Role of defense enzymes in the induction of host resistance to leaf blight of turmeric (Curcuma longa L.)

K. S. Shilpashree, M. S. Sharada
2020 Kavaka  
The present study highlights the role of defense-related enzymes such as phenylalanine ammonia-lyase (PAL), peroxidase (POX) and polyphenol oxidase (PPO) in inducing resistance in turmeric against fungal leaf blight pathogen (Fr.) Keissler designated as CL1 which was isolated from the infected leaf of L. and subsequently identified on the basis of morphological and molecular sequencing studies. The results of our study indicated that defense enzymes activity was maximum at 24 h for PAL, 12 h
more » ... POX and 48 h for PPO, respectively upon pathogen inoculation in resistant cultivar. The enzyme activity increased significantly (P<0.05) in resistant genotype upon pathogen inoculation. Indeed, the increase in enzyme activities was not significant in case of susceptible genotypes. It is quite apparent from the study that in host-pathogen interaction, the initial infection process involved conidium germination followed by penetration through stomata in both the genotypes. However, it was considerably slow in Hassan-8 genotype due to its resistant nature. The DNA sequence of this pathogenic CL1 has been submitted to NCBI GenBank under the accession number MN307311.
doi:10.36460/kavaka/54/2020/57-63 fatcat:yqhamkny7zfxff4qjlczvdtljq