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.

In Côte d'Ivoire, pineapple occupies a prominent place after the coffee and cocoa binomial in exports. The country has long been the leading producer of smooth Cayenne in the European market. However, this dynamism is hampered by the lack of good quality rejects. To overcome this constraint, various methods of in vitro regeneration of plantlets have been initiated. Micro propagation and somatic embryogenesis allow massive production of plants of good sanitary quality. However, acclimatization of the vitro plants is a critical phase. This study was conducted to assess the growth parameters and success rate of vitro plants during acclimatization, as well as the growth potential of vitro plants in the field. To do so, the plants resulting from micropropagation and somatic embryogenesis were evaluated in greenhouse, shade and field. Plants from the mother suckers were used as controls in the field. After acclimatization, a 98% survival rate of the vitro plants was observed. In the field, the vitro plants behaved differently. The growth parameters of plants from somatic embryogenesis were significantly higher than those from micropropagation and plants from mother suckers. In addition, controlling acclimatization is an important asset for mass disposal of pineapple plants for the renewal of the Ivorian orchard. Thus, to develop pineapple cultivation in Ivory Coast, it would be interesting to use juvenile offspring from vitro cultures, in particular from somatic embryogenesis.