Journal of Agricultural Faculty of Gaziosmanpaşa University 1300-2910 2147-8848 Tokat Gaziosmanpaşa Üniversitesi 10.55507/gopzfd.1529947 Plant Bacteriology in Agriculture Medicinal and Aromatic Plants Soil Sciences and Ecology Tarımda Bitki Bakteriolojisi Tıbbi ve Aromatik Bitkiler Toprak Bilimi ve Ekolojisi Biberiye Rizosferindeki Yararlı Rizobakterilerin Tanımlanması ve Bitki Gelişimini Teşvik Edici Özelliklerinin Belirlenmesi Identification of Beneficial Bacteria in Rosemary Rhizospheres and Determination of Plant Growth Promoting (PGP) Potential https://orcid.org/0000-0002-3074-6458 Güler Murat Milli Eğitim Bakanlığı 12 31 2024 41 3 201 208 08 07 2024 11 20 2024 Copyright © 1985, Gaziosmanpaşa Üniversitesi Ziraat Fakültesi Dergisi 1985 Gaziosmanpaşa Üniversitesi Ziraat Fakültesi Dergisi

Bitki büyümesini teşvik eden rizobakteriler (PGPR), rizosferde kolonize olan, doğrudan ya da dolaylı olarak bitki büyümesini destekleyen çevre dostu faydalı bakterilerdir. Bu çalışmada, Rosmarinus officinalis L. (Biberiye) rizosferinden on üç izolat MALDI-TOF-MS methodu ile tanımlanarak morfolojik, biyokimyasal, bitki büyümesini teşvik edici özellikleri ile Fusarium oxysporum’a karşı antagonistik özellikleri değerlendirildi. Tüm izolatlar arasında 9 izolatın azot fikse ettiği, 8 izolatın norganik fosfatı çözdüğü, 8 izolatın siderofor ürettiği, 7 izolatın IAA (indole-3-acetic acid) ürettiği ve 6 izolatın HCN ürettiği belirlendi. BBR-6 izolatı, Fusarium oxysporum’a karşı % 61.54’lük bir inhibisyon oranıyla en yüksek antifungal aktiviteyi gösterdi. BBR-10 izolatı ise % 19.40 ile F. oxysporum’a karşı en zayıf etkiyi gösterdi. PGPR'ler üzerindeki araştırmalar son zamanlarda artsa da biberiye üzerine yapılan araştırmalar hala sınırlıdır. Bu çalışma, biberiye rizosferindeki yerel bakteri topluluğunu tanımlamayı, bitki büyümesini teşvik edici özelliklerini, mikrobiyal gübre ve biyokontrol ajan potansiyeli ile biberiye bitkisinde kök hastalığa neden olan F. oxysporum’a karşı antifungal aktivitesini değerlendirmeyi amaçlamaktadır.

Plant growth-promoting rhizobacteria (PGPR), which colonize the rhizosphere, are eco-friendly and beneficial bacteria that directly or indirectly promote plant growth. In this study, 13 isolates from the rhizosphere of Rosmarinus officinalis L. (Rosemary) were identified using MALDI-TOF-MS to assess morphology, biochemistry, and plant growth-promoting traits and to evaluate their antagonistic effects against Fusarium oxysporum. Among all isolates, 9 isolates fixed nitrogen, 8 isolates dissolved inorganic phosphate, 8 isolates produced siderophores, 7 isolates produced IAA (Indole-3-Acetic Acid), and 6 isolates produced HCN. Isolate BBR-6 showed the highest antifungal activity against Fusarium oxysporum, with an inhibition rate of 61.54 %. The isolate BBR-10 (19.40 %) showed the weakest effect against F. oxysporum. Although research on PGPRs has increased recently, research on rosemary is still limited. This study aimed to identify the local bacterial community in the rhizosphere of rosemary and assess its growth-promoting properties and antifungal activity against disease-causing F. oxysporum, potentially acting as a microbial fertilizer and biocontrol agentents.

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