Stimulateurs des défenses naturelles des plantes : une nouvelle stratégie phytosanitaire dans un contexte d’écoproduction durable.

Assessment of Factors Limiting Production of Citrus among Smallholder Farmers in Benue State, Nigeria

“…In susceptible accessions, an increase in MDA content was observed. Similar results were reported by Benhamou and Rey [34]; Zraibi, et al [27]. They reported an increase in MDA content, an indicator of oxidative degradation of membrane lipids, in leaves of susceptible accessions.…”

“…They reported an increase in MDA content, an indicator of oxidative degradation of membrane lipids, in leaves of susceptible accessions. Srinivasa, et al [33]; Benhamou and Rey [34] explained this result by perturbation of photosynthetic activity. Indeed, Gharbi [35] have reported that lipid degradation is due firstly to a disruption of thycoidal membranes, a loss of integrity of chloroplasts and hence a decrease in photosynthetic activity and secondly to a reduction of the activity of different enzymes of the antioxidant system of leaves.…”

“…Similar results have been reported in various plant species. Indeed, according to [14,34] the global expression of resistance to microbial pathogens is the result of a synergy of coordinated action in time and space between all whether direct or indirect defense mechanisms. Among the indirect mechanisms, there is parietal enhancement by incrustation of polysaccharide molecules, such as callose, phenylpropanoid pathway metabolites, such as lignin and phenolic compounds, and structural proteins and glycoproteins, such as hydroxyproline-rich glycoproteins (HRGPs).…”

“…This parietal enhancement most often results in the formation of new barriers called papillae or parietal appositions which strongly contribute to delay the progression of the pathogen in the plant tissues and to prevent the diffusion of deleterious substances such as walls degrading enzymes, or toxins. Direct mechanisms include, among others, the synthesis of new proteins such as stress proteins, enzymes (antioxidant enzymes for example) and protease inhibitors [15,34] as well as the production of phytoalexins, secondary metabolites with antimicrobial potential [14].…”

Phytochemistry, HPLC profile and antioxidant activity of aqueous extracts of fenugreek (Trigonella foenum graecum L.) seeds grown in arid zones of Algeria

“…Fenugreek (Trigonella foenum graecum L.) is a legume from fabaceae family exploited for culinary and medicinal purposes, widespread in the Mediterranean, North Africa, India and China [1]. Besides its therapeutic properties, it has other characteristics such as the ability to resist multiple environmental constraints, pests, and many pathogenic microorganisms through the synthesis of substances called secondary metabolites [2]. These metabolites provide the antioxidant effect that represents the biological mechanism responsible for not only antibacterial and antifungal activities but also for fighting against various attacks on the plant [3].…”