Effects of bacterial communities on the sensitivity of the phytoplankton Stephanodiscus minutulus and Desmodesmus armatus to tannic acid

Aquatic Microbial Ecology

Hans-Peter Grossart¹  Nadine Bauer¹  Sabine Hilt¹ 

关键词: Allelochemicals;    Macrophyte–bacteria–phytoplankton interaction;    Bacteria communities;    Sensitivity test;    Tannic acid;   

DOI  :  10.3354/ame01402

学科分类：生物科学（综合）

来源: Inter-Research

【 摘 要 】

ABSTRACT: We investigated whether bacteria affect the sensitivity of Stephanodiscus minutulus (diatom) and Desmodesmus armatus (green alga) to tannic acid (TA). TA is a water soluble secondary plant metabolite which is released by submerged macrophytes and acts as an allelochemical because of its polyphenolic nature. Sensitivity of S. minutulus and D. armatus to TA changed in the presence of specific bacterial communities and bacterial isolates growing on TA. Without bacteria, growth of S. minutulus was inhibited by TA whereas the presence of bacteria pre-treated with high TA concentrations led to increased algal growth. Addition of sterile TA degradation products of bacterial isolates reduced inhibition of D. armatus. Differences in algal growth after TA addition were accompanied by changes in bacterial community composition (BCC) detected by DGGE and subsequent sequencing. This indicates that phytoplankton sensitivity to TA can be mediated by accompanying bacteria due to changes in BCC, which in turn are influenced by pre-treatment (different TA concentrations) and mode of addition of allelochemicals (pulsed or semi-continuous). Our study demonstrates that effects of allelochemicals on algal growth can be substantially changed by interference with microorganisms, which has not previously received attention.

【 授权许可】

Unknown