DOI: 10.36347/sjavs.2018.v05i10.006

Pages: 563-569

Abstract: Durability of teak (Tectona grandis) has made it a highly sought-after species in shipbuilding industry. Today in Côte d’Ivoire, its culture has been confronted with fungal pathogens. To remedy this, present work has aimed to study some natural defenses of plant by taking as markers peroxidases (POX) and polyphenoloxidases (PPO) activities. Salicylic acid (5 mM) and chitosan (100 mg L-1) were used as elicitors in 110-day-old plants. On directly treated leaves (local reaction), maximum values of polyphenoloxidases activities were very quickly recorded in presence of chitosan 4 hours after treated (h.a.t) (0.31 ΔOD.min-1.mg-1.prot) and salicylic acid 8 h.a.t (0.41 ΔOD.min-1.mg-1.prot) while peroxidases activities reacted late, 12 h.a.t. (8.58 ΔOD.min-1.mg-1.prot with chitosan and 10.48 ΔOD.min-1.mg-1.prot with salicylic acid). In systemic reaction (untreated leaves), all leaves reacted to elicitors. However, nearest leaves (leaf opposite to treated leaf) were quickly stimulated, 12 h.a.t. with salicylic acid (0.30 ΔOD.min-1.mg-1.prot for PPO and 9.69 ΔOD.min-1.mg-1.prot for POX), 8 h.a.t (0.37 ΔOD.min-1.mg-1.prot for PPO) and 24 h.a.t (7.68 ΔOD.min-1.mg-1.prot for POX) with chitosan. However, in general, systemic reaction was set up after local reaction. These results showed that salicylic acid and chitosan compounds could be used as elicitors in teak.