Screening of recombinant inbred lines for resistance to bacterial leaf blight pathotypes in rice (Oryza sativa L.)

In the present investigation 16 recombinant inbred lines (RIL’s) developed from intra-specific cross between YH3 and AKDRMS 21-54 through Marker Assisted Pedigree Breeding Method were screened along with their parents checks, namely, BPT 5204, TN1 Improved Samba Mahsuri (ISM) against IxoPt-20 pathotype at ICAR-Indian Institute of Rice Research, Hyderabad during Rabi 2021-22 a new Xanthomonas oryzae pv. causing Bacterial Leaf Blight disease in rice Regional Agricultural Research Station, Maruteru Kharif 2022 to identify specific resistant sources. Morpho-Molecular screening was adopted evaluate over two locations consecutive seasons 2022. Based on per cent diseased leaf area, genotypes scored categorised as Standard Evaluation System (SES) scale provided by International (IRRI). The results revealed all RIL’s be either (10) or moderately (6) pathotype. However, only five found resistant, while four for virulent Seven reaction pathotype, showed susceptible Among identified each BPT-1901-72-10-6, BPT-1901-108-4-1 BPT-1901-111-3-2 uniformly while, BPT-1901-45-8-6 BPT-1901-163-1-18 both IXoPt-20 Maruteru, respectively, indicating potential genetic stocks development cultivars bacterial blight disease.