Abstract
In higher plants, recent advances in plant molecular biotechnology combined with modern physiological and biochemical studies have expanded our understanding of the regulatory mechanisms controlling the primary steps of inorganic nitrogen assimilation and the subsequent biochemical pathways involved (Fig. 1). Nitrate is the principal nitrogen source for most crops. The uptake and reduction of nitrate to ammonia is discussed in detail in Chapter 1.1. In this Chapter, the term ammonia will be used to indicate ammonia and ammonium ions, which are present in equilibrium in solution. In addition to nitrate reduction, ammonia is produced in plant tissues through a variety of processes as well as being taken up directly from the soil (Chap. 2.1). For example, ammonia is generated through the fixation of atmospheric nitrogen by root nodules (Chap. 3.1), by photorespiring leaves and through the phenylpropanoid pathway. Ammonia may also be released for reassimilation by sink tissue from nitrogen transport compounds (e.g. asparagine, arginine and the ureides) and through breakdown of other nitrogenous compounds (Lea et al. 1990; Woodall et al. 1996).
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Hirel, B., Lea, P.J. (2001). Ammonia Assimilation. In: Lea, P.J., Morot-Gaudry, JF. (eds) Plant Nitrogen. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-04064-5_4
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