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Diallel analysis of resistance to Fusarium ear rot in Brazilian popcorn genotypes

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Abstract

Among the ear rot pathogens, species of Fusarium cause significant economic losses to popcorn production. To generate popcorn genotypes resistant to Fusarium ear rot, the combining ability of popcorn lines in diallel crosses were assessed during two cropping years: the first from Mar to Sep 2015 and the second from Sep 2015 to Jan 2016. The traits analyzed were: average ear weight (AEW, kg ha−1); grain yield (GY, kg ha−1); popping expansion (PE, g mL−1), Fusarium incidence on ears (EIFU, %); Fusarium ear rot severity index (FSI, %), percentage of fungal-infected kernels (KIF), and percentage of Fusarium-infected kernels (KIFU). Non-additive genetic effects prevailed in the expression of resistance to Fusarium ear rot and grain yield, while additive effects were the most prominent in the expression of popping expansion. Among 56 hybrids, seven showed outstanding grain yield, desirable popping expansion, and resistance to Fusarium ear rot. The less susceptible hybrids to ear rot produced high grain yield and popping expansion. Two disease-related traits, KIFu and EIFu, allowed to best differentiate among the genotypes.

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Acknowledgements

The authors thank Universidade Estadual do Norte Fluminense Darcy Ribeiro – UENF for the facilities; Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro (FAPERJ) and Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) for the financial support; and Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) for a MSc. scholarship for the first author.

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Authors and Affiliations

  1. Universidade Estadual do Norte Fluminense Darcy Ribeiro (UENF), 28013-602, Campos dos Goytacazes, RJ, Brazil

    Ismael Albino Schwantes, Antonio Teixeira do Amaral Júnior, Ismael Fernando Schegoscheski Gerhardt, Marcelo Vivas, Fernando Higino de Lima e Silva & Samuel Henrique Kamphorst

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  1. Ismael Albino Schwantes
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  2. Antonio Teixeira do Amaral Júnior
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  3. Ismael Fernando Schegoscheski Gerhardt
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  4. Marcelo Vivas
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  5. Fernando Higino de Lima e Silva
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  6. Samuel Henrique Kamphorst
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Correspondence to Ismael Albino Schwantes.

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Section Editor: Adalberto Café Filho

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Schwantes, I.A., do Amaral Júnior, A.T., Gerhardt, I.F.S. et al. Diallel analysis of resistance to Fusarium ear rot in Brazilian popcorn genotypes. Trop. plant pathol. 42, 70–75 (2017). https://doi.org/10.1007/s40858-017-0136-6

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