Variability and selection for morphological bean traits in wild cocoa trees (Theobroma cacao L.) from French Guiana

Lachenaud, Philippe; Oliver, G. C.

doi:10.1007/s10722-004-4005-z

Cited by 20 publications

(7 citation statements)

References 6 publications

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“…The usefulness of cluster analysis in grouping germplasm collection based on similar morphological variations as in the present study has been demonstrated in C. canephora (Aluka, 2013;Anim-Kwapong et al, 2011a), C. arabica (Gessese et al, 2015;Kebede and Bellachew, 2008;Montagnon and Bouharmont, 1996), and many other crop plants, such as cocoa (Aikpokpodion, 2010;Lachenaud and Oliver, 2005) sorghum (Ayana and Bekele, 1999), and rice (Arietta-Espinoza et al, 2005). The cluster analysis allowed for a successful grouping of the Robusta coffee genotypes into five main groups based on the similarity of 13 quantitative characters.…”

Section: Discussionsupporting

confidence: 62%

Assessment of Genetic Diversity in Robusta Coffee Using Morphological Characters

Akpertey

Anim-Kwapong

Ofori

2018

International Journal of Fruit Science

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Assessing the level of genetic variation that exist in any breeding population is important as this has significant implications for selection and variety development. The objectives of the present study were to determine the variation among 71 Robusta coffee genotypes based on 21 traits and to determine the genetic relationships between the genotypes. The 71 genotypes were established in 2013 as clones raised from single node cuttings and planted in a randomized complete block design with four blocks, with five plants per genotype per block. There was variation in all the traits assessed for the different Robusta coffee genotypes as evidenced by the coefficient of variation and frequencies of the quantitative and qualitative traits, respectively. Principal Component Analysis (PCA) was performed to obtain information on the relative importance of the morphological characters assessed, and cluster analysis was used to determine relationships among the genotypes evaluated. The first and second principal components accounted for 39.2% and 18.9% of the total variability, respectively. PCA revealed that height, stem diameter, span, number of laterals per tree, diameter of laterals, and number of nodes per lateral were the principal characters to discriminate the Robusta coffee genotypes examined. Cluster analysis grouped the Robusta coffee genotypes into five clusters as revealed by the dendrogram. The diversity among the Robusta coffee genotypes in both quantitative and qualitative traits revealed by this study can be used for trait improvement through selection and hybridization.

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Section: Discussionsupporting

confidence: 62%

Assessment of Genetic Diversity in Robusta Coffee Using Morphological Characters

Akpertey

Anim-Kwapong

Ofori

2018

International Journal of Fruit Science

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“…The least number of fresh beans pod -1 was recorded in genotype VTLC 1 (22.09). Similar findings on the variation of the number of beans pod -1 among different cocoa genotypes of different genetic origin were reported (Enriquez and Soria, 1968;Lachenaud and Oliver, 2005). In the present study, pods with more than 30 beans were observed in four genotypes viz., VTLCH 4 (30.33), VTLC 66 (30.38), VTLC 11 (32.07) and VTLC 19 (34.06).…”

Section: Pod and Bean Characters Of Cocoa Genotypessupporting

confidence: 91%

Early performance of cocoa (Theobroma cacao L.)genotypes in arecanut under Assam condition of North Eastregion of India

Singh

Uchoi

Acharya

et al. 2021

JPC

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Cocoa is an important plantation crop grown in southern parts of India. Though many cocoa varieties have been released for cultivation in different parts of India, there is no variety recommended for cultivation exclusively for India’s North East region, especially Assam, where arecanut is grown as an important cash crop. Therefore the present investigation was undertaken to study the performance of twelve cocoa genotypes for its growth, pod yield and yield attributing traits for subsequent research programmes. The data for growth, pod yield and yield attributing traits were recorded three years after planting for five years (2015 to 2019), and the mean data were used for analysis. Genotype VTLC 11 significantly produced greater plant height (2.70 m), stem circumference (27.73 cm), height at jorquetting (36.16 cm) and canopy area (17.00 m2). Mean average pod yield among the genotypes varied from 20.65 to 48.40 tree-1 year-1. Genotype VTLC 19 produced significantly higher pod yield (48.40), number of fresh beans pod-1 (34.06), fresh bean weight pod-1 (229.65 g), dry bean weight pod-1 (119.32 g), single dry bean weight (1.20 g) and dry bean yield (1.76 kg). Considering the most economic traits of cocoa, VTLC 19 appears to be the most suitable genotype for commercial cultivation in the region.

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“… and the result was in tune with earlier workers[45,19]. High GCV value for single pod weight (59.38 %), wet bean weight per pod (51.13%), number of beans per pod (23.65%), single dry bean weight (41.38%), wet bean weight per plant per year (68.47%) dry bean weight per plant per year (70.artificial media.…”

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confidence: 88%

Phenotyping of Vascular Streak Dieback Disease (Vsd) Resistant Cocoa Hybrids and Endorsement of Resistant Gene in Auspicious Genotype by Employing Molecular Marker Systems

Minimol¹,

Suma²,

Jayasree³

et al. 2018

BIOP

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Cocoa (Theobroma cacao L.) is native to humid tropical region of Central America and considered as important agro forestry tree species. Vascular streak dieback (VSD), a devastating disease with distinct symptoms of dieback, is one of the major threats for cocoa cultivation. Th e confounding part of this disease is that chemicals have little effect on disease control. The most tenable and economic technique to tackle this disease is by evolving resistant materials. When this disease began to assume unmanageable magnitudes in India, Kerala Agricultural University had initiated VSD resistant breeding since 1995. Initially, 566 hybrids which expressed tolerance in the nursery for two years were field established. After fifteen years of field screening, 46 hybrids which manifested field resistance were selected for further study. Examination on self-incompatibility position exhibited that majority of them (37) were self incompatible. When yield contributing characters were accessed VSD I 31.8 was found to be superior and out rated the checks, most popular varieties available. Disease resistance was further confirmed by budding and molecular markers.VSD I 31.8 (CCRP 15) can be consider as a novel hybrid released in the world with VSD resistance and considerable yield.

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Variability and selection for morphological bean traits in wild cocoa trees (Theobroma cacao L.) from French Guiana

Cited by 20 publications

References 6 publications

Assessment of Genetic Diversity in Robusta Coffee Using Morphological Characters

Assessment of Genetic Diversity in Robusta Coffee Using Morphological Characters

Early performance of cocoa (Theobroma cacao L.)genotypes in arecanut under Assam condition of North Eastregion of India

Phenotyping of Vascular Streak Dieback Disease (Vsd) Resistant Cocoa Hybrids and Endorsement of Resistant Gene in Auspicious Genotype by Employing Molecular Marker Systems

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