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Engelhardt IC, Welty A, Blazewicz SJ, Bru D, Rouard N, Breuil MC, Gessler A, Galiano L, Miranda JC, Spor A, Barnard RL. Depth matters: effects of precipitation regime on soil microbial activity upon rewetting of a plant-soil system. ISME JOURNAL 2018; 12:1061-1071. [PMID: 29476139 DOI: 10.1038/s41396-018-0079-z] [Citation(s) in RCA: 50] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/22/2017] [Revised: 12/21/2017] [Accepted: 12/29/2017] [Indexed: 12/20/2022]
Abstract
Changes in frequency and amplitude of rain events, that is, precipitation patterns, result in different water conditions with soil depth, and likely affect plant growth and shape plant and soil microbial activity. Here, we used 18O stable isotope probing (SIP) to investigate bacterial and fungal communities that actively grew or not upon rewetting, at three different depths in soil mesocosms previously subjected to frequent or infrequent watering for 12 weeks (equal total water input). Phylogenetic marker genes for bacteria and fungi were sequenced after rewetting, and plant-soil microbial coupling documented by plant 13C-CO2 labeling. Soil depth, rather than precipitation pattern, was most influential in shaping microbial response to rewetting, and had differential effects on active and inactive bacterial and fungal communities. After rewetting, active bacterial communities were less rich, more even and phylogenetically related than the inactive, and reactivated throughout the soil profile. Active fungal communities after rewetting were less abundant and rich than the inactive. The coupling between plants and soil microbes decreased under infrequent watering in the top soil layer. We suggest that differences in fungal and bacterial abundance and relative activity could result in large effects on subsequent soil biogeochemical cycling.
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Affiliation(s)
- Ilonka C Engelhardt
- Agroécologie, INRA, AgroSup Dijon, Univ. Bourgogne Franche-Comté, F-21000, Dijon, France
| | - Amy Welty
- Agroécologie, INRA, AgroSup Dijon, Univ. Bourgogne Franche-Comté, F-21000, Dijon, France.,Department of Plant Pathology and Microbiology, Iowa State University, Ames, IA, 50011, USA
| | - Steven J Blazewicz
- Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, CA, 94550, USA
| | - David Bru
- Agroécologie, INRA, AgroSup Dijon, Univ. Bourgogne Franche-Comté, F-21000, Dijon, France
| | - Nadine Rouard
- Agroécologie, INRA, AgroSup Dijon, Univ. Bourgogne Franche-Comté, F-21000, Dijon, France
| | - Marie-Christine Breuil
- Agroécologie, INRA, AgroSup Dijon, Univ. Bourgogne Franche-Comté, F-21000, Dijon, France
| | - Arthur Gessler
- Swiss Federal Research Institute WSL, Zuercherstr. 111, 8903, Birmensdorf, Switzerland
| | - Lucía Galiano
- Swiss Federal Research Institute WSL, Zuercherstr. 111, 8903, Birmensdorf, Switzerland
| | - José Carlos Miranda
- Forest History, Physiology and Genetics Research Group, Universidad Politecnica de Madrid, Ciudad Universitaria s/n, 28040, Madrid, Spain
| | - Aymé Spor
- Agroécologie, INRA, AgroSup Dijon, Univ. Bourgogne Franche-Comté, F-21000, Dijon, France
| | - Romain L Barnard
- Agroécologie, INRA, AgroSup Dijon, Univ. Bourgogne Franche-Comté, F-21000, Dijon, France.
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