Biocontrol of plant diseases has emerged as an eco-friendly measure of plant protection
and has experienced a lot of devotion in the last two decades. Biocontrol agents include
application of microbial agents, their secretion products and natural extracts from different
parts of several plants. The present study, therefore, aimed at evaluating the potency of
aqueous extracts of Tagetes erecta L. (marigold) in controlling bacterial speck disease in
tomato plants. The experimental design consisted of two groups of 50 plants each: group 1
– sprayed with sterile water (control); and group 2 – sprayed with marigold extract. Spraying
was performed under aseptic conditions at the third node from the base of each plant.
Challenge inoculation with the bacterial speck pathogen Pseudomonas syringae pv. tomato
was performed to analyze the disease severity on the test plants. The parameters of study
were analysis of alteration in the activity and gene expression of peroxidase (POX), phenyl
ammonia lyase (PAL), and polyphenol oxidase (PPO), as well as isoform expression of POX
and PPO. The results demonstrated strong inductive effects of the extract on the activity
and genes of POX, PAL and PPO. De novo expression of POX and PPO isoforms following
marigold extract treatment was also observed. The observations indicate that marigold
extract could be a promising biopesticide.
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