Light and Microbial Lifestyle: The Impact of Light Quality on Plant–Microbe Interactions in Horticultural Production Systems—A Review
Beatrix W. Alsanius,
Maria Karlsson,
Anna Karin Rosberg,
Martine Dorais,
Most Tahera Naznin,
Sammar Khalil,
Karl-Johan Bergstrand
Affiliations
Beatrix W. Alsanius
Department of Biosystems and Technology, Microbial Horticulture Unit, Swedish University of Agricultural Sciences, SLU, P.O. Box 103, SE-230 53 Alnarp, Sweden
Maria Karlsson
Department of Biosystems and Technology, Microbial Horticulture Unit, Swedish University of Agricultural Sciences, SLU, P.O. Box 103, SE-230 53 Alnarp, Sweden
Anna Karin Rosberg
Department of Biosystems and Technology, Microbial Horticulture Unit, Swedish University of Agricultural Sciences, SLU, P.O. Box 103, SE-230 53 Alnarp, Sweden
Martine Dorais
Département de Phytologie, Centre de Recherche et d’Innovation sur les Végétaux (CRIV), Université Laval, Pavillon Envirotron, Local 1216, Québec City, QC G1V 0A6, Canada
Most Tahera Naznin
Department of Biosystems and Technology, Microbial Horticulture Unit, Swedish University of Agricultural Sciences, SLU, P.O. Box 103, SE-230 53 Alnarp, Sweden
Sammar Khalil
Department of Biosystems and Technology, Microbial Horticulture Unit, Swedish University of Agricultural Sciences, SLU, P.O. Box 103, SE-230 53 Alnarp, Sweden
Karl-Johan Bergstrand
Department of Biosystems and Technology, Horticultural Crop Physiology Unit, Swedish University of Agricultural Sciences, SLU, P.O. Box 103, SE-230 53 Alnarp, Sweden
Horticultural greenhouse production in circumpolar regions (>60° N latitude), but also at lower latitudes, is dependent on artificial assimilation lighting to improve plant performance and the profitability of ornamental crops, and to secure production of greenhouse vegetables and berries all year round. In order to reduce energy consumption and energy costs, alternative technologies for lighting have been introduced, including light-emitting diodes (LED). This technology is also well-established within urban farming, especially plant factories. Different light technologies influence biotic and abiotic conditions in the plant environment. This review focuses on the impact of light quality on plant−microbe interactions, especially non-phototrophic organisms. Bacterial and fungal pathogens, biocontrol agents, and the phyllobiome are considered. Relevant molecular mechanisms regulating light-quality-related processes in bacteria are described and knowledge gaps are discussed with reference to ecological theories.
