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000056266 084__ $$2WoS$$aAgronomy
000056266 084__ $$2WoS$$aPlant Sciences
000056266 084__ $$2WoS$$aSoil Science
000056266 1001_ $$0P:(DE-HGF)0$$aShane, M. W.$$b0
000056266 245__ $$aImpact of phosphorus mineral source (Al-P or Fe-P) and pH on cluster-root formation and carboxylate exudation in Lupinus albus L.
000056266 260__ $$aDordrecht [u.a.]$$bSpringer Science + Business Media B.V$$c2008
000056266 300__ $$a169 - 178
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000056266 520__ $$aLupinus albus L. were grown in rhizoboxes containing a soil amended with sparingly available Fe-P or Al-P (100 mu g P g(-1) soil/resin mixture). Root halves of individual plants were supplied with nutrient solution (minus P) buffered at either pH 5.5 or 7.5, to assess whether the source of mineral-bound P and/or pH influence cluster-root growth and carboxylate exudation. The P-amended soil was mixed 3:1 (w/w) with anion-exchange resins to allow rapid fixation of carboxylates. Treatments lasted 10 weeks. Forty percent and 30% of the root mass developed as cluster roots in plants grown on Fe-P and Al-P respectively, but cluster-root growth was the same on root-halves grown at pH 5.5 or 7.5. Mineral-bound P source (Al- or Fe-P) had no influence on the types of carboxylates measured in soil associated with cluster roots-citrate (and trace amounts of malate and fumarate) was the only major carboxylate detected. The [citrate] in the rhizosphere of cluster roots decreased with increased shoot P status (suggesting a systemic effect) and also, only for plants grown on Al-P, with decreased pH in the root environment (suggesting a local effect). In a separate experiment using anion exchange resins pre-loaded with malate or citrate, we measured malate (50%) and citrate (79%) recovery after 30 days in soil. We therefore, also conclude that measurements of [citrate] and [malate] at the root surface may be underestimated and would be greater than the 40- and 1.6-mu mol g(-1) root DM, respectively estimated by us and others because of decomposition of carboxylates around roots prior to sampling.
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000056266 65320 $$2Author$$acitrate
000056266 65320 $$2Author$$aP-deficiency
000056266 65320 $$2Author$$aproteoid roots
000056266 65320 $$2Author$$asplit-root design
000056266 65320 $$2Author$$asystemic signal
000056266 65320 $$2Author$$awhite lupin
000056266 7001_ $$0P:(DE-HGF)0$$aLambers, H.$$b1
000056266 7001_ $$0P:(DE-HGF)0$$aGawthray, G.R.$$b2
000056266 7001_ $$0P:(DE-Juel1)129349$$aKuhn, A. J.$$b3$$uFZJ
000056266 7001_ $$0P:(DE-Juel1)129402$$aSchurr, U.$$b4$$uFZJ
000056266 773__ $$0PERI:(DE-600)1478535-3$$a10.1007/s11104-007-9535-7$$gVol. 304, p. 169 - 178$$p169 - 178$$q304<169 - 178$$tPlant and soil$$v304$$x0032-079X$$y2008
000056266 8567_ $$uhttp://dx.doi.org/10.1007/s11104-007-9535-7
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