BMC Plant Biology, ( ISI ), Volume (11), No (121), Year (2011-8) , Pages (1-8)

Title : ( Citramalic acid and salicylic acid in sugar beet root exudates solubilize soil phosphorus )

Authors: Reza Khorassani , Ursula Hettwer , Astrid Ratzinger , Bernd Steingrobe , Petr Karlovsky , Norbert Claassen ,

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Background: In soils with a low phosphorus (P) supply, sugar beet is known to intake more P than other species such as maize, wheat, or groundnut. We hypothesized that organic compounds exuded by sugar beet roots solubilize soil P and that this exudation is stimulated by P starvation. Results: Root exudates were collected from plants grown in hydroponics under low- and high-P availability. Exudate components were separated by HPLC, ionized by electrospray, and detected by mass spectrometry in the range of mass-to-charge ratio (m/z) from 100 to 1000. Eight mass spectrometric signals were enhanced at least 5-fold by low P availability at all harvest times. Among these signals, negative ions with an m/z of 137 and 147 were shown to originate from salicylic acid and citramalic acid. The ability of both compounds to mobilize soil P was demonstrated by incubation of pure substances with Oxisol soil fertilized with calcium phosphate. Conclusions: Root exudates of sugar beet contain salicylic acid and citramalic acid, the latter of which has rarely been detected in plants so far. Both metabolites solubilize soil P and their exudation by roots is stimulated by P deficiency. These results provide the first assignment of a biological function to citramalic acid of plant origin.

Keywords

, Citramalic acid, Salisylic acid, Soil P, Root
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@article{paperid:1023522,
author = {Khorassani, Reza and Ursula Hettwer and Astrid Ratzinger and Bernd Steingrobe and Petr Karlovsky and Norbert Claassen},
title = {Citramalic acid and salicylic acid in sugar beet root exudates solubilize soil phosphorus},
journal = {BMC Plant Biology},
year = {2011},
volume = {11},
number = {121},
month = {August},
issn = {1471-2229},
pages = {1--8},
numpages = {7},
keywords = {Citramalic acid; Salisylic acid; Soil P; Root exudates},
}

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%0 Journal Article
%T Citramalic acid and salicylic acid in sugar beet root exudates solubilize soil phosphorus
%A Khorassani, Reza
%A Ursula Hettwer
%A Astrid Ratzinger
%A Bernd Steingrobe
%A Petr Karlovsky
%A Norbert Claassen
%J BMC Plant Biology
%@ 1471-2229
%D 2011

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