2019, VOLUME 6 ISSUE 1Pages: 08-14
Effects of chitosan on vegetative organs growth and peroxidases activities in cassava (Manihot esculenta Crantz) cultivars YACE, 9620A, TMS4(2)1425 and TMS30572
Kouakou Dappah KRA*, Seu Jonathan GOGBEU, Kafana SORO, Kouassi Joseph KOUAKOU, Koffi II Nazaire KOUASSI and Denezon Odette DOGBO
*Laboratory of Biology and Improvement of Plant Production, University Nangui Abrogoua, Côte d\\\\\\\'Ivoire
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In this work, the influence of chitosan on vegetative organs growth and peroxidases activities in cassava (Manihot esculenta, Euphorbiaceae) plants grown in hydroponic was studied. The experiment was carried out under a greenhouse lit by natural light at the Ecology Research Center (Côte d’Ivoire). Six concentrations of chitosan (0, 25, 50, 75, 100 and 125 mg L-1) added to the culture media were tested on four cassava cultivars (Yace, 9620A, TMS4(2)1425 and TMS30572). These media are renewed every 15 days and growth of the plants lasted two months. The results showed that chitosan stimulated the growth of 1.1 to 1.4 according to cultivars and organs. Peroxidases activities were 1.5 to 2.6 times higher in leaves and roots in presence of 75 or 100 mg L-1 of chitosan depending on the cultivars. This activity is multiplied by 2.3 to 2.6 respectively in leaves and roots of Yacé, 2.6 and 1.5 of TMS30572, 1.9 and 2.2 of TMS4(2)1425. In 9620A, this factor was less than 2. These results show that chitosan could be a biostimulator in cassava.