Common and unique rhizosphere microbial communities of wheat and canola in a semiarid Mediterranean environment

摘要: Abstract In wheat (Triticum aestivum L.)-based cropping systems, rotation crops often provide a yield benefit to the following crop. This has been documented for legume and canola (Brassica napus L.). present study, we examined bacterial fungal communities in rhizosphere of at six paired locations on fall spring sampling dates using high-throughput sequencing marker genes (bacterial 16S rRNA gene internal transcribed spacers). Soil type was primary driver both communities, with geographically closest, same soil type, clustering together. Season (fall vs sampling) had next strongest effect, followed by crop species. Differences between were more evident than fall. However, contrast, species richness diversity not related location or season, instead consistently higher compared wheat. Many groups shared across species, especially Janthinobacterium Kaistobacter. Bacterial dominated Actinomycetes Acidobacteria. But spring, these shifted fast growing copiotrophs, including Pseudomonas, Janthinobacterium, Flavobacterium, Oxalobacteraceae, Sphingobacteriaceae. Saprotrophic fungi such as Ulocladium, Mortierella, Cryptoccocus, Chaetomium, Penicillium Trichoderma also common to, equally abundant in, crops. Potential root pathogens Thanatephorus (Rhizoctonia) Ceratobasidium, Oculimacula, Typhula, Microdochium canola. conclusion, most bacteria are “host specific” but colonize roots differing relative abundance dependent season. A much smaller group taxa unique specific work provides novel insight into changes when is introduced dryland monoculture systems.