Induksi Resistansi terhadap Asam Fusarat pada Tunas Pisang Tanduk In Vitro Menggunakan Asam Salisilat dan Mikroba Endofitik

Abstract

Fusarium wilt is important disease in bananas production. There are not yet commercial cultivar of bananas that really resistant to this disease. Induced resistance is an alternative way to get banana resistance to fusarium wilt. Induce resistance may be done in in vitro shoots culture of bananas chemically or biologically, then the shoots are treated with the toxin of Fusarium oxysporum namely fusaric acid to have a look of resistance response. Some chemical compounds are potential to induce disease resistance in plants like salicylic acid. Endophytic bacteria also can induced disease resistance in plants. The research was done to evaluate the response of in vitro banana shoots "Tanduk" to fusaric acid treatment and effects of salicylic acid and endophytic bacteria on fusaric acid resistance of banana shoots in vitro. There are two experiment in this research. The first one is the response of banana shoots to four level of fusaric acid and the second one is the response of banana shoot to fusaric acid after prior treatment with salicylic acid and endophytic bacteria. The results of the tlrst experiment show that almost 50% of shoots tissues was died at 39.6 mg/l of fusaric acid and 90 -100% at 78.43 mg/l and 116.50 mg/l of fusaric acid. The LDso is at 46.74 mg/l fusaric acid. Sub lethal dose is at 93.23 mg/l offusaric acid. Toxic symptom in the shoots was showed by and blackening of the shoots. The second experiment showed the prior treatments with salicylic acid or B. substi'lis ERB21 do not yet induce the resistance of banana shoots "Tanduk" to fusaric acid in vi/roo