RRC ID 64528
Author Kurokawa M, Nakano M, Kitahata N, Kuchitsu K, Furuya T.
Title An efficient direct screening system for microorganisms that activate plant immune responses based on plant-microbe interactions using cultured plant cells.
Journal Sci Rep
Abstract Microorganisms that activate plant immune responses have attracted considerable attention as potential biocontrol agents in agriculture because they could reduce agrochemical use. However, conventional methods to screen for such microorganisms using whole plants and pathogens are generally laborious and time consuming. Here, we describe a general strategy using cultured plant cells to identify microorganisms that activate plant defense responses based on plant-microbe interactions. Microbial cells were incubated with tobacco BY-2 cells, followed by treatment with cryptogein, a proteinaceous elicitor of tobacco immune responses secreted by an oomycete. Cryptogein-induced production of reactive oxygen species (ROS) in BY-2 cells served as a marker to evaluate the potential of microorganisms to activate plant defense responses. Twenty-nine bacterial strains isolated from the interior of Brassica rapa var. perviridis plants were screened, and 8 strains that enhanced cryptogein-induced ROS production in BY-2 cells were selected. Following application of these strains to the root tip of Arabidopsis seedlings, two strains, Delftia sp. BR1R-2 and Arthrobacter sp. BR2S-6, were found to induce whole-plant resistance to bacterial pathogens (Pseudomonas syringae pv. tomato DC3000 and Pectobacterium carotovora subsp. carotovora NBRC 14082). Pathogen-induced expression of plant defense-related genes (PR-1, PR-5, and PDF1.2) was enhanced by the pretreatment with strain BR1R-2. This cell-cell interaction-based platform is readily applicable to large-scale screening for microorganisms that enhance plant defense responses under various environmental conditions.
Volume 11(1)
Pages 7396
Published 2021-4-1
DOI 10.1038/s41598-021-86560-0
PII 10.1038/s41598-021-86560-0
PMID 33795728
PMC PMC8016971
MeSH Agriculture Arabidopsis Arabidopsis Proteins / genetics Brassica rapa / microbiology DNA, Ribosomal / metabolism Endophytes Fungal Proteins / metabolism Gene Expression Regulation, Plant / drug effects Genes, Plant / drug effects Immune System Phylogeny Plant Cells / metabolism Plant Diseases / microbiology Plant Immunity / drug effects Plant Leaves / metabolism Plants / immunology* Plants / microbiology* Pseudomonas syringae / genetics RNA, Ribosomal, 16S / metabolism Reactive Oxygen Species Seedlings / metabolism Tobacco / microbiology
IF 3.998
Arabidopsis / Cultured plant cells, genes rpc00001 rpc00008