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

Repeatability analysis on morphological descriptors in the early stages of development

Santos Henrique Brant Dias
  • Santos Henrique Brant Dias
  • Departamento de Engenharia Agrícola, Universidade Federal de Viçosa – UFV, CEP 36570-900, Viçosa – MG, Brasil.
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Francisco Charles dos Santos Silva
  • Francisco Charles dos Santos Silva
  • Departamento de Engenharia Agrícola, Universidade Federal de Viçosa – UFV, CEP 36570-900, Viçosa – MG, Brasil.
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Fabíola dos Santos Dias
  • Fabíola dos Santos Dias
  • Departamento de Fitotecnia, Universidade Federal de Viçosa – UFV, CEP 36570-900, Viçosa – MG, Brasil.
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Ronaldo Silva Gomes
  • Ronaldo Silva Gomes
  • Departamento de Genética e Melhoramento, Universidade Federal de Viçosa – UFV, CEP 36570-900, Viçosa – MG, Brasil.
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Edcássio Dias Araújo
  • Edcássio Dias Araújo
  • Departamento de Engenharia Agrícola, Universidade Federal de Viçosa – UFV, CEP 36570-900, Viçosa – MG, Brasil.
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Gemima Santos Arcanjo
  • Gemima Santos Arcanjo
  • Departamento de Engenharia Civil, Universidade Federal de Viçosa – UFV, CEP 36570-900, Viçosa – MG, Brasil.
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Francielle de Matos Feitosa
  • Francielle de Matos Feitosa
  • Departamento de Genética e Melhoramento, Universidade Federal de Viçosa – UFV, CEP 36570-900, Viçosa – MG, Brasil.
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Élvis da Silva Alves
  • Élvis da Silva Alves
  • Departamento de Engenharia Agrícola, Universidade Federal de Viçosa – UFV, CEP 36570-900, Viçosa – MG, Brasil.
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Jannaylton Éverton Oliveira Santos
  • Jannaylton Éverton Oliveira Santos
  • Departamento de Engenharia Agrícola, Universidade Federal de Viçosa – UFV, CEP 36570-900, Viçosa – MG, Brasil.
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Fernando França da Cunha
  • Fernando França da Cunha
  • Departamento de Engenharia Agrícola, Universidade Federal de Viçosa – UFV, CEP 36570-900, Viçosa – MG, Brasil.
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  •  Received: 11 April 2017
  •  Accepted: 20 June 2017
  •  Published: 27 July 2017

Abstract

The insufficiency of morphological descriptors reveals the importance of studies related to this topic for the genetic improvement of soybean, with attention to the possible descriptors measured in early stages of plant development which allows obtaining fast results. The aim of this work was to estimate the coefficient of repeatability of some morphological descriptors in the early stages of development of soybean and the minimum number of evaluations necessary to predict the real value of genotypes. Five (5) experiments were carried out with 124, 93, 90, 16 and 16 genotypes of soybean for the first, second, third, fourth, and fifth experiment, respectively, with characteristics combined at the stage V3. It was concluded that the length of the first internode requires fewer measurements compared to other measured characteristics. With six measurements, it was possible to obtain 95% and 90% reliability for plant height in V3 and first internode length, respectively, by the methods ANOVA, CP (correl), CP(cov) and AE(correl). With seven measurements, it was obtained 90% reliability for the epicotyl length for all methods used; 85% for the petiole length of unifoliate leaf by method of CP(cov) and 90% by methods ANOVA, CP(correl), AE(correl). With 15 measurements, it was possible to obtain 90% reliability for the hypocotyl length, petiole length of trifoliate leaf and the angle formed by the insertion of the petioles of the unifoliate leaf for all methods used; and, for the rachis length of the first trifoliate leaf, 37 measurements would be necessary for reliability of 90% by methods of ANOVA, CP(correl), CP(cov) and AE(correl).

Key words: Glycine max (L.), soybean breeding, number of evaluation, stability.