Karakter Fisiologis dan Peranan Antibiosis Bakteri Perakaran Graminae terhadap Fusarium dan Pemacu Pertumbuhan Tanaman Pisang
Abstract
ABSTRACT. Eliza, A. Munif, I Djatnika, and Widodo. 2007. Physiological Characters and Antibiosis Activity of Gramineous Crops Rhizobacteria, Againts Fusarium and Banana Growth Promoting. Roots of Gramineous colonized by various populated bacteria are potential as biological control agents to various soil-borne plant pathogens. This research was conducted to study some physiological characteristics, antibiosis activity to Fusarium oxysporum f. sp. cubense (Foc), and plant growth promoting effect of gramineous crops roots bacteria to bananas. Cucumber was used as an indicator plant to detect plant growth activity. The experiment was conducted at Mycology Laboratory and Glasshouse Bogor Agriculture Institute from June until November 2003. Highest level population density of rhizobacteria (8.12 log cfu/g fresh root) was showed by giant grass roots, while endophytic bacteria were indicated by sorghum roots (4.02 log cfu/g fresh root). Forty two isolates of 182 isolates was physiologically characterized using specific medium. Among of tested bacteria, 60.41, 52.08, 4.16, 18.75, 52.09, and 18.75%, showed the capability in cellulolitic, proteolitic, HCN production, phosphate solubilization, and fluorescent activities, respectively. Using dual culture test of a randomized complete design, 21.45% of 182 isolates showed antibiosis activity against Foc, and more than one third (7.7%) of those were endophytic bacteria from rice roots. Inhibition ability of bacteria on TSA medium was higher than on PDA or PDA + TSA. Based on bioassay test in greenhouse used randomized block design, 22.92 % of 52 isolates have growth promoting activity on tested plant. Bacteria from rhizosphere and endophytic of Gramineous roots have ability to inhibit of F. oxysporum f. sp. cubense and increasing plant growth.
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PDFDOI: http://dx.doi.org/10.21082/jhort.v17n2.2007.p%25p
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