Morphological Diversity among 18 Genitors of Vanuatu Tall (VTT) Coconut (Cocos nucifera L.) Population used in Crosses for Hybrids Resistant to Lethal Yellowing Disease Selection at Port-Bouët, Côte d’Ivoire

Sie, RS; Koffi, EZ; Konan, Kouame; Yao, Koffi Clément; Doh, Franceline; Issali, AE; Allou, Kouassi; Yao, Sdm

doi:10.15580/gjas.2016.4.020416032

Cited by 4 publications

(3 citation statements)

References 2 publications

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“…They are grown for their superior longevity, high yield, hardiness, wind resistance, and high genetic variability and diversity of nuts, shell, kernel and oil yield (COGENT, 2017;Koffi et al, 2019;Pandiselvam et al, 2018;Rajesh et al, 2014). The genetic improvement work carried out at the Ivorian Coconut Research Station has made it possible to develop numerous disease-resistant and high-yielding coconut hybrids from crosses between Tall and Dwarf varieties (Bourdeix et al, 1992;Koffi et al, 2014). Thus, 53 cultivars have been developed at the Marc Delorme Coconut research station in order to provide farmers with planting material with high disease tolerance and good agronomic characteristics.…”

Section: Introductionmentioning

confidence: 99%

Fruit morphological characteristics at different maturity stages of coconut (Cocos nucifera L.) improved hybrids (PB113+, PB121+) and their parent males (RIT+, WAT+)

Kouadio,

Konan,

Doubi

et al. 2023

Afr. J. Agric. Res.

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Cocos nucifera L. is an important coastal crop in Côte d'Ivoire, with 53 coconut cultivars. The present study was carried out to compare the morphophysical characteristics of C. nucifera L. fruit of the improved parents Rennell Island Tall (RIT + ) and West Africa Tall (WAT + ) and their hybrids PB113 + and PB121 + , harvested at different maturity. The ANOVA results showed that cultivar and maturity had a significant effect (p < 0.05) on all morphological characteristics studied, except for sphericity, H 2 , H 3 , and H 4 where maturity was not statistically significant (p ≥ 0.05). The morphological parameters of RIT + coconuts were statistically different from those of WAT + , PB113 + and PB121 + (p < 0.05). The WAT + coconuts had high kernel thickness. The hybrid PB121 + was more spherical than other fruits and had a higher shell thickness. Improved Rennell Island Tall as a parent had good kernel water mass and large shape, while the improved West Tall Africa had good kernel thickness. Concerning PB113 + and PB121 + hybrids, they were similar in dimensional parameters. However, PB121 + fruits had the highest mass and volume, kernel mass, and shell mass compared to PB113 + . This study showed variabilities between the improved cultivars WAT + , RIT + and the PB121 + and PB113 + hybrids.

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Section: Introductionmentioning

confidence: 99%

Fruit morphological characteristics at different maturity stages of coconut (Cocos nucifera L.) improved hybrids (PB113+, PB121+) and their parent males (RIT+, WAT+)

Kouadio,

Konan,

Doubi

et al. 2023

Afr. J. Agric. Res.

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“…La collection mondiale compte plus de 300 écotypes de cocotier Grand et Nain décrits et répertoriés selon des marqueurs morphologiques, biochimiques et moléculaires. Dans la collection au champ de Côte d'Ivoire, les marqueurs moléculaires de types biochimique (Benoit et Ghesquière, 1984 ;Jay et al, 1989), RFLP (Lebrun et al, 1998), AFLP (Teulat et al, 2000) et SSR (Konan et al, 2007a;Konan et al, 2011 ;Yao et al, 2013) ainsi que les marqueurs agromorphologiques (Koffi et al, 2013 ;Yao et al, 2015 ;Koffi et al, 2016 ;Koffi et al, 2019 ;Daramcoum et al, 2017 ;Yao et al, 2019a ;Yao et al, 2019b) ont largement été utilisés pour sonder la diversité existante au sein et entre les populations de cocotiers Grand, Nain et hybrides. Cependant, les travaux mentionnant l'utilisation des caractères morphologiques qualitatifs pour la caractérisation et la typologie des populations de cocotier Grand sont sommaires et moins nombreux.…”

Section: Introductionunclassified

Apport des descripteurs qualitatifs dans l’identification des accessions de cocotier Grand pour les programmes de régénération des collections au champ

Yao¹,

Koffi²,

Daramcoum³

et al. 2020

Int. J. Bio. Chem. Sci

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Les descripteurs qualitatifs ont été toujours négligés dans les études de caractérisation du cocotier surtout chez les écotypes de type Grand. Cet article se propose de mettre en évidence la contribution de six caractères morphologiques de type qualitatif dans la description et la typologie de 18 populations de cocotier Grand plantées dans la collection internationale de Côte d’Ivoire. Pour y arriver les stipes, les inflorescences, les fleurs femelles et les fruits ont été observés. Compte tenu à la fois de leurs fortes valeurs d’indice de diversité de Shannon normalisé (H’ variant entre 0,93 et 0,99) et faibles valeurs d’indice de diversité de Simpson (D variant entre 0,24 et 0,28), les caractères formes du fruit et de la noix débourrée ont été les plus discriminants. Les résultats de la classification des populations de cocotier Grand de la collection de Côte d’Ivoire utilisant les caractères qualitatifs sont en désaccord avec la structuration admise et fournie antérieurement à partir des marqueurs morphologiques quantitatifs et moléculaires microsatellites (SSRs). Bien que longtemps marginalisé dans l’étude de la diversité génétique des écotypes Grand de cocotier, l’apport des caractères qualitatifs dans l’identification de ces accessions de la collection de Côte d’Ivoire est discuté. Aussi, l’intérêt du recours aux descripteurs qualitatifs comme alternative aux marqueurs moléculaires pour le suivi de la pureté des accessions de cocotier au champ pendant les cycles de régénération est souligné.© 2020 International Formulae Group. All rights reserved. English abstract Qualitative morphological descriptors have always been neglected in coconut population’s characterization, especially in Tall coconut varieties. This paper proposes the contribution of six qualitative traits in the description and typology of 18 Tall coconut populations planted at the international field genebank of Côte d'Ivoire. Relatively to high values of standardized index of Shannon Weaver diversity H' (0.93 to 0.99) and low values of Simpson diversity index D (0.24 to 0.28), the two qualitative traits that are fruit and husked nut shapes were more discriminating. The results about clustering of the Tall coconut populations in Côte d'Ivoire genebank using all studied qualitative characters were in disagreement with the clustering assumed and provided before from quantitative traits and SSRs molecular markers. Although a long time marginalized in the genetic diversity studies, the contribution of the qualitative traits in the identification of Tall coconut populations in international field genebank of Côte d’Ivoire has been discussed. Also, the interest of recourse of the qualitative descriptors as alternative to the molecular markers for purity follow-up of the coconut accession during the cycles of field genebank regeneration is clearly underlined.

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“…Il est rapporté que la forme non arrondie qui caractérisent les noix des cocotiers Grand de Vanuatu (GVT), un écotype tolérant au JM, lui permet de produire de nombreuses noix par régime (Bourdeix et al, 2005). De même, entre écotypes nains non-améliorés de cocotiers, le NVS produit plus de fruits par arbre (103,3 noix arbre-1 à l'âge de moins de 9 ans) avec des formes allongées (Le Saint et al, 1983 ;Koffi et al, 2016) que le Nain Jaune Malaisie (NJM) et le Nain Vert de Guinée Equatoriale (NVE). Les hybrides d'autofécondation F2 et F3 de cocotier Nain plus productifs en semences par régime que leurs parents non-améliorés pourraient être conseillés aux producteurs.…”

Section: Introductionunclassified

Diversité agro-morphologique précoce d’hybrides d’autofécondation F3 de cocotier (<i>Cocos nucifera</i> L.) impliquant l’écotype Nain Vert Sri Lanka (NVS) tolérant à la maladie du Jaunissement Mortel

Daramcoum¹,

Yao²,

Konan³

et al. 2017

J. App. Bioscience.

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Daramcoum et al., J. Appl. Biosci. 2017 Diversité agro-morphologique précoce d'hybrides d'autofécondation F3 de cocotier impliquant l'écotype Nain Vert Sri Lanka (NVS) tolérant à la maladie du Jaunissement Mortel. 11052Journal of Applied Biosciences 112: 11045-11051 ISSN 1997-5902 Diversité agro-morphologique précoce d'hybrides d'autofécondation F3 de cocotier (Cocos nucifera L.) impliquant l'écotype Nain Vert Sri Lanka (NVS) tolérant à la maladie du Jaunissement Mortel 11053ABSTRACT Early agro-morphological diversity assessment in self-pollination coconut (Cocos nucifera L.) hybrids F3 involving Sri Lanka Green Dwarf (SGD) ecotype tolerant to Lethal Yellowing (LY) disease of Ghana Objectives: To obtain morphological diversity precociously in self-pollination dwarf coconut cross generations created in Côte d'Ivoire, mature hybrid seeds and seedlings were studied. Indeed, in coconut palm where the period between planting and fruiting times varies from 3 years, the full morphological characterization at the field takes a long duration. Methodology and results: Twenty-one morphological traits measured on the mature hybrid seeds and seedlings from F3 CRD x SGD, F3 PILD05 x SGD and F2 MYD x MYD (control) hybrids were studied. The results revealed two morphological clusters as different genetic pools which one gathers self-pollination hybrids F3 implying the ecotype Sri-Lanka Green Dwarf (SGD) tolerant to the Lethal Yellowing (LY) disease and the other control cross F2 MYD x MYD sensitive to LY. Three types of morphological traits (types I, II and III) implied in the differentiation of the tolerant and sensitive hybrids relatively to LY disease were also identified. Conclusion and implementation of the results: For Côte d'Ivoire coconut breeding program, these two identified genetic pools and the quantitative traits that characterize them could be exploited in the research of the QTLs associated with LY disease tolerance in coconut palm.

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Morphological Diversity among 18 Genitors of Vanuatu Tall (VTT) Coconut (Cocos nucifera L.) Population used in Crosses for Hybrids Resistant to Lethal Yellowing Disease Selection at Port-Bouët, Côte d’Ivoire

Cited by 4 publications

References 2 publications

Fruit morphological characteristics at different maturity stages of coconut (Cocos nucifera L.) improved hybrids (PB113+, PB121+) and their parent males (RIT+, WAT+)

Fruit morphological characteristics at different maturity stages of coconut (Cocos nucifera L.) improved hybrids (PB113+, PB121+) and their parent males (RIT+, WAT+)

Apport des descripteurs qualitatifs dans l’identification des accessions de cocotier Grand pour les programmes de régénération des collections au champ

Diversité agro-morphologique précoce d’hybrides d’autofécondation F3 de cocotier (<i>Cocos nucifera</i> L.) impliquant l’écotype Nain Vert Sri Lanka (NVS) tolérant à la maladie du Jaunissement Mortel

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