Effects of external phosphorus supply on internal phosphorus concentration and the initiation, growth and exudation of cluster roots in Hakea prostrata R.Br.

By M. W. Shane, M. de Vos, S. de Roock, G. Cawthray, H. Lambers. Plant and Soil, 2004

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Plant and microbial strategies to improve the phosphorus efficiency of agriculture (2011, background): “However, P acquisition traits may not be expressed in all cropping situations because increasing soil P availability reduces investment in cluster roots to almost zero in all species (Reddell et al. 1997; Shane et al. 2003a; Shane et al. 2003b; Shane et al. 2006; Abdolzadeh et al. 2010).”
Carboxylate release of wheat, canola and 11 grain legume species as affected by phosphorus status (2006, background): “Cluster-root development by L. albus is not necessarily a response to severe P deficiency, rather it shows a suppression response with high-P supply (Keerthisinghe et al. 1998), unlike in other Lupinus species and Proteaceae, where the formation of cluster roots is induced by severe P deficiency (Ho”
Root structure and functioning for efficient acquisition of phosphorus: Matching morphological and physiological traits. (2006, background): “First, cluster roots of H. prostrata, which naturally occurs in a Mediterranean (winter rainfall) environment, are only produced during the wet season (Lamont, 1982) and function only at very low plant P status (Shane et al., 2003).”