A nonparametric approach to selection popcorn hybrids to resistance to foliar diseases

Autores

  • Rafael Augusto Vieira Universidade Estadual de Maringá
  • Carlos Alberto Scapim Universidade Estadual de Maringá
  • Dauri José Tessmann Universidade Estadual de Maringá
  • Fernando Rafael Alves Ferreira Universidade Estadual de Maringá
  • Marcelo Vivas Universidade Estadual do Norte Fluminense Darcy Ribeiro
  • Antonio Teixiera do Amaral Júnior Universidade Estadual do Norte Fluminense Darcy Ribeiro

DOI:

https://doi.org/10.15361/1984-5529.2016v44n2p165-169

Resumo

The northern leaf blight (NLB) (Exserohilum turcicum) and gray leaf spot (GLS) (Cercospora zeae-maydis) are two major foliar diseases affecting maize. Losses caused by these diseases are up to 65%, and genetic resistance is widely employed. In the present study, the genetic resistance levels of popcorn hybrids to NLB and GLS determined with a nonparametric statistical approach using the Kruskal-Wallis and Wilcoxon tests, which also allowed to estimate the genetic advancement values (AdV) for these hybrids. For this, an experi­ment in incomplete randomized block design was carried out in 2007/2008 cropping season and the area under the disease progress curve for NLB and GLS were estimated based on severity. The effect of hybrids was significant (P < 0.10) for resistance to NLB and GLS. All the 42 tested hybrids were resistant to NLB and eight of them were moderately susceptible to GLS. Eight hybrids had outstanding AdV and these materials are able to advance to subsequent stages of the breeding program without restrictions.

 

Additional keywords: Cercospora zeae-maydis; Exserohilum turcicum; selection; Zea mays.

Biografia do Autor

Rafael Augusto Vieira, Universidade Estadual de Maringá

Departamento de Agronomia

Carlos Alberto Scapim, Universidade Estadual de Maringá

Departamento de Agronomia

Dauri José Tessmann, Universidade Estadual de Maringá

Departamento de Agronomia

Fernando Rafael Alves Ferreira, Universidade Estadual de Maringá

Departamento de Agronomia

Marcelo Vivas, Universidade Estadual do Norte Fluminense Darcy Ribeiro

Laboratório de Melhoramento Genético Vegetal, Centro de Ciências e Tecnologias Agropecuárias

Antonio Teixiera do Amaral Júnior, Universidade Estadual do Norte Fluminense Darcy Ribeiro

Laboratório de Melhoramento Genético Vegetal, Centro de Ciências e Tecnologias Agropecuárias

Publicado

30/03/2016

Edição

Seção

Fitossanidade - Crop Protection