Influx and efflux of organic acids across the soil-root interface of Zea mays L. and its implications in rhizosphere C flow

David L. Jones, Peter R. Darrah

Research output: Contribution to journalArticle

119 Citations (Scopus)

Abstract

The influx and efflux of organic acids across the root-soil interface were investigated in intact, sterile maize (Zea mays L.) roots under a variety of experimental conditions. Under nutrient-sufficient conditions the efflux of organic acids was shown to constitute < 1% of the total C lost across the root-soil interface. Under severe nutrient stress, however, the rates of malate and citrate efflux from the root increased 33 and 12 fold respectively. Influx experiments indicated that roots could not directly reabsorb citrate-Fe3+ or other metal complexes from solution. Influx of citrate was observed only at high external citrate concentration (≥ 1 m M) or from solutions with low ionic strengths. It was postulated that citrate influx is of little importance in a soil environment.

Original languageEnglish
Pages (from-to)103-109
Number of pages7
JournalPlant and Soil
Volume173
Issue number1
DOIs
Publication statusPublished - 1 Jun 1995
Externally publishedYes

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