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Differing organic Acid exudation pattern explains calcifuge and acidifuge behaviour of plants.
MedLine Citation:
PMID:  21247915     Owner:  NLM     Status:  In-Data-Review    
Many vascular plant species are unable to colonize calcareous sites. Thus, the floristic composition of adjacent limestone and acid silicate soils differs greatly. The inability of calcifuge plants to establish in limestone sites seems related to a low capacity of such plants to solubilize and absorb Fe or phosphate from these soils. Until now, mechanisms regulating this differing ability of plants to colonize limestone sites have not been elucidated. We propose that contrasting exudation of low-molecular organic acids is a major mechanism involved and show that germinating seeds and young seedlings of limestone plants exude considerably more di- and tricarboxylic acids than calcifuges, which mainly exude monocarboxylic acids. The tricarboxylic citric acid is a powerful extractor of Fe, and the dicarboxylic oxalic acid a very effective extractor of phosphate from limestone soils. Monocarboxylic acids are very weak in these respects. The study is based on ten species from limestone soils and ten species from acid silicate soils.
G Tyler; L Ström
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Annals of botany     Volume:  75     ISSN:  0305-7364     ISO Abbreviation:  Ann. Bot.     Publication Date:  1995 Jan 
Date Detail:
Created Date:  2011-01-20     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0372347     Medline TA:  Ann Bot     Country:  England    
Other Details:
Languages:  eng     Pagination:  75-8     Citation Subset:  -    
Department of Ecology, University of Lund, Ecology Building, S-223 62 Lund, Sweden.
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