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PCR amplification of different fragments of NBS-LRR region of Pi9 gene from positive control, IRBL9-w (A) and six rice landraces (B–G). M, Molecular marker (1 kb) and lane A to G, PCR fragment obtained from overlapping fragments of Pi9 allele. Pi9_1 primer (740 bp), Pi9_2 primer (836 bp), Pi9_3 primer (808 bp), Pi9_4 primer (791 bp), Pi9_5 primer (742 bp).
