Exploitation of localized phosphorus-patches by common bean roots

S. Snapp, R. Koide, Jonathan Paul Lynch

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34 Scopus citations


Phosphorus (P) uptake from patches was investigated in high-P and low-P common bean (Phaseolus vulgaris L.) plants using a split-root system. A P-patch was developed by exposing a small sub-section of the root system to localized P enrichment. A soil-based media was used to provide realistically low, buffered levels of P. In addition, nutrient solution provided zero and 1 m M P to low-P and high-P plants, respectively. Overall, growth of low-P plants was approximately 40% that of high-P plants. Mycorrhizal infection by G. etunicatum had little detectable influence on plant growth. Root length exploring a P-patch was comparable for low-P and high-P plants, yet low-P plants allocated half as much root biomass and P to a P-patch compared to high-P plants. This was achieved by an increase in the investment in fine, terminal roots exploring a P-patch in low-P plants. P uptake per investment of dry weight in the P-patch was over 50% higher for high-P plants compared to low-P plants. The higher P-uptake efficiency in high-P plants was achieved despite the greater production of fine roots in low-P plants.

Original languageEnglish (US)
Pages (from-to)211-218
Number of pages8
JournalPlant and Soil
Issue number2
StatePublished - Dec 1 1995

All Science Journal Classification (ASJC) codes

  • Soil Science
  • Plant Science


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