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- Title
Inter- and intracellular colonization of <italic>Arabidopsis</italic> roots by endophytic actinobacteria and the impact of plant hormones on their antimicrobial activity.
- Authors
van der Meij, Anne; Willemse, Joost; Schneijderberg, Martinus A.; Geurts, René; Raaijmakers, Jos M.; van Wezel, Gilles P.
- Abstract
Many actinobacteria live in close association with eukaryotes such as fungi, insects, animals and plants. Plant-associated actinobacteria display (endo)symbiotic, saprophytic or pathogenic life styles, and can make up a substantial part of the endophytic community. Here, we characterised endophytic actinobacteria isolated from root tissue of <italic>Arabidopsis thaliana</italic> (<italic>Arabidopsis</italic>) plants grown in soil from a natural ecosystem. Many of these actinobacteria belong to the family of <italic>Streptomycetaceae</italic> with <italic>Streptomyces olivochromogenes</italic> and <italic>Streptomyces clavifer</italic> as well represented species. When seeds of <italic>Arabidopsis</italic> were inoculated with spores of <italic>Streptomyces</italic> strain coa1, which shows high similarity to <italic>S. olivochromogenes,</italic> roots were colonised intercellularly and, unexpectedly, also intracellularly. Subsequent exposure of endophytic isolates to plant hormones typically found in root and shoot tissues of <italic>Arabidopsis</italic> led to altered antibiotic production against <italic>Escherichia coli</italic> and <italic>Bacillus subtilis</italic>. Taken together, our work reveals remarkable colonization patterns of endophytic streptomycetes with specific traits that may allow a competitive advantage inside root tissue.
- Subjects
ARABIDOPSIS; PLANT roots; ACTINOBACTERIA; BRASSICACEAE; PLANTS
- Publication
Antonie van Leeuwenhoek, 2018, Vol 111, Issue 5, p679
- ISSN
0003-6072
- Publication type
Article
- DOI
10.1007/s10482-018-1014-z