Phylloplane microbes have been studied as strategic tools in management against plant
pathogens. Non-pathogenic bacteria and fungi have been applied as crop protectants
against various plant diseases. The present study aimed at evaluating the potentiality of
Aspergillus niger spores in altering the activity of four key enzymes related to defense in
tomato. The experiment was designed such that two groups of 50 tomato plants were considered: group 1 – sprayed with autoclaved distilled water (control) and group 2 – sprayed
with A. niger spores. Spraying was carried out under aseptic conditions. The experimental parameters included analysis of the activity of peroxidase (POX), polyphenol oxidase
(PPO), phenylalanine ammonia lyase (PAL) and tyrosine ammonia lyase (TAL) as well
as expression of POX and PPO isoforms. The results demonstrated an inductive effect of
A. niger on the activity of POX, PPO, PAL and TAL. Enhanced expression of POX and PPO
isoforms was also observed. The results indicated that A. niger can be considered probiotic
for the management of tomato against its phytopathogens.
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