Popcorn genotypes resistance to fall armyworm

ABSTRACT: 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 Gaúcha, Márcia, Mateus, Ufvm Barão Viçosa, 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 Gaúcha, Márcia, 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.

摘要：本研究旨在评估爆米花基因型对草地贪夜蛾（Spodoptera frugiperda）的抗性。实验采用完全随机设计（completely randomized design），设置30次重复。供试材料包括爆米花基因型Aelton、Arzm 05 083、Beija-Flor、Colombiana、Composto Chico、Composto Gaúcha、Márcia、Mateus、Ufvm Barão Viçosa、Vanin、Viviane，以及普通玉米品种Zapalote Chico。将初孵草地贪夜蛾幼虫单独饲养，分别评估其生物学发育进程与食物消耗量。对所得数据进行多变量方差分析（multivariate analyses of variance），并基于广义马氏距离（generalized Mahalanobis distances）与典范变量分析（canonical variable analyses），通过Tocher聚类法（clustering methods of Tocher）评估各基因型间的遗传分化。结果表明，Aelton、Arzm 05 083、Composto Chico、Composto Gaúcha、Márcia、Mateus、Viviane共7个爆米花基因型聚为一类（聚类I），该类群对该害虫的抗性机制为抗生性（antibiosis）。聚类I的基因型与Zapalote Chico品种可用于堆叠抗生性与非选择性抗性（non-preference resistance）基因。