scholarly journals Evaluation des similitudes agromorphologiques des géniteurs et descendances F1 dans le croisement de cocotiers (Cocos nucifera L.) Nain Jaune Malaisie x Grand de Vanuatu (NJM x GVT) en Côte d’Ivoire

2020 ◽  
Vol 147 ◽  
pp. 15125-15139
Author(s):  
KOFFI Eric-Blanchard Zadjéhi ◽  
YOBOUE Koffi ◽  
YAO Saraka Didier Martial ◽  
KONAN Jean Louis ◽  
SIE Raoul Sylvère ◽  
...  
Keyword(s):  
Cote D'ivoire ◽  
Côte D’Ivoire ◽  
Cocos Nucifera ◽  
Coconut Palm ◽  
Male Parent ◽  
Cote D’Ivoire ◽  
Coconut Tree ◽  
Côte D'ivoire ◽  
Cocos Nucifera L ◽  
Cultivation Techniques

Objectifs : L’étude a été conduite pour évaluer la ressemblance agromorphologique des descendances hybrides F1 NJM x GVT à celles de leurs géniteurs en Côte d’Ivoire en vue de prédire les caractéristiques des descendants et adopter des techniques culturales et utilisations appropriées. Méthodologie et résultats : Trente variables ont été mesurées sur 18 descendances et leurs géniteurs mâles GVT et femelle NJM. Il ressort que les caractéristiques végétatives des descendances NJM x GVT sont relativement proches de leurs géniteurs mâles GVT. Les héritabilités varient de 10 % à 40 % pour l’ensemble des descripteurs. Elle est plus élevée pour C20, LGF, ILE, ILPRF et Déq avec une valeur de 40 % qui ont plus contribué au rapprochement des descendances de leur géniteur mâle. Des gains agromorphologiques par rapport aux deux géniteurs sont observés pour la plupart des caractères. Les taux varient en moyenne de 0,73 % à 84,26 % selon le caractère et le géniteur. Conclusion et applications des résultats : Ces résultats serviront de guide aux sélectionneurs quant aux résultats attendus d’une descendance F1 de cocotier Grand croisé par cocotier Nain. Ces hybrides peuvent être cultivés et utilisés de la même manière que leur géniteur mâle. Mots clés : Cocotier, caractéristique agromorphologique, hybride NJM x GVT, héritabilité, gain. Assessment of agromorphological similarities between parents and F1 progenies in the crossing of Dwarf Malayan x Vanuatu Tall coconuts in Côte d’Ivoire ABSTRACT Objectives: The study was conducted to assess the agromorphological resemblance of the F1 NJM x GVT hybrid progenies to those of their parents in Côte d'Ivoire in order to predict the characteristics of the descendants and adopt appropriate cultivation techniques and uses. Methodology and results: Thirty variables were measured on 18 descendants and their male parents GVT and female NJM. It appears that the vegetative characteristics of the NJM x GVT descendants are relatively close to their male GVT sires. Heritability ranges from 10% to 40% for all descriptors. It is higher for C20, LGF, ILE, ILPRF and Déq with a value of 40% that contributed more to the approximation of the descendants of their male parent. Agromorphological gains compared to the two spawners are observed for most characters. The rates vary on average from 0.73% to 84.26% depending on the trait and the sire. Conclusion and application of the results: These results will serve as a guide for breeders as to the expected results of an F1 offspring of large coconut palm crossed by Dwarf coconut tree. These hybrids can be grown and used in the same way as their male parent. Key words: Coconut palm, agromorphological characteristic, NJM x GVT hybrid, heritability, gain.

scholarly journals Assessment of Sap Production Parameters From Spathes of Four Coconut (Cocos nucifera L.) Cultivars in Côte d’Ivoire

2013 ◽  
Vol 2 (4) ◽  
pp. 87
Author(s):  
Ysidor N’guessan Konan ◽  
Jean Louis Konan Konan ◽  
Rebecca Rachel Assa ◽  
Brou Roger Konan ◽  
Joelle Muriel Djeya Okoma ◽  
...  
Keyword(s):  
Cote D'ivoire ◽  
Sap Flow ◽  
Côte D’Ivoire ◽  
Cocos Nucifera ◽  
Cote D’Ivoire ◽  
Production Parameters ◽  
Côte D'ivoire ◽  
Economic Roles ◽  
Cocos Nucifera L

<p>Several palm plants have social and economic roles worldwide by providing drinks from their sap. In Côte d’Ivoire, management of the coconut sap is not yet practiced. In this study, parameters related to production of sap have been assessed from four coconut cultivars namely PB 113<sup>+</sup> and PB 121<sup>+</sup> hybrids and WAT and MYD varieties. From all the unopened inflorescences (spathes) studied into the coconut crown, whose ranks varied from 7 to 9, that of rank 8 yielded the highest volume of sap. From this spathe, the PB113<sup>+</sup> hybrid provided the best yield of sap (61.81 ± 20.41 l). Most important proportion of that sap volume was recorded at the morning harvesting. The sap production duration of a spathe varied from 24 ± 1.87 days (MYD) to 46.78 ± 1.86 days (PB 113<sup>+</sup>). That duration depended on the length of spathes and regular sap flow allowed by them. Furthermore, the PB 113<sup>+</sup> had the highest number of fruits (NBF = 174.33 ± 78.45 fruits). The results showed that volume of sap available is closely related to the length of production (r = 0.78) and the cultivar’s nut yield (r = 0.82). The use of PB 113<sup>+</sup> hybrid which provided highest quantity of sap is recommended for promoting the production of coconut sap in Côte d’Ivoire in order to improve the benefits derived from this plant.</p>

Anagrus nedotepae sp. n. (Hymenoptera: Mymaridae), an egg parasitoid of Nedotepa curta (Hemiptera: Cicadellidae), a pest of coconut palm in West Africa

Zootaxa ◽  
2017 ◽  
Vol 4276 (1) ◽  
pp. 134
Author(s):  
SERGUEI V. TRIAPITSYN ◽  
K. ERIC KWADJO ◽  
YAIMA AROCHA ROSETE
Keyword(s):  
West Africa ◽  
Cote D'ivoire ◽  
Côte D’Ivoire ◽  
Coconut Palm ◽  
Economic Losses ◽  
Social Significance ◽  
Cote D’Ivoire ◽  
Type Series ◽  
Côte D'ivoire ◽  
Lethal Yellowing

A new Afrotropical species of Anagrus Haliday (Hymenoptera: Mymaridae), A. nedotepae Triapitsyn sp. n., is described and illustrated. The type series was reared from parasitized eggs of the leafhopper Nedotepa curta Dmitriev (Hemiptera: Cicadellidae) during a survey for its natural enemies in Côte d’Ivoire. This peculiar leafhopper, recently described from Ghana (Dmitriev 2016), lays its eggs on leaflets of coconut palm, and could be an economically important pest of this crop in West Africa, particularly because it is a suspected vector of the phytoplasma associated with the Côte d’Ivoire Lethal Yellowing disease of coconut, as characterized by Arocha-Rosete et al. (2014). Coconut lethal yellowing diseases cause severe economic losses to the very important coconut growing industry in several West African countries and elsewhere, being considered a threat of global economic and social significance (Gurr et al. 2016). Thus, the parasitoid may be of potential importance for natural biological control of this pest and urgently needs a scientific name to be used in further publications on its biology and ecology. Such studies are currently underway by the second author, who collected the type series of the new species. 

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