title: Solanum lycopersicum (tomato) hosts robust phyllosphere and rhizosphere bacterial communities when grown in soil amended with various organic and synthetic fertilizers.
abstract: Due to the intimate association between plants and their microbial symbionts, an examination of the influence of agricultural practices on phytobiome structure and diversity could foster a more comprehensive understanding of plant health and produce safety. Indeed, the impact of upstream crop producti006Fn practices cannot be overstated in their role in assuring an abundant and safe food supply. To assess whether fertilizer type impacted rhizosphere and phyllosphere bacterial communities associating with tomato plants, the bacterial microbiome of tomato cv. 'BHN602' grown in soils amended with fresh poultry litter, commercially available sterilized poultry litter pellets, vermicompost or synthetic fertilizer was described. Culture independent DNA was extracted from bulk and rhizosphere soils, and washes of tomato blossoms and ripe fruit. PCR amplicons of hypervariable regions of the 16S rRNA gene were sequenced and profiled using the QIIME pipeline. Bulk and rhizosphere soil, and blossom and fruit surfaces all supported distinct bacterial communities according to principal coordinate analysis and ANOSIM (R=0.87, p=0.001 in year 1; R=0.93, p=0.001 in year 2). Use of microbiologically diverse organic fertilizers generally did not influence bacterial diversity, community structure or relative abundance of specific taxa on any plant organ surface. However, statistically significant differences in sand and silt contents of soil (p<0.05) across the field and corresponding shifts in water activity were positively (R2=0.52, p=0.005) and negatively (R2=0.48, p=0.009) correlated with changes in bacterial community structure in the rhizosphere, respectively. Over two harvest seasons, this study demonstrated that the application of raw poultry manure, poultry litter pellets and vermicompost had little effect on the tomato microbiome in the rhizosphere and phyllosphere, when compared to synthetically fertilized plants. Plant anatomy, and other factors related to field location, possibly associated with edaphic and air characteristics, were more influential drivers of different tomato organ microbiomes than were diverse soil amendment applications.
authors: Department of Plant Science and Landscape Architecture, University of Maryland, College Park, MD, United States; Division of Microbiology, Office of Regulatory Science, Center for Food Safety & Applied Nutrition, Food and Drug Administration, College Park, MD, United States.
authors: Sarah M
authors: SM
authors: Allard
authors: Department of Plant Science and Landscape Architecture, University of Maryland, College Park, MD, United States.
authors: Christopher S
authors: CS
authors: Walsh
authors: Department of Plant Science and Landscape Architecture, University of Maryland, College Park, MD, United States.
authors: Anna E
authors: AE
authors: Wallis
authors: Division of Microbiology, Office of Regulatory Science, Center for Food Safety & Applied Nutrition, Food and Drug Administration, College Park, MD, United States.
authors: Andrea R
authors: AR
authors: Ottesen
authors: Division of Microbiology, Office of Regulatory Science, Center for Food Safety & Applied Nutrition, Food and Drug Administration, College Park, MD, United States.
authors: Eric W
authors: EW
authors: Brown
authors: Department of Plant Science and Landscape Architecture, University of Maryland, College Park, MD, United States; Center for Food Safety and Security Systems, University of Maryland, College Park, MD, United States. Electronic address: smicall@umd.edu.
authors: Shirley A
authors: SA
authors: Micallef
mesh_terms: D004784:Environmental Monitoring; D005308:Fertilizers / Q000382:microbiology*; D018551:Solanum lycopersicum / Q000254:growth & development / Q000382:microbiology*; D008396:Maryland; D064307:Microbiota / Q000235:genetics*; D010802:Phylogeny; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D058441:Rhizosphere; D012987:Soil / Q000737:chemistry* / Q000592:standards; D012988:Soil Microbiology / Q000592:standards*
chemical_list: D005308:Fertilizers; D012336:RNA, Ribosomal, 16S; D012987:Soil
keywords: Flower microbiome; Fruit microbiome; Organic fertilization; Poultry manure; Soil characteristics; Vermicompost