Specification of Rhizospheric Characteristics of Some Bacteria Identified by MALDI TOF MS from Agricultural Soils in Kirsehir Province (Akçakent and Çiçekdağı) Districts

Abstract

The rhizosphere are site of plant-microorganism interaction, and have critical impotance in events like nutrient supply, the production of compounds that support plant growth and phytopathogen protection. This study reports 52 bacteria isolated from 5 different plant rhizospheres (Hordeum vulgare, Avena sativa, Cicer arietinum, Helianthus annuus, and Phaseolus vulgaris) of two agricultural districts of Kırşehir (Akçakent and Çicekdağı regions) in Türkiye. Morphological, biochemical, plant growth-promoting characteristics (including production of indole-3-acetic acid, siderophore, nitrogen fixation, and phosphate solubilization) using MALDI-TOF-MS techniques were used to identify the isolates. Among all isolates, 33 isolate were Gram positive and 19 were Gram negative. Furthermore 40% of them were classified as Bacillus species, 10% belonged to Pseudomonas species, 7% were Acinetobacter species, 4% were Pantoeae species, and 39% other species (Blastomonas, Lysinibacillus, Comamonas, Alcaligenes, Bifidobacterium, Aromatoleum). It was seen that 12 isolates fixed nitrogen, 8 isolates produced dissolved inorganic phosphate, 12 isolates produced siderophores, 9 isolates were produced by IAA, and 14 isolates produced HCN during the screening of plant growth promoting properties. It is concluded that the culture of bacteria living in the rhizosphere are essential to promote soil fertility and sustainable agriculture. Therefore, there is a need to identify and use these strains with plant growth promoting properties in agriculture.