Popcorn genotypes resistance to fall armyworm/Genotipos de milho pipoca resistentes a lagarta-do-cartucho

• Published in: Ciência rural 2018-02, Vol.48 (2)
• Main Authors: de Oliveira, Nadia Cristina, Suzukawa, Andreia Kazumi, Pereira, Carolina Bertuzzi, Santos, Hayssa Vilela, Hanel, Aldo, de Albuquerque, Fernando Alves, Scapim, Carlos Alberto
• Format: Article
• Language: English
• ISSN: 0103-8478
• DOI: 10.1590/0103-8478cr20170378

The aim of this study was to evaluate popcorn genotypes for resistance to the fall armyworm, Spodoptera frugiperda. The experiment used a completely randomized design with 30 replicates. The popcorn genotypes Aelton, Arzm 05 083, Beija- Flor, Colombiana, Composto Chico, Composto Gaucha, Marcia, Mateus, Ufvm Barao Vicosa, Vanin, and Viviane were evaluated, along with the common maize variety Zapalote Chico. Newly hatched fall armyworm larvae were individually assessed with regard to biological development and consumption of food. The data were subjected to multivariate analyses of variance and genetic divergence among genotypes was evaluated through the clustering methods of Tocher based on generalized Mahalanobis distances and canonical variable analyses. Seven popcorn genotypes, namely, Aelton, Arzm 05 083, Composto Chico, Composto Gaucha, Marcia, Mateus, and Viviane, were shown to form a cluster (cluster I) that had antibiosis as the mechanism of resistance to the pest. Cluster I genotypes and the Zapalote Chico genotype could be used for stacking genes for antibiosis and non-preference resistance. Key words: antibiosis, nutrition index, plant breeding, Spodoptera frugiperda. O objetivo do estudo foi avaliar genotipos de milho pipoca para resistencia a lagarta-do-cartucho, Spodoptera frugiperda. O experimento foi conduzido em delineamento inteiramente casualizado com 30 repeticoes. Foram avaliados os genotipos de milho pipoca Aelton, Arzm 05 083, Beija-Flor, Colombiana, Composto Chico, Composto Gaucha, Marcia, Mateus, Ufvm Barao Vicosa, Vanin, Viviane e Zapalote Chico. Larvas recem-eclodidas foram individualizadas para avaliacao do desenvolvimento biologico e consumo alimentar. Os dados foram submetidos a analise multivariada de variancia e a divergencia genetica entre genotipos foi avaliada atraves dos metodos de agrupamento de Tocher, com base na distancia generalizada de Mahalanobis e analise de variaveis canonicas. Sete genotipos, Aelton, Arzm 05 083, Composto Chico, CompostoGaucha, Marcia, Mateus e Viviane formaram um cluster (cluster I) que apresentaram antibiose com o mecanismo de resistencia a praga. Os genotipos do cluster I e Zapalote Chico podem ser usados para empilhar genes para resistencia por antibiose e nao-preferencia. Palavras-chave: antibiose, melhoramento de plantas, Spodoptera frugiperda.