Molecular characterization of 'sweet' cassavas (Manihot esculenta) from a germplasm bank in Brazilian Eastern Amazonia

Cunha, E. F. M.; Silva, Carlos Rogério de Sousa; Albuquerque, Paulo; Ramalho, G. F.; Pontes, Lígia Cristine Gonçalves; Neto, J. T. de Farias

doi:10.1590/1984-70332016v16n1a5

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“…These values of heterozygosity, as average of alleles, were similar to those found in studies with cassava accessions from Pará, Amapá and Amazonas states, that found values from 0.55 to 0.71 (MOURA et al, 2013;MOURA-CUNHA et al, 2016;SILVA et al, 2016;SOUSA et al, 2017). However, the heterozygosity levels were higher than those found in studies carried out with germplasm banks from the Southeast and Southern regions of Brazil, which detected values from 0.26 to 0.47 (SIQUEIRA et al, 2009;SIQUEIRA et al, 2010;ORTIZ et al, 2016).…”

Section: Resultssupporting

confidence: 86%

Molecular characterization and core collection evaluation of Manihot esculenta Crantz

et al. 2020

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Cassava is one of the most important subsistence crops in tropical regions. It is necessary to preserve and to know the genetic diversity existent for the adequate use of genetic resources. The evaluation of genetic diversity among genotypes results in information about potential parents in breeding programs, allows duplicates identification, and facilitates germplasm exchange between research institutions. The objective of this study was to characterize the genetic diversity of cassava accessions of North Brazil region. A total of 106 accessions were analyzed using ten microsatellite markers. The genetic parameters estimated were: expected heterozygosity (HE), observed heterozygosity (HO) and polymorphic information content (PIC). Clustering was performed using the UPGMA and Neighbor-Joining (NJ) method. Bayesian analysis, analysis of principal coordinates and identification of a core collection were also used. The ten loci amplified 8,40 alleles on average. The average heterozygosity estimates were: HE = 0.71, HO = 0.58 and PIC = 0.72. Genetic distances ranged from 0.158 to 0.908. Six (5,66%) accesses were redundant. Clustering and dispersion analysis didn’t differentiate bitter from sweet cassava, and there wasn’t correlation between groups and collect origin. The core collection consisted of 22 individuals that represented 94% of total allelic diversity and 20,75% of the base collection. The results indicate high dissimilarity between the accessions and allowed the detection of redundant genotypes, showing the use of genetic markers as informative tools for the management of collections.

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Section: Resultssupporting

confidence: 86%

Molecular characterization and core collection evaluation of Manihot esculenta Crantz

et al. 2020

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Molecular characterization of 'sweet' cassavas (Manihot esculenta) from a germplasm bank in Brazilian Eastern Amazonia

Abstract: -Genetic variability of a set of 81 accessions of 'sweet' cassavas (Manihot

Cited by 1 publication

References 30 publications

Molecular characterization and core collection evaluation of Manihot esculenta Crantz

Molecular characterization and core collection evaluation of Manihot esculenta Crantz

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