Mutants showing spontaneous cell death in the absence of pathogen attack are called lesion mimic mutants(lmm)(Lorrain et al.,2003).These mutants usually exhibit typical hypersensitive responses(HRs)within or around the lesion spots,which are frequently observed in plants challenged with Mutants showing spontaneous cell death in the absence of pathogen attack are called lesion mimic mutants (lmm) (Lorrain et al., 2003). These mutants usually exhibit typical hypersensitive responses (HRs) within or around the lesion spots, which are frequently observed in plants challenged with