PMID- 26635733 OWN - NLM STAT- PubMed-not-MEDLINE DCOM- 20151204 LR - 20220310 IS - 1664-302X (Print) IS - 1664-302X (Electronic) IS - 1664-302X (Linking) VI - 6 DP - 2015 TI - Different bacterial communities in heat and gamma irradiation treated replant disease soils revealed by 16S rRNA gene analysis - contribution to improved aboveground apple plant growth? PG - 1224 LID - 10.3389/fmicb.2015.01224 [doi] LID - 1224 AB - Replant disease (RD) severely affects apple production in propagation tree nurseries and in fruit orchards worldwide. This study aimed to investigate the effects of soil disinfection treatments on plant growth and health in a biotest in two different RD soil types under greenhouse conditions and to link the plant growth status with the bacterial community composition at the time of plant sampling. In the biotest performed we observed that the aboveground growth of apple rootstock M26 plants after 8 weeks was improved in the two RD soils either treated at 50 degrees C or with gamma irradiation compared to the untreated RD soils. Total community DNA was extracted from soil loosely adhering to the roots and quantitative real-time PCR revealed no pronounced differences in 16S rRNA gene copy numbers. 16S rRNA gene-based bacterial community analysis by denaturing gradient gel electrophoresis (DGGE) and 454-pyrosequencing revealed significant differences in the bacterial community composition even after 8 weeks of plant growth. In both soils, the treatments affected different phyla but only the relative abundance of Acidobacteria was reduced by both treatments. The genera Streptomyces, Bacillus, Paenibacillus, and Sphingomonas had a higher relative abundance in both heat treated soils, whereas the relative abundance of Mucilaginibacter, Devosia, and Rhodanobacter was increased in the gamma-irradiated soils and only the genus Phenylobacterium was increased in both treatments. The increased abundance of genera with potentially beneficial bacteria, i.e., potential degraders of phenolic compounds might have contributed to the improved plant growth in both treatments. FAU - Yim, Bunlong AU - Yim B AD - Section of Woody Plant and Propagation Physiology, Institute of Horticultural Production Systems, Leibniz Universitat Hannover Hannover, Germany. FAU - Winkelmann, Traud AU - Winkelmann T AD - Section of Woody Plant and Propagation Physiology, Institute of Horticultural Production Systems, Leibniz Universitat Hannover Hannover, Germany. FAU - Ding, Guo-Chun AU - Ding GC AD - College of Resources and Environmental Sciences, China Agricultural University Beijing, China ; Beijing Key Laboratory of Biodiversity and Organic farming, China Agricultural University Beijing, China. FAU - Smalla, Kornelia AU - Smalla K AD - Institute for Epidemiology and Pathogen Diagnostics, Julius Kuhn-Institut - Federal Research Centre for Cultivated Plants Braunschweig, Germany. LA - eng PT - Journal Article DEP - 20151106 PL - Switzerland TA - Front Microbiol JT - Frontiers in microbiology JID - 101548977 PMC - PMC4654428 OTO - NOTNLM OT - DGGE OT - apple replant disease OT - bacterial community composition OT - bacterial diversity OT - biotest OT - pyrosequencing OT - qPCR EDAT- 2015/12/05 06:00 MHDA- 2015/12/05 06:01 PMCR- 2015/11/06 CRDT- 2015/12/05 06:00 PHST- 2015/07/26 00:00 [received] PHST- 2015/10/19 00:00 [accepted] PHST- 2015/12/05 06:00 [entrez] PHST- 2015/12/05 06:00 [pubmed] PHST- 2015/12/05 06:01 [medline] PHST- 2015/11/06 00:00 [pmc-release] AID - 10.3389/fmicb.2015.01224 [doi] PST - epublish SO - Front Microbiol. 2015 Nov 6;6:1224. doi: 10.3389/fmicb.2015.01224. eCollection 2015.