Cotton is a versatile plant grown for the fibers and these seeds. However, its culture dating numbers constraints productions including pest attacks. Faced with these attacks certain control methods prove ineffective. The research will be directed on stimulation of the natural defenses of the plant by applying elicitors to find an effective alternative to chemical control. Thus, the study of the influence of two elicitors (ethephon and methyl jasmonate) on the biosynthesis of phenolic compounds in the cultivar Y331B showed that the phenolic metabolism is significantly altered after treatment of the leaves by the elicitors. Two elicitors cause an increase in the production of phenolic compounds. However, the methyl jasmonate has the greater accumulation of phenolic compounds with respect to ethephon. Moreover, the co-processing of sheets by MeJA and ethephon has permit to obtain a significant increase in the levels of phenolic compounds.
The study aimed at controlling the mycelial growth and germination of Mycosphaerella fijiensis in Petri dish by using three plant defense stimulators. Approximately, 2 mL of each stimulator (Vacciplant®, Callel® and calliete®) were added to the different M. fijiensis culture media. The results obtained show that Vacciplant® and Callel® promote the in vitro growth of M. fijiensis contrary to calliete® which inhibits it. Indeed, it causes total mortality (100%) of conidia at the sporulation stage.
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