Abstract
The polymerase chain reaction (PCR) was used to identify Tilletia indica, the causal agent of Karnal bunt of wheat. The method uses two sets of oligonucleotide primers developed by sequence analysis of cloned Dra I fragments of mitochondrial DNA of T. indica. The primer pair TI17M1 (5'-TCCCCTTGGATCAGAACGTA-3') and TI17M2 (5'-AGAAGTCTAACTCCCCCCTCT-3'), derived from clone pTI-MD17, amplified a single 825-bp product from all isolates of T. indica and no products for other Tilletia species. In addition, the primer pair TI57M1 (5'-TTTTCCCTCTCTC-CTTTTTTCA-3') and TI57M2 (5'-AGCAAAGACAAAGTAGGCTTCC-3'), derived from clone pTI-MD57, produced a product of 118 bp which was unique to T. indica.
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