Variabilidade genética de etnovariedades de mandioca, avaliada por marcadores de DNA
TLDR
The objective of this work was to quantify the genetic diversity among cassava folk varieties as well as to examine the distribution of the genetic Diversity among varieties of different origin and type.Abstract:
The objective of this work was to quantify the genetic diversity among cassava folk varieties as well as to examine the distribution of the genetic diversity among varieties of different origin and type. Fifty-four cassava varieties were chosen from 4 Brasilian regions: 45 of the Amazon basin (23 from River Negro, 6 of the River Branco and 16 of the River Solimoes) and 9 of the south coast of the Sao Paulo State, Brazil. The modern variety Mantiqueira was also included as a reference. Among these, 38 were bitter varieties and 17 sweet. Three different types of DNA markers were used: RAPD (randomly amplified polymorphic DNA), AFLP (amplified fragment length polymorphism) and microsatellites. Analysis of the results consisted of a description of band patterns, a calculation of similarity indexes (Nei & Li) and a principal coordinate analysis (PCoA) for each marker type. Heterozygosity, diversity indexes (DI, Weir) and genetic differentiation coefficients (GST) were calculated for the microsatellite loci.Genetic variability was more concentrated within regions, then among regions (GST = 0.07). Mean heterozygosity was 56%. Mean similarity indexes were dependent on the marker used: S = 0.89 for RAPD, S = 0.85 for AFLP and S = 0.59 for microsatellites. PCoA analysis revealed groups, distinguishing bitter from sweet varieties.read more
Citations
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Genetic Data Analysis
TL;DR: The objectives of BIOS 781 are to present basic population and quantitative genetic principles, including classical genetics, chromosomal theory of inheritance, and meiotic recombination, and methods for genome-wide association and stratification control.
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Origin and domestication of native Amazonian crops.
R. Charles Clément,Michelly de Cristo-Araújo,Géo Coppens D'Eeckenbrugge,Allessandro Alves Pereira,Doriane Picanço-Rodrigues +4 more
TL;DR: Emergent patterns include the relationships among domestication, antiquity, origin in the periphery, ample pre-Columbian dispersal and clear phylogeographic population structure for manioc, pineapple, peach palm and, perhaps, Capsicum peppers.
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The Amazonian Formative: Crop Domestication and Anthropogenic Soils
TL;DR: It is argued that properties of two different types of soils, terras pretas and terras mulatas, support their interpretation as correlates of, respectively, past settlement areas and fields where spatially-intensive, organic amendment-reliant cultivation took place.
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Genetic Diversity of Traditional South American Landraces of Cassava (Manihot Esculenta Crantz): An Analysis Using Microsatellites
TL;DR: The results showed that traditional landraces of sweet and bitter cassava form an important source of genetic diversity and merit more attention from managers of crop genetic resources.
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Slash-burn-and-churn: Landscape history and crop cultivation in pre-Columbian Amazonia
TL;DR: This article reviewed the role that slash-and-burn cultivation has had in discussions about pre-Columbian Amazonia, discusses how this account has been modified by recent research on pre-colonized anthropogenic soils, and queries the extent to which the regionally-heterogeneous timing of crop domestication and cultivation may have influenced the fire history of precolonised Amazonia.
References
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