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The earthworm Aporrectodea caliginosa stimulates abundance and activity of phenoxyalkanoic acid herbicide degraders

Title data

Liu, Ya-Jun ; Zaprasis, Adrienne ; Liu, Shuang-Jiang ; Drake, Harold L. ; Horn, Marcus A.:
The earthworm Aporrectodea caliginosa stimulates abundance and activity of phenoxyalkanoic acid herbicide degraders.
In: The ISME Journal. Vol. 5 (2011) Issue 3 . - pp. 473-485.
ISSN 1751-7362
DOI: https://doi.org/10.1038/ismej.2010.140

Abstract in another language

2-Methyl-4-chlorophenoxyacetic acid (MCPA) is a widely used phenoxyalkanoic acid (PAA) herbicide. Earthworms represent the dominant macrofauna and enhance microbial activities in many soils. Thus, the effect of the model earthworm Aporrectodea caliginosa (Oligochaeta, Lumbricidae) on microbial MCPA degradation was assessed in soil columns with agricultural soil. MCPA degradation was quicker in soil with than without earthworms. Quantitative PCR was inhibition-corrected per nucleic acid extract and indicated that copy numbers of tfdA-like and cadA genes (both encoding oxygenases initiating aerobic PAA degradation) in soil with earthworms were up to 3 and 4 times higher than without earthworms, respectively. tfdA-like and 16S rRNA gene transcript copy numbers in soil with earthworms were 2 and 6 times higher than without earthworms, respectively. Most probable numbers (MPNs) of MCPA-degraders approximated 4x105 gdw-1 in soil prior to incubation and in soil treated without earthworms, whereas MPNs of earthworm-treated soils were approximately 150 x higher. The aerobic capacity of soil to degrade MCPA was higher for earthworm treated than not earthworm-treated soil. Burrow walls and 0 to 5 cm depth bulk soil displayed higher capacities to degrade MCPA than did soil from 5-10 cm depth bulk soil, expression of tfdA-like genes in burrow walls was 5 times higher than in bulk soil, and MCPA degraders were abundant in burrow walls (MPNs of 5x107 gdw-1). The collective data indicate that earthworms stimulate abundance and activity of MCPA degraders endogenous to soil via their burrowing activities and might thus be advantageous for enhancing PAA degradation in soil.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER86319
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Biology > Chair Ecological Microbiology
Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Biology
Research Institutions
Research Institutions > Research Centres
Result of work at the UBT: Yes
DDC Subjects: 500 Science
Date Deposited: 29 Jul 2015 05:53
Last Modified: 29 Jul 2015 05:53
URI: https://eref.uni-bayreuth.de/id/eprint/17337