Peroxidase Enzyme Activity of Rhizobacteria-introduced Shallots Bulbs to Induce Resistance of Shallot towards Bacterial Leaf Blight (Xanthomonas Axonopodis pv Allii)

Bacterial leaf blight disease caused by Xanthomonas axonopodis pv allii is an important disease in shallots. The research purpose was to study the activity of peroxidase enzyme in shallots which was introduced by the rhizobacteria isolates and was able to induce resistance to Xaa. The research was conducted by introducing eight isolates of rhizobacteria bacteria in shallots. The results showed that introduced rhizobacteria could increase the activity of peroxidase enzymes, and the isolate PK2Rp3 (Serratia marcescens strain N2.4) was the highest activity in both roots and leaves of 0.058 μm · mL–1 and 0.053 μm · mL–1.