Use of bioactive chitosan and Lippia multiflora essential oil as coatings for maize and sorghum seeds protection


Essential oil (EO) extracted from leaves of Lippia multiflora were used alone or combined with chitosan at 0.25% and 0.5% as coating solutions for maize and sorghum seeds. Different coating formulations made were tested on seeds to determine their antifungal activity against Rhizopus sp and A. Flavus respectively isolated from sorghum and maize seeds. Coating solutions impact on seeds germination rate and plant growth in the laboratory condition were also evaluated. Results revealed that chitosan and L. Multiflora EO coating used separately exhibited fungicidal effect against Rhizopus sp and fungistatic effect against A. Flavus. When there were associated, the coating formulation demonstrated a strong inhibition against A. flavus and became ineffective against Rhizopus ssp. Chitosan solution (0.25% and 0.5%) without EO significantly increased seeds germination percentage and height maize and sorghum plant. On the other hand, EO coating alone displayed a total inhibition of seeds germination. When EO was mixed with chitosan solution, a decrease in the height of plants was observed.


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