Cover illustration: Specialized proteoid-root clusters (left, Banksia prionotes, Proteaceae, south-western Australian) and dauciform-root clusters (right, Tetraria sp., Cyperaceae, South Africa) are underground adaptations that provide access to poorly available nutrients (e.g. phosphorus). The formation of dense clusters of rootlets (proteoid roots) or root hairs (dauciform roots) and their functioning as an integral strategy for nutrient acquisition in non-mycorrhizal species is reviewed in Lambers et al. (pp. 693–713).
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