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 divergence among sunflower genotypes based on morphoagronomic traits in Parana State

    Juliana Parisotto Poletine1*, Cleber Daniel de Goes Maciel2, João Igor de Souza2,     Marco Antonio Aparecido Barelli3, Yara Camila Fabrin Cabral1, Verena Benício de Oliveira1 and Leonarda Grillo Neves3      
  1Universidade Estadual de Maringá, Departamento de Ciências Agronômicas, Avenida Colombo, no 5790 - CEP: 87020-900, Maringa, PR, Brasil. 2Programa de Pós-Graduação em Agronomia – UNICENTRO, CEDETEG, Rua Simeão Camargo Varela de Sá, 03 – CEP: 85040-080, Guarapuava, PR, Brasil. 3Universidade de Estado do Mato Grosso, Faculdade de Ciências Agro-Ambientais, Av. São João, s/nº, CEP 78200-000 Cáceres, MT, Brasil.
Email: [email protected]

  •  Accepted: 16 July 2012
  •  Published: 30 November 2012

Abstract

 

This work aimed to evaluate the genetic divergence among 16 sunflower hybrids. Experiment was developed in Umuarama County, Parana State, Brazil, in 2010/2011 cropping season. Experimental design used was randomized complete block with four replications. The characteristics evaluated were: Final stand, plant height, chapter curvature, chapter size, grain yield, weight of 1000 achene’s and oil content. Significant differences were detected for grain yield, chapter size and chapter curvature (1%). For final stand and oil content, significant differences (5%) was observed, suggesting that evaluated characters are important for genetic divergence characterization. Based on Mahalanobis Generalized Distance it was established that genetic dissimilarity measures, SULFOSOL and SYN 045 genotypes were the most dissimilar with D2ii’ of 134.54%. Clustering by Tocher method by using D2ii, divided hybrids into two groups. Grain yield and chapter size contributed significantly in genetic divergence observed between hybrids and it was possible to identify divergent genetic materials for obtaining lines and/or formation of new populations.

 

Key words: Genetic variability, plant breeding, Helianthus annuus L., D2ii' analysis.