期刊
JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE
卷 93, 期 15, 页码 3891-3896出版社
WILEY
DOI: 10.1002/jsfa.6392
关键词
rhizosphere; aluminium; phosphate; Phaseolus; organic acids
资金
- Austrian Science Fund (FWF) [P20069-B16]
- Italian MIUR (FIRB-Programma 'Futuro in Ricerca')
- Free University of Bolzano [TN5056]
- Provincia Autonoma di Bolzano [Rhizotyr-TN5218]
- Austrian Science Fund (FWF) [P20069] Funding Source: Austrian Science Fund (FWF)
BACKGROUNDPlants differ in their response to high aluminium (Al) concentrations, which typically cause toxicity in plants grown on acidic soils. The response depends on plant species and environmental conditions such as substrate and cultivation system. The present study aimed to assess Al-phosphate (P) dynamics in the rhizosphere of two bean species, Phaseolus vulgaris L. var. Red Kidney and Phaseolus lunatus L., in rhizobox experiments. RESULTSRoot activity of the bean species induced up to a sevenfold increase in exchangeable Al and up to a 30-fold decrease in extractable P. High soluble Al concentrations triggered the release of plant-specific carboxylates, which differed between soil type and plant species. The results suggest that P. vulgaris L. mitigates Al stress by an internal defence mechanism and P. lunatus L. by an external one, both mechanisms involving organic acids. CONCLUSIONRhizosphere mechanisms involved in Al detoxification were found to be different for P. vulgaris L. and P. lunatus L., suggesting that these processes are plant species-specific. Phaseolus vulgaris L. accumulates Al in the shoots (internal tolerance mechanism), while P. lunatus L. prevents Al uptake by releasing organic acids (exclusion mechanism) into the growth media. (c) 2013 Society of Chemical Industry
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