Lavanta (Lavandula Angustifolia) Bitkisinden İzole Edilen Endofitik Bakterilerin Antifungal Etkisinin Belirlenmesi
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2025
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Bu çalışmada, lavanta bitkisinin kök ve kök boğazından 70 endofitik bakteri izole edilmiştir. Bu izolatların morfolojik, fizyolojik ve biyokimyasal aktiviteleri incelenmiştir. Endofitik izolatların patojenlere karşı % inhibisyon oranları Neoscytalidium dimidiatum'a karşı %89 ile %3,7 arasında Fusarium culmorum'a karşı ise %88 ile %8 arasında ve Fusarium oxysporum'a karşı %71,8 ile %36,1 arasında farklılık göstermiştir. İzolatların fizyolojik ve biyokimyasal özellikleri, antagonistik aktiviteleri, enzim aktiviteleri, siderofor üretimleri dikkate alınarak etkili 5 izolat seçilmiştir. İn-vitro koşullarda etkili bulunan 5 izolatın 16S rRNA gen tabanlı sekans analizi sonucuna göre LA 24, LA25, LA32, LA58 ve LA62 kodlu izolatların Bacillus spp. olduğu tespit edilmiştir. İn-vivo serada yapılan saksı denemesi çalışmaları sonucunda, kök daldırma ve toprağa inokule edilen Bacillus spp. (LA24+LA62) karışımları ile inokule edilmiş lavanta bitkilerinde diğer endofitik bakteri izolatlarına ve kontrole göre daha iyi sonuçlar vermiştir. Bu uygulamanın lavanta bitkisinin bitki boyu, yaş ağırlık, kuru ağırlık, kök yaş ağırlığı, kök kuru ağırlığı ve kök uzunluğu ve hastalıklara karşı en etkili sonuçlar verdiğini göstermiştir. Bunu takip eden diğer etkili uygulama ise lavanta bitkilerine inokule edilmiş Bacillus sp. (LA25) bakteri uygulaması olmuştur. Çalışmadan elde edilecek sonuçlar ile endofitik bakterilerin sürdürülebilir organik lavanta yetiştiriciliğinde diğer endofitik bakteri izolatlarına ve kontrole göre etkili bulunan izolatın daha sonra ticari olarak kullanılmak üzere sunulacaktır. Anahtar kelimeler: Antagonistik aktivite, tıbbı ve aromatik bitkiler, Lavandula angustifolia
In this study, 65 endophytic bacteria were isolated from lavender plants. The morphological, physiological, and biochemical properties and enzyme activities of endophytic bacteria were investigated. In the test of tolerance of isolates to different temperature degrees, isolate LA6 was positive at 4°C, and all other isolates were negative. From the 41°C isolates, isolates LA42 and LA46 were negative, and all other isolates were positive. From endophytic bacteria, isolates LA1, LA5, LA6, LA7, LA8, LA11, LA12, LA13, LA25, LA28, LA41, LA45, LA48, LA50, LA53, and LA61 gave positive results in their tolerances at 10% NaCl concentration. In the carbohydrate test, isolates gave positive results between 71% and 91%. All isolates gave positive results in the phosphatase activity and protease activity of endophytic bacteria. Among other enzyme activities, 86% of the isolates gave positive results in cellulase activity, ACC deaminase activity, and nitrate reduction. 75% of the isolates gave positive results in siderophore production, and effective results were obtained. The % inhibition rates of endophytic isolates against pathogens varied between 3.7% and 78% against Neoscytalidium dimidiatum, between 8% and 80% against Fusarium culmorum, and between 36.1% and 61.8% against Fusarium oxysporum. As a result of this study, promising results are seen in the potential use of endophytic bacteria isolated from lavender as biofertilizer.
In this study, 65 endophytic bacteria were isolated from lavender plants. The morphological, physiological, and biochemical properties and enzyme activities of endophytic bacteria were investigated. In the test of tolerance of isolates to different temperature degrees, isolate LA6 was positive at 4°C, and all other isolates were negative. From the 41°C isolates, isolates LA42 and LA46 were negative, and all other isolates were positive. From endophytic bacteria, isolates LA1, LA5, LA6, LA7, LA8, LA11, LA12, LA13, LA25, LA28, LA41, LA45, LA48, LA50, LA53, and LA61 gave positive results in their tolerances at 10% NaCl concentration. In the carbohydrate test, isolates gave positive results between 71% and 91%. All isolates gave positive results in the phosphatase activity and protease activity of endophytic bacteria. Among other enzyme activities, 86% of the isolates gave positive results in cellulase activity, ACC deaminase activity, and nitrate reduction. 75% of the isolates gave positive results in siderophore production, and effective results were obtained. The % inhibition rates of endophytic isolates against pathogens varied between 3.7% and 78% against Neoscytalidium dimidiatum, between 8% and 80% against Fusarium culmorum, and between 36.1% and 61.8% against Fusarium oxysporum. As a result of this study, promising results are seen in the potential use of endophytic bacteria isolated from lavender as biofertilizer.
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ISPEC Journal of Agricultural Sciences (Online)
Volume
9
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1
Start Page
190
End Page
55
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