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Aluminum stress stimulates the accumulation of organic acids in root apices of Brachiaria species

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Title Aluminum stress stimulates the accumulation of organic acids in root apices of Brachiaria species
 
Creator Wenzl, Peter
Chavez, Alba L.
Patiño, Gloria M.
Mayer, Jorge Edgard
Rao, Idupulapati M.
 
Subject feed crops
brachiaria decumbens
brachiaria ruziziensis
feed grasses
aluminium
organic acids
apical meristems
roots
detoxification
gramíneas forrajeras
aluminio
acidos orgánicos
meristemas apicales
raíces
desintoxicación
 
Description CIAT- Outstanding Research Publication Award (ORPA) - 2003
Aluminum‐resistant Brachiaria decumbens Stapf cv. Basilisk (signalgrass) and closely related, but less resistant Brachiaria ruziziensis Germain & Evrard cv. Common (ruzigrass) both accumulated high concentrations of aluminum (Al) in roots. Approximately two thirds of the total Al was complexed by soluble low‐molecular‐weight ligands, suggesting that it had been taken up into the symplasm. We therefore investigated whether these species might employ Al‐chelating organic acids for internal detoxification of Al taken up by root apices, the primary site of Al injury. Unlike root apices of other Al‐resistant plant genotypes, which secrete organic‐acid anions to detoxify Al externally, apices of Brachiaria species accumulated organic acids within the tissue. A comparison with whole roots showed that this preference for accumulation (as opposed to secretion) was restricted to apices. Citric acid, and to a lesser extent trans‐aconitic acid, accumulated in a uniform dose‐dependent manner in root apices of both species as their Al content increased under Al‐toxic growth conditions. Their accumulation was accompanied by a stimulation of malate synthesis in Al‐resistant B. decumbens, while it occurred at the expense of malate in Al‐sensitive B. ruziziensis. These data suggest a role of organic acids in the internal detoxification of Al in root apices of both Brachiaria species, presumably contributing to their comparatively high basal level of Al resistance. Yet internal detoxification of Al by organic acids does not appear to be the principal mechanism responsible for the superior resistance of B. decumbens.
 
Date 2002
2016-11-10T20:29:09Z
2016-11-10T20:29:09Z
 
Type Journal Article
 
Identifier Wenzl, Peter; Chaves, Alba Lucía; Patiño, Gloria M.; Mayer, Jorge Edgard; Rao, Idupulapati Madhusudana. 2002. Aluminum stress stimulates the accumulation of organic acids in root apices of Brachiaria species . Zeitschrift für Pflanzenernährung und Bodenkunde = Journal of Plant Nutrition and Soil Science (Germany) 165(5):582-588.
1436-8730
https://hdl.handle.net/10568/77715
https://doi.org/10.1002/1522-2624(200210)165:5<582
 
Language en
 
Rights Limited Access
 
Format 165(5):582-588
 
Publisher John Wiley
 
Source Zeitschrift für Pflanzenernährung und Bodenkunde