Why does the musketeer approach to phosphorus acquisition from sparingly soluble forms fail: All for one, but not one for all?
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In soils where “plant-available phosphorus (P)” exists in very low concentrations because of a high capacity of P sorption, plants require specialised mechanisms to make sparingly soluble forms of P available for plant uptake. In this issue, Wang et al. (2011) used an isotopic dilution technique to confirm that cotton (Gossypium hirsutum L.) is relatively inefficient in acquiring P from sparingly soluble forms compared to wheat (Triticum aestivum L.) and white lupin (Lupinus albus L.). This followed a previous pot study where AlPO4, FePO4 and hydroxyapatite were found to be unavailable to cotton (Wang et al. 2010). Previously, field pea (Pisum sativum L.) and chickpea (Cicer arietinum L.) were found to be incapable of acquiring P from both AlPO4 and FePO4, but capable of acquiring P from hydroxyapatite [Ca5OH(PO4)3] (Pearse et al. 2007). Wang et al. (2011) have confirmed that wheat can solubilise AlPO4, and white lupin can solubilise Ca5OH(PO4)3, as found previously (Pearse et al. 2006...
KeywordsSoluble Form Root Length Density White Lupin Cluster Root FePO4
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- Wang X, Guppy CN, Watson L, Sale PWG, Tang C (2011) Availability of sparingly soluble phosphorus sources to cotton (Gossypium hirsutum L.), wheat (Triticum aestivum L.) and white lupin (Lupinus albus L.) with different forms of nitrogen as evaluated by a 32P isotopic dilution technique. Plant Soil doi: 10.1007/s11104-011-0901-0