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Perakis and Pett-Ridge (1) recently reported in PNAS that N2-fixing red alder ( Alnus rubra ) trees obtain significantly more rock-derived strontium than 5 codominant nonfixing trees in a mixed temperate rainforest in the Oregon Coast Range. The authors ascribe this to the fact that excess fixed N generates acidity, accelerating leaching of rock-derived nutrients. However, what the authors do not point out is that Alnus spp. produce cluster roots (2). In fact, actinorhizal species in different families produce cluster roots, and we are unaware of any actinorhizal species that does not produce cluster roots (3).Cluster roots mobilize poorly available phosphorus and other elements because they release large amounts of carboxylates (3). Functionally equivalent but morphologically very different specialized roots occur in, for example, Cactaceae (4), Cyperaceae (5), and Velloziaceae (6). Carboxylate-releasing cluster roots in … [↵][1]1To whom correspondence may be addressed. Email: hans.lambers{at}uwa.edu.au. [1]: #xref-corresp-1-1

Do cluster roots of red alder play a role in nutrient acquisition from bedrock?