African Journal of
Agricultural Research

  • Abbreviation: Afr. J. Agric. Res.
  • Language: English
  • ISSN: 1991-637X
  • DOI: 10.5897/AJAR
  • Start Year: 2006
  • Published Articles: 6576

Full Length Research Paper

Genetic diversity in sweet cassava from the Brazilian Middle North Region and selection of genotypes based on morpho-agronomical descriptors

Ronaldo Silva Gomes*
  • Ronaldo Silva Gomes*
  • Graduation Program on Genetic and Breeding, Federal University of Viçosa, Viçosa-MG, Brazil.
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Cleverson Freitas de Almeida
  • Cleverson Freitas de Almeida
  • Graduation Program on Genetic and Breeding, Federal University of Viçosa, Viçosa-MG, Brazil.
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Jose Roneilson da Silva Costa
  • Jose Roneilson da Silva Costa
  • Graduation Program on Genetic and Crop Breeding, Federal Rural University of Pernambuco, Recife-PE, Brazil.
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Ronaldo Machado Junior
  • Ronaldo Machado Junior
  • Graduation Program on Plant Science, Federal University of Viçosa, Viçosa-MG, Brazil.
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Fabio Teixeira Delazari
  • Fabio Teixeira Delazari
  • Graduation Program on Plant Science, Federal University of Viçosa, Viçosa-MG, Brazil.
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Francisco Charles da Silva Santos3
  • Francisco Charles da Silva Santos3
  • Graduation Program on Plant Science, Federal University of Viçosa, Viçosa-MG, Brazil.
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Derly Jose Henriques da Silva
  • Derly Jose Henriques da Silva
  • Graduation Program on Plant Science, Federal University of Viçosa, Viçosa-MG, Brazil.
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  •  Received: 29 May 2016
  •  Accepted: 17 August 2016
  •  Published: 22 September 2016

Abstract

This work had as objective the morpho-agronomic characterization of germplasm of cassava (Manhiot esculenta Crantz) from the Brazilian Region Middle North and the selection of genotypes. The germplasm collection was carried out in autochthonous fields. 10 genotypes of which, 8 were ethno-varieties and 2 modern varieties (BRS Dourada and BRS Gema de Ovo), were collected. A completely randomized blocks design was used and the experiment was carried out in January of 2013 in Chapadinha-MA, Brazil. The morphological and agronomical characterizations were carried out at eight months after planting and at the harvesting time, respectively. The frequency of genotypes in each descriptor class and the entropy level for each descriptor were calculated. There was high phenotypic difference in the germplasm for most of the characters evaluated. Lowest entropy levels corresponded to the descriptors sinuosity of foliar lobe, margins of stipules, pubescence of apical bud, growing habit and color of stem epidermis. Highest entropy and consequently higher variability were noticed in petiole color, color of stem cortex, plant kind and peduncle presence. The genotypes Rampa and Turiaçu have higher productive and marketing value, thus are excellent alternatives for adoption and cultivation in the Middle North Region. The work proved to be a prominent approach in the screening and selection of promising and contrasting cassava genotypes. Cassava genetic resources occurring in the Brazilian Middle North Region represent a valuable resource in breeding programs of this crop.

Key words: Characterization, genotypes selection, M. esculenta.