Dergiler / EurAsian Journal of BioSciences (elektronik) / 2010 / Sayı: 4
Plant growth promoting activities of phosphatesolubilizing Enterobacter asburiae as influenced by fungicides
- Sayı
- 2010 · Sayı: 4
- Sayfa
- 88–95
- DOI
- —
Özet
In vitro sartlarda fungisit toleransli Enterobacter asburiae irk PS2'nin bitki büyüme artirici aktiviteleri üzerindeki etkilerini incelemek amaciyla, dört fungisit - tebukonazol, hekzakonazol, metalaksil ve kitazintavsiye edilen dozlarda ve daha yüksek dozlarda uygulandi. Enterobacter asburiae irk PS2 hardal rizosferinden izole edildi ve fungisitlerin hem varligi hem de yoklugunda, fungisit toleransi ve bitki büyüme artirici özellikleri (fosfat çözünürlügü, sideroforlar, indol asetik acit, ekzo-polisakkaritler, hidrojen siyanit ve amonyak üretimi) açisindan irdelendi. Enterobacter asburiae irk PS2, fungisitlerin varliginda bile bitki büyüme artirici aktivite gösterdi, ancak bu etki fungisit konsantrasyonunun artmasiyla kademeli olarak azaldi. Tavsiye edilen dozda fungisitlerin pek etkisi olmadi, ancak tavsiye edilenden daha yüksek dozdaki fungisit fosfat çözünürlügü, sideroforlar ve indol asetik asit sentesi gibi fizyolojik özellikleri negatif olarak etkiledi. Tüm fungisitler içinde tebukonazol, genel olarak bitki büyüme artirici aktivitelere karsi maksimum toksisite gösterdi. Fungisitlerin varliginda bile büyüme düzenleyiciler üretme özelligi bulunan fungisittoleransli E. asburiae irk PS2'den, fungisit stresli topraklarda yetistirilen ürünlerin verimliligini artirmak için biyo-inokulant olarak faydalanilabilir.
Abstract
Four fungicides, tebuconazole, hexaconazole, metalaxyl and kitazin were applied at recommended and higher rates to examine their effects on the plant growth promoting activities of the fungicide tolerant Enterobacter asburiae strain PS2 under in vitro conditions. Enterobacter asburiae strain PS2 was isolated from the mustard rhizosphere and was assessed for the fungicide-tolerance and production of plant growth promoting traits (phosphate solubilization, siderophores, indole acetic acid, exo-polysaccharides, hydrogen cyanide and ammonia production) both in the presence and absence of fungicides. Enterobacter asburiae strain PS2 showed plant growth promoting activities even in the presence of fungicides which however, decreased progressively with the increase in fungicide concentration. Fungicides at recommended dose had little effect while the dose higher than the recommended one adversely affected the physiological traits, like, phosphate solubilization, siderophore, and indole acetic acid synthesis. Among all fungicides, tebuconazole in general, showed maximum toxicity to plant growth promoting activities. Fungicide-tolerant E. asburiae strain PS2 with the inherent ability to produce growth regulators even in the presence of fungicides can be exploited as a bio-inoculant to increase the productivity of crops grown in fungicide stressed soils.