Relationship between the Intensity of Latex Harvesting and the Tapping Panel Dryness Expression of Clone GT 1 of Hevea brasiliensis Muell Arg in South-East Côte d'Ivoire
Obouayeba Samuel *
National Center for Agronomic Research (CNRA), Research Station of Bimbresso, BP 1536 Abidjan, Côte D’ivoire.
Konan Djezou
National Center for Agronomic Research (CNRA), Research Station of Bimbresso, BP 1536 Abidjan, Côte D’ivoire.
Diarrassouba Moussa
Ecole Normale Supérieure d’Abidjan, 08 BP 10 Abidjan Côte d’Ivoire.
Lehi Malidy Irénné
University Félix Houphouët Boigny, UFR (Faculty) of Biosciences, Laboratory of Plant Physiology, Abidjan, 22 BP 582 Abidjan Côte d’Ivoire.
Koffi Antoine
University Jean Lorougnon Guédé, UFR (Faculty) of Agroforestry, Laboratory of improvement of Agricultural Production, Daloa, Côte d’Ivoire, BP 150 Daloa.
Ballo Esperence Kouadio
University Jean Lorougnon Guédé, UFR (Faculty) of Agroforestry, Laboratory of improvement of Agricultural Production, Daloa, Côte d’Ivoire, BP 150 Daloa.
Adou Bini Yao Christophe
National Center for Agronomic Research (CNRA), Research Station of La-Mé, 01 BP1536 Abidjan 01, Côte d’Ivoire.
Essehi Jean Lopez
National Center for Agronomic Research (CNRA), Research Station of Bouaké, Côte d’Ivoire, Central Soil, Water and Plant Laboratory (LCSEP) Sustainable Soil and Water Management Programmed (GDSME), 01 BP 633 Bouaké 01, Côte d'Ivoire.
*Author to whom correspondence should be addressed.
Abstract
Tapping panel dryness is an important limiting factor in rubber productivity of Hevea brasiliensis. In order to assess the sensitivity to this syndrome, the effect of two intensive latex harvesting technologies on moderately metabolized GT1 clone, has been studied in the South-Eastern region of Côte d'Ivoire. The rubber trees were planted according to the experimental mono-tree device, "One tree one plot design" a tree constituting a repetition, and 31 trees per treatment, selected on circumference and health status criteria. The parameters measured were rubber production, circumference increase, physiological profile and tapping panel dryness sensitivity. The results showed that induction of tapping panel dryness in latex harvesting system, S/2 d/3 6d/7 ET 10 % Pa 1 (1) 1/ w) was significantly low (0.18 ± 0,22 %) than that of the control (S d/1 6d/7 unstimulated, 1.43 ± 1.45 %). Productivity of this particular system was also good (62 ± 16.32 g.a-1.s-1) and it especially has less stress that can cause physiological fatigue, or even the notch dry. Otherwise, Rubber production, radial vegetative growth, physiological parameters of the latex and the tapping panel dryness rate were influenced by the two treatments applied to GT 1. In addition, the medium and high sucrose contents (16.5 ± 3.01%) and thiol group (0.51 ± 0.13 mmol.l-1) of the latex in the treatment (S/2 d/3 6d/7 ET 10% Pa 1 (1) 1 / w), were instrumental in the response to this stimulation. The sensitivity to the tapping panel dryness is in very close linear relation with the harvest intensity of the latex to which the GT 1 clone has been subjected. These results corroborate and confirm the moderate sensitivity to the tapping panel dryness of GT 1 clone.
Keywords: Hevea brasiliensis, physiological profile, tapping panel dryness, Côte d’Ivoire