) in exchange for carbon supplied by the host as photosynthates. A significant portion (25 to 30%) of the carbon received by nodules from photosynthates is returned to the shoot as nitrogenous solutes. Thus, not only are large amounts of energy required to support nitrogen fixation, but assimilation of that nitrogen is also energy intensive. It has been suggested that C02 fixation in the dark, catalyzed by phosphoenolpyruvate (PEP) carboxylase, can function as an anapleurotic pathway to supply part of the carbon skeleton needed for nitrogen assimilation.1 Legumes of temperate regions generally assimilate and export fixed nitrogen as amides, while the tropical legumes, e. g., soybean, synthesize ureides (allantoin and allantoic acid) that account for > 90% of the nitrogen in their xylem sap.2 Extensive studies have been carried out to calculate the carbon/nitrogen budget of several legumes, but our knowledge of the regulatory mechanisms controlling the expression of genes involved in carbon and nitrogen pathways in nodules is very limited. Moreover, we do not know how the regulation of these genes is affected by the supply of carbon and nitrogen and different levels of oxygen present in infected and uninfected cells of the nodules.
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© 1989 Plenum Press, New York
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Verma, D.P.S. (1989). Plant Genes Involved in Carbon and Nitrogen Assimilation in Root Nodules. In: Poulton, J.E., Romeo, J.T., Conn, E.E. (eds) Plant Nitrogen Metabolism. Recent Advances in Phytochemistry, vol 23. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-0835-5_2
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DOI: https://doi.org/10.1007/978-1-4613-0835-5_2
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