Induction of Resistance on Shallots (Allium ascalonicum) using the isolates of Indigenus Rhizoplant Bacteria in controlling Hawar Leaf Bacteria (Xanthomonas axonopodis pv.allii) Disease

Oleh :

Yulmira Yanti*, Zurai Resti, Munzir Busniah

*)    Staf pengajar Jurusan Hama dan Penyakit Tumbuhan Fakultas Pertanian

Universitas Andalas Padang

ABSTRACT

Research Induction  Resistance on Onion (Allium ascalonicum) using Isolates  of indigenus rhizoplant bacteria in controlling Hawar Leaf Bacteria (HLB) disease by bacteria (Xanthomonas axonopodis pv.allii) in onion crops was conducted in Laboratory. The objective of the study was to obtain  isolates of indigenus rhizoplant  bacterial able to control HLB disease and increase growth of onion plants. Completely Randomized Design (CRD) was used, consisting of 10 treatments and 4 replications. Treatment was 9 isolates of indigenus rhizoplant bacteria. Variables measured were the characters of morphology and physiology covering Gram reaction, production of enzymes pektinase, spore staining, hypersensitivity reaction test, test-3Acetid hormone Indole Acid (IAA) and pathogenicity tests. Observation of diseases progression and growth were: the incubation period, the percentage of infected leaves, the intensity of infected leaves, the infected tillers, plant height, leaf number, number of tubers,. The results showed that Isolates TL2RP1.4, TL2RP2.2, JB1RP2 and ULG1RP2 had a better ability in suppressing HLB attacks. Isolates  ULG1RP2, STP1RP3 and  TP3RP1.2 were capable to increase the growth of onion plants.

Keywords: hormone indole acid, onion, rhizoplant, (Xanthomonas axonopodis pv.allii)

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