GENETIC DIVERSITY OF CASSAVA (Manihot esculenta Crantz), (EUPHORBIACEAE) GROWN IN THREE AGROCLIMATIC ZONES OF CENTRAL AFRICAN REPUBLIC

2015 ◽  
Vol 4 (3) ◽  
pp. 438-449
Author(s):  
Innocent Zinga ◽  
Kosh Komba E ◽  
Duval M F ◽  
Akpavi S ◽  
Atato A ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Manihot Esculenta ◽  
Central African Republic ◽  
Staple Food ◽  
Manihot Esculenta Crantz ◽  
Peasant Communities ◽  
Agroclimatic Zones

Cassava (Manihot esculenta Krants) introduced in the Central African Republic (CAR) in the 1850s, is now the staple food of the population. It does not know the genetic diversity of cultivated accessions in peasant communities. To assess this diversity, microsatellite technique was used on the 179 accessions identified. 137 alleles were amplified with an average of 5.95 alleles at the 23 loci. Analysis of genetic diversity within varieties across five villages showed that 46 accessions of 49 have a genotypic homogeneity is 93.87%. Only accessions "Tokonenanga" (Ndanga) "Touguenlag" (Soungbe) and "Sereka" (Karama) are each represented by two different genotypes.

scholarly journals Genetic Diversity of Cassava (Manihot esculenta Crantz) in Ecuador by Using SSR Markers

2021 ◽  
Author(s):  
Nelly Paredes ◽  
Valeria Alulema ◽  
Luis Lima ◽  
Marten Sørensen ◽  
and Álvaro Monteros-Altamirano
Keyword(s):  
Genetic Diversity ◽  
Manihot Esculenta ◽  
Staple Food ◽  
Ethnic Communities ◽  
Manihot Esculenta Crantz ◽  
Wide Range ◽  
Ssr Primers ◽  
Amazonian Region

Cassava (Manihot esculenta Crantz), domesticated in the Amazonian region of South America, presents an important diversity in Ecuador, where it is a main staple food; however, only few Ecuadorian cassava accessions have been included in international molecular assessments. The purpose of this study was to apply suitable cassava mi-crosatellites to characterize the genetic variability of the Ecuadorian cassava collection composed mainly of local landraces from the Coast, Andes and Amazonia regions. The use of microsatellite markers allowed the determination of the genetic diversity of the collection. Seven selected SSR primers, permitted to identify homozygous and hetero-zygous materials within the cassava collection of 133 accessions. The loci presented an average genetic diversity value of 0.7 and an average PIC value of 0.67, which is con-sidered high. Low number of duplicates (8.8%) were identified in the Ecuadorian col-lection which is not fully duplicated at CIAT. Currently, a wide range of cassava diver-sity is still cultivated in multi-crop agro-ecosystem, mainly in the Coast and Amazo-nian regions. Especially in the Amazonian region, due to important cultural uses of cassava by local ethnic communities, more in depth studies in the region could unveil the genetic diversity present in situ today.

ANALYSIS OF GENETIC DIVERSITY OF 26 CASSAVA VARIETIES (Manihot esculenta CRANTZ) WITH DIFFERENT RESPONSES TO WATERLOGGING CONDITIONS BY USING RAPD MARKERS

2021 ◽  
Vol 66 (3) ◽  
pp. 170-179
Author(s):  
Sengsoulichan Dethvongsa ◽  
Vu Nguyen Anh ◽  
Van Tran Khanh
Keyword(s):  
Genetic Diversity ◽  
Phylogenetic Tree ◽  
Manihot Esculenta ◽  
Rapd Markers ◽  
Flood Tolerance ◽  
Randomly Amplified Polymorphic Dna ◽  
Manihot Esculenta Crantz ◽  
Rapd Pcr ◽  
Cassava Production ◽  
Cassava Varieties

RAPD (Randomly Amplified Polymorphic DNA) is an indicator for high and stable polymorphism, widely used in the study of the diversity of cassava. In this paper, the results of using 20 polymorphic primers OPK combined with the establishment of the phylogenetic tree to analyze the genetic diversity of 26 cassava varieties with different responses to waterlogging conditions by using the RAPD-PCR technique were presented. The purpose of this experiment was to show the genetic relevance of the studied cassava varieties. The results showed that the flood tolerance of cassava was not related to the polymorphism and branching characteristics of the stem. This information may be use as a basis for selecting flood-tolerant cassava varieties for cassava production, as well as the basis for selecting genetically different parents for breeding.

scholarly journals Starch and flour extraction and nutrient composition of tuber in seven cassava accessions

2013 ◽  
Vol 10 (2) ◽  
pp. 217-222 ◽  
Author(s):  
MSA Fakir ◽  
M Jannat ◽  
MG Mostafa ◽  
H Seal
Keyword(s):  
Hydrogen Cyanide ◽  
Manihot Esculenta ◽  
Crude Protein ◽  
Dry Matter ◽  
Raw Materials ◽  
Starch Content ◽  
Staple Food ◽  
Manihot Esculenta Crantz ◽  
Crude Fiber Content ◽  
Cassava Plant

Cassava (Manihot esculenta Crantz) roots (tubers) are used as staple food. Starch extracted from tubers is widely utilized as raw materials in industries. Dry matter (DM) content, starch and flour extraction and proximate composition were investigated in seven cassava accessions (Coc-A1, Kh-A2, Cow-A3, Sa-A4, Me-A5, Va-A6 and Sy-A8.) in 2010- 2011. Leaf DM varied from 20.51% in Me-A5 to 29.01% in Sy-A8; that of stem from 27.24% in Va-A6 to 32.10% (average of Sy-A8, Me-A5 and Sa-A4); and that of tuber from 37.30% in Kh-A2 to 45.26% in Sy-A8. Starch was extracted by blending chopped tuber followed by decantation. Tubers were sliced, sun dried and milled into flour. Tuber starch content (fresh wt. basis) varied between 15.04% in Sy-A8 and 24.97% (average of Coc-A1 and Me-A5); that of peel from 4.54% in Va-A6 to 5.85% in Coc-A1. Crude protein varied from 1.80% (average of Kh-A2, Cow-A3 and Sy-A8) to 4.53% in Va-A6. Crude fiber content varied from 1.95% (average of Sa-A4 and Coc-A1) to 4.27% in Cow-A3. Cyanogens present in cassava plant escape as hydrogen cyanide (HCN) during harvesting and processing. Variation for HCN existed and it was 140.95 mg/kg fresh tuber (average of Sy-A8 and Coc-A1) to 546.0 mg/kg fresh tuber in Va-A6. There was no detectable HCN in the extracted flour and starch. It may be concluded that genetic variation for DM, starch, protein and HCN existed in seven cassava accessions, and Coc-A1 may be a better one due to its lower HCN, higher DM and starch content. DOI: http://dx.doi.org/10.3329/jbau.v10i2.14698 J. Bangladesh Agril. Univ. 10(2): 217-222, 2012

scholarly journals Manihot esculenta (Crantz)’ Diversity Management by Peaysants in Pissa and Damara’s Districts in the Central African Republic (A Comparative Approach)

2021 ◽  
Vol 5 (5) ◽  
pp. 07-21
Author(s):  
Gougodo De Mon-Zoni Julie Léancy ◽  
Kosh-Komba E ◽  
Bombo- Yongo ◽  
Zaman M ◽  
Touckia GI ◽  
...  
Keyword(s):  
Manihot Esculenta ◽  
Central African Republic ◽  
Diversity Management ◽  
Comparative Approach ◽  
Manihot Esculenta Crantz

scholarly journals Genetic Diversity of Cassava (Manihot esculenta Crantz) Genotypes in Ethiopia

2013 ◽  
Vol 3 (9) ◽  
pp. 636-642 ◽  
Author(s):  
Mulualem Tewodros ◽  
◽  
WeldeMichael Getachew ◽  
Benti Tadesse ◽  
Walle Tesfaye ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Manihot Esculenta ◽  
Manihot Esculenta Crantz

scholarly journals Selective signatures and high genome-wide diversity in traditional Brazilian manioc (Manihot esculenta Crantz) varieties

2021 ◽  
Author(s):  
Alessandro Alves-Pereira ◽  
Maria Imaculada Zucchi ◽  
Charles R. Clement ◽  
João Paulo Gomes Viana ◽  
José Baldin Pinheiro ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Genetic Resources ◽  
Manihot Esculenta ◽  
Evolutionary Dynamics ◽  
Raw Material ◽  
Nucleotide Polymorphisms ◽  
Manihot Esculenta Crantz ◽  
Genome Wide ◽  
Neutral Genetic Diversity ◽  
Effective Use

Knowledge about crops' genetic diversity is essential to promote effective use and conservation of their genetic resources, because genetic diversity enables farmers to adapt their crops to specific needs and is the raw material for breeding efforts. Currently, manioc (Manihot esculenta ssp. esculenta) is one of the most important food crops in the world and has the potential to help achieve food security in the context of on-going climate changes. In this study we assessed the patterns of genome-wide diversity of traditional Brazilian manioc varieties conserved in the gene bank of the Luiz de Queiroz College of Agriculture, University of São Paulo. We used single nucleotide polymorphisms to evaluate the organization of genetic diversity and to identify selective signatures contrasting varieties from different biomes with samples of manioc's wild relative M. esculenta ssp. flabellifolia. We identified signatures of selection putatively associated with resistance genes, plant development and response to abiotic stresses. This presumed adaptive variation might have been important for the initial domestication and for the crop's diversification in response to cultivation in different environments. The neutral variation revealed high levels of genetic diversity within groups of varieties from different biomes and low to moderate genetic divergence among biomes. These results reflect the complexity of manioc's biology and its evolutionary dynamics under traditional cultivation. Our results exemplify how the smallholder practices contribute to the conservation of manioc's genetic resources, maintaining variation of potential adaptive significance and high levels of neutral genetic diversity.

scholarly journals Corrin-based chemosensors for the ASSURED detection of endogenous cyanide

2015 ◽  
Vol 13 (1) ◽  
pp. 14-17 ◽  
Author(s):  
Felix Zelder ◽  
Lucas Tivana
Keyword(s):  
South America ◽  
Manihot Esculenta ◽  
Staple Food ◽  
Manihot Esculenta Crantz

Cassava (Manihot esculenta Crantz) is a staple food for more than 500 million people, especially in Africa and South America.

Genetic Diversity of Traditional South American Landraces of Cassava (Manihot Esculenta Crantz): An Analysis Using Microsatellites

2004 ◽  
Vol 58 (2) ◽  
pp. 242-256 ◽  
Author(s):  
Marianne Elias ◽  
Gilda Santos Mühlen ◽  
Doyle McKey ◽  
Ana Carolina Roa ◽  
Joe Tohme
Keyword(s):  
Genetic Diversity ◽  
Manihot Esculenta ◽  
South American ◽  
Manihot Esculenta Crantz

scholarly journals Genetic diversity characterization of cassava cultivars (Manihot esculenta Crantz).: I) RAPD markers

1998 ◽  
Vol 21 (1) ◽  
pp. 105-113 ◽  
Author(s):  
Carlos Colombo ◽  
Gérard Second ◽  
Tereza Losada Valle ◽  
André Charrier
Keyword(s):  
Genetic Diversity ◽  
Multivariate Analysis ◽  
Genetic Variability ◽  
Manihot Esculenta ◽  
Core Collection ◽  
Rapd Markers ◽  
Manihot Esculenta Crantz ◽  
Important Resource ◽  
Flour Production

RAPD markers were used to investigate the genetic diversity of 31 Brazilian cassava clones. The results were compared with the genetic diversity revealed by botanical descriptors. Both sets of variates revealed identical relationships among the cultivars. Multivariate analysis of genetic similarities placed genotypes destinated for consumption "in nature" in one group, and cultivars useful for flour production in another. Brazil’s abundance of landraces presents a broad dispersion and is consequently an important resource of genetic variability. The botanical descriptors were not able to differentiate thirteen pairs of cultivars compared two-by-two, while only one was not differentiated by RAPD markers. These results showed the power of RAPD markers over botanical descriptors in studying genetic diversity, identifying duplicates, as well as validating, or improving a core collection. The latter is particularly important in this vegetatively propagated crop.

Enzymatic polymorphism of genetic diversity in cassava (Manihot esculenta Crantz) accessions in Côte d’Ivoire

2015 ◽  
Vol 2 (1) ◽  
pp. 009-017
Author(s):  
Kouablan Edmond Koffi ◽  
◽  
Kouassi Guy Brou ◽  
Kan Modeste Koussi ◽  
Ahou-yah Gisèle Koua ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Cote D'ivoire ◽  
Manihot Esculenta ◽  
Côte D’Ivoire ◽  
Manihot Esculenta Crantz ◽  
Cote D’Ivoire ◽  
Côte D'ivoire
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