Functional significance of dauciform roots: exudation of carboxylates and acid phosphatase under phosphorus deficiency in Caustis blakei (Cyperaceae)

The New Phytologist
Cameron W S PlaystedHans Lambers

Abstract

Caustis blakei produces an intriguing morphological adaptation by inducing dauciform roots in response to phosphorus (P) deficiency. We tested the hypothesis that these hairy, swollen lateral roots play a similar role to cluster roots in the exudation of organic chelators and ectoenzymes known to aid the chemical mobilization of sparingly available soil nutrients, such as P. Dauciform-root development and exudate composition (carboxylates and acid phosphatase activity) were analysed in C. blakei plants grown in nutrient solution under P-starved conditions. The distribution of dauciform roots in the field was determined in relation to soil profile depth and matrix. The percentage of dauciform roots of the entire root mass was greatest at the lowest P concentration ([P]) in solution, and was suppressed with increasing solution [P], while in the field dauciform roots were predominantely located in the upper soil horizons, and decreased with increasing soil depth. Citrate was the major carboxylate released in an exudative burst from mature dauciform roots, which also produced elevated levels of acid phosphatase activity. Malonate was the dominant internal carboxylate present, with the highest concentration in young dauciform roots....Continue Reading

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Citations

Jan 16, 2010·Journal of Chemical Ecology·Jeffrey D Weidenhamer, Ragan M Callaway
Sep 21, 2010·Trends in Plant Science·Griet Den HerderIve De Smet
Nov 22, 2008·Plant, Cell & Environment·Kerry L MetlenRagan M Callaway
Apr 29, 2015·Current Opinion in Plant Biology·Hans LambersMichael Renton
May 15, 2013·Molecular Biology Reports·Hai-Jian LinGuang-Tang Pan

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