title: Enhancing plant productivity while suppressing biofilm growth in a windowfarm system using beneficial bacteria and ultraviolet irradiation.
abstract: Common problems in a windowfarm system (a vertical and indoor hydroponic system) are phytopathogen infections in plants and excessive buildup of biofilms. The objectives of this study were (i) to promote plant health by making plants more resistant to infection by using beneficial biosurfactant-producing Pseudomonas chlororaphis around the roots and (ii) to minimize biofilm buildup by ultraviolet (UV) irradiation of the water reservoir, thereby extending the lifespan of the whole system with minimal maintenance. Pseudomonas chlororaphis-treated lettuce grew significantly better than nontreated lettuce, as indicated by enhancement of color, mass, length, and number of leaves per head (p < 0.05). The death rate of the lettuce was reduced by ∼ 50% when the lettuce was treated with P. chlororaphis. UV irradiation reduced the bacteria (4 log reduction) and algae (4 log reduction) in the water reservoirs and water tubing systems. Introduction of P. chlororaphis into the system promoted plant growth and reduced damage caused by the plant pathogen Pythium ultimum. UV irradiation of the water reservoir reduced algal and biofilm growth and extended the lifespan of the system.
authors.affiliation: a Environmental Science and Graduate Program, The Ohio State University, Columbus, Ohio, USA.
authors.forename: Seungjun
authors.initials: S
authors.lastname: Lee
authors.affiliation: b Department of Food Science and Technology, The Ohio State University, Columbus, Ohio, USA.
authors.forename: Chongtao
authors.initials: C
authors.lastname: Ge
authors.affiliation: c Department of Civil, Environmental and Geodetic Engineering, The Ohio State University, Columbus, Ohio, USA.
authors.forename: Zuzana
authors.initials: Z
authors.lastname: Bohrerova
authors.affiliation: d Department of Entomology and Plant Pathology, University of Tennessee, Knoxville, Tennessee, USA.
authors.forename: Parwinder S
authors.initials: PS
authors.lastname: Grewal
authors.affiliation: a Environmental Science and Graduate Program, The Ohio State University, Columbus, Ohio, USA.|b Department of Food Science and Technology, The Ohio State University, Columbus, Ohio, USA.|e College of Public Health, Division of Environmental Health Sciences, The Ohio State University, Columbus, Ohio, USA.
authors.forename: Jiyoung
authors.initials: J
authors.lastname: Lee
mesh_terms: D018441:Biofilms / Q000254:growth & development / Q000528:radiation effects*; D018545:Lactuca / Q000254:growth & development* / Q000382:microbiology / Q000528:radiation effects; D018515:Plant Leaves / Q000254:growth & development / Q000382:microbiology / Q000528:radiation effects; D018517:Plant Roots / Q000254:growth & development / Q000382:microbiology / Q000528:radiation effects; D011549:Pseudomonas / Q000502:physiology* / Q000528:radiation effects; D014466:Ultraviolet Rays
keywords: Pseudomonas chlororaphis; Pythium ultimum; UV irradiation; irradiation UV; laitue romaine; romaine lettuce; windowfarm; « windowfarm »