Identifikasi Gen Ketahanan terhadap (Xanthomonasoryzae pv. Oryzae), penyebab Penyakit Hawar Daun Bakteri padaPlasma Nutfah Padi Lokal Sulawesi Selatan

Abstract
One of limiting factor in rice production especially in South Sulawesi was the bacterial leaf blight (BLB) caused by Xanthomonas oryzae pv. Oryzae (Xoo). In South Sulawesi, it had been reported that 58% Xoo of race III were dominant in Bone, Sopeng, Wajo, Sidrap, Barru, Pangkep. Meanwhile, 23% of race IV and 19% of race VIII were dominant in Maros. The effort that considered the most effective to control BLB disease was the planting of resistant variety. The rice variety assembling by using the resistance genes from various cultivars gave the opportunity to produce the BLB-resistant variety. This research aimed to identify BLB disease-resistant gene on local rice germplasm from South Sulawesi based on the association analysis between phenotype resistance and genotype marker of resistance gene to Xoo. The analysis of phenotype resistance testing was done by using three races of BLB, races III, IV, and VIII with IRBB differential varieties. Meanwhile, the genotype analysis was done by using the molecular marker linked to BLB-resistant trait. For linkage analysis between the both of data was done the association analysis between the both of data with Cladogram analysis on Tassel Program. The resistance testing result showed almost all of the local rice in South Sulawesi was resistant to race III, 6 accessions were resistant to race IV and 6 accessions were resistant to race VIII. The association analysis result was known the markers that significant to mark the resistance trait from every race. Marker Xa26-SN2 was significant to mark the resistance trait to race III, the marker Xa1-SN15, Xa4-SN44, Xa13-SN51, and Xa21-SN6 were significant to race IV, marker Xa7-SN57 and RM20589 were significant to race VIII. These markers pottentially as a MAS (Marker Assisted Selection) markers that could be used to aasist the selection of local rice germplasm from South Sulawesi.