Selection of local Indonesian rice accession resistance to bacterial leaf blight

Abstract Rice cultivation is disrupted by the presence of leaf blight disease ( Xanthomonas oryzae pv. oryzae ). Research purposes of this study was to test the resistance of 100 rice local accessions from Indonesia, against bacterial leaf blight (BLB) strains III, IV and VIII. The rice accessions were obtained from genebank collection at ICABIOGRAD, Bogor, Indonesia. Rice seeds were germinated and planted at 21 days after sowing (DAS) on the farmer’s field trial in Sukabumi, Indonesia. Line transplanting was applied with a spacing of 25cm × 25cm and 1m × 2m between line. Split plot design in a randomized block design with 3 replications was used. Inoculation was carried out at 60 days after planting (DAP) using the clipping technique on the top of rice shoots. The variable observed was the area of leaves affected by disease, assessed using a disease severity scale of 0-9. The results found 12 accessions were resistant to strain III namely Padai Tuan, Padai Bereh, Padai Alle, Siam, Unggul, Ikeng, Ketan Hitam, Tuan, Ekor Payau 1, Ekor Payau 2, Ketan Merah, and Adan; two accessions were resistant to strain IV, namely Ramos Dewi and Padai Mulut Melayang; and one accession was resistant to strain VIII, namely Padai Kley. This results were beneficial to the future study on rice breeding program for BLB-resistant, especially in Indonesia.