Akademik Veri Yönetim Sistemi
II. International Aegean Scientific Studies Congress, Muğla, Türkiye, 15 - 16 Mart 2025, ss.224, (Özet Bildiri)
The growth of the world's population raises concerns that current agricultural activity and
food production will not be sufficient in the future. Particularly in recent years, the increase in
soil pollution and the greenhouse effect have led to various strategies being tried to increase
agricultural productivity. Plant Growth Promoting Bacteria (PGPB) are microorganisms
found in parts of plants such as roots (rhizosphere), shoots (endosphere) and have an
important effect on plant health and productivity. PGPB have mechanisms such as nitrogen
fixation, Indole Acetic Acid-3 (IAA) production, Aminocyclopropane-1-Carboxylic Acid
(ACC) deaminase activity, phosphate solubilisation, siderophore production, phytohormone
production and antimicrobial activity. These mechanisms may allow PGPB to interact with
plants to improve nutrient uptake from the soil, prevent plant pathogen colonisation around
the plant and increase plant resistance to environmental stress. For this reason, it is very
important for sustainable agriculture to identify the PGPB suitable for the plants used in
agriculture and to determine the PGP activity of these bacteria. In this study, the PGP
properties of endophytic bacteria isolated from Centaurea ensiformis, an endemic
hyperaccumulator plant distributed in Sandras Mountain, Turkey, were evaluated. A
comparison of the IAA production capacities of the bacteria showed that 68.2% of the isolates
had IAA production capacities of less than 10 µg/mL, 27.3% had IAA production capacities
between 10 - 15 µg/mL and 4.5% had IAA production capacities of more than 20 µg/mL. Of
the 22 endophytic bacteria, only 3 bacterial isolates showed ACC deaminase activity No
phosphate solubilising capacity was detected in the isolated endophytic bacteria. It was also
shown that 72.7% of the endophytic bacteria had the ability to produce siderophores. The
highest siderophore production capacity (zone diameter ˃ 30 mm) was observed in colonies
C55 and C49.