Growth response of the bacterial community to pH in soils differing in pH

Research output: Contribution to journalArticle

Abstract

The effect of pH on the instantaneous growth of soil bacterial communities was studied in five soils with different pH (4.5-7.8) using leucine (Leu) and thymidine (TdR) incorporation. The pH dependency of bacterial growth was modelled using three different unimodal functions, and the pH(opt) for growth and the pH range in which growth was > 50% of the optimal growth were compared. Leu and TdR incorporation yielded very similar results. The best fits were obtained using a third-degree polynomial function and the cardinal pH model. However, a simple second-degree function was adequate in most cases, yielding very similar pH(opt) values to the other two models. Bacterial growth was highly influenced by pH, showing optimum growth at a pH related to the soil pH. The lowest pH(opt) was found in the most acidic soil and the highest pH(opt) in the soil with the highest pH. The pH(opt) for bacterial growth was close to the soil pH measured in water, but higher (0.7-2.1 units) than the pH measured with 0.1 M KCl. The pH range in which bacterial growth was > 50% of that at optimum was, on average, 1.7 units below and above the optimum pH.

Details

Authors
Organisations
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Biological Sciences

Keywords

  • pH(max), pH(opt), pH(min), response curves, soil pH, bacterial community
Original languageEnglish
Pages (from-to)149-156
JournalFEMS microbiology ecology
Volume73
Issue number1
Publication statusPublished - 2010
Publication categoryResearch
Peer-reviewedYes