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Endophytic Bacteria Associated with Origanum   heracleoticum L. (Lamiaceae) Seeds.

Giulia SemenzatoTeresa FaddettaSara FalsiniSara Del DucaAntonia EspositoAnna PadulaClaudia GrecoNadia MucciMarco ZaccaroniAnna Maria PugliaAlessio PapiniRenato Fani
Published in: Microorganisms (2022)
Seed-associated microbiota are believed to play a crucial role in seed germination, seedling establishment, and plant growth and fitness stimulation, due to the vertical transmission of a core microbiota from seeds to the next generations. It might be hypothesized that medicinal and aromatic plants could use the seeds as vectors to vertically transfer beneficial endophytes, providing plants with metabolic pathways that could influence phytochemicals production. Here, we investigated the localization, the structure and the composition of the bacterial endophytic population that resides in Origanum heracleoticum L. seeds. Endocellular bacteria, surrounded by a wall, were localized close to the aleurone layer when using light and transmission electron microscopy. From surface-sterilized seeds, cultivable endophytes were isolated and characterized through RAPD analysis and 16S RNA gene sequencing, which revealed the existence of a high degree of biodiversity at the strain level and the predominance of the genus Pseudomonas . Most of the isolates grew in the presence of six selected antibiotics and were able to inhibit the growth of clinical and environmental strains that belong to the Burkholderia cepacia complex. The endophytes production of antimicrobial compounds could suggest their involvement in plant secondary metabolites production and might pave the way to endophytes exploitation in the pharmaceutical field.
Keyphrases
  • plant growth
  • electron microscopy
  • single cell
  • staphylococcus aureus
  • body composition
  • physical activity
  • copy number
  • gene expression
  • high resolution
  • essential oil
  • protein kinase