Abstract
Abstract A T1 (sugarcane population originating from true seeds) and T2 (first sugarcane clonal stage) population were used to estimate genetic parameters and compare selection strategies for Diatraea saccharalis (Lepidoptera: Crambidae) resistance in sugarcane. In the T1 stage, heritability at the family mean level (h²=0.77) was higher than individual genotype heritability (h²=0.16), and the additive genetic effect was more important for sugarcane borer resistance than non-additive effects. In addition, there was high genotypic variance among and within full-sib families. In the T2 population, genotypic variance was high, and heritability at the clone mean level was moderate (h²=0.61). We can conclude that family experiments enable selection of more promising families and parents for borer resistance. However, due to high genotypic variance within families, family selection at the T1 stage must be followed by clone selection at the T2 stage.
Highlights
The sugarcane stalk borer Diatraea saccharalis Fab. (Lepidoptera: Crambidae) is one of the main sugarcane pests in Brazil (Dinardo-Miranda et al 2012)
The use of sugarcane varieties resistant to the borer could be an important tool for Integrated Management, reducing the costs associated with Cotesia releases and insecticide spraying
Previous studies have demonstrated that some sugarcane genotypes in Brazil have genes that confer some degree of resistance to D. saccharalis
Summary
The sugarcane stalk borer Diatraea saccharalis Fab. (Lepidoptera: Crambidae) is one of the main sugarcane pests in Brazil (Dinardo-Miranda et al 2012). Previous studies have demonstrated that some sugarcane genotypes in Brazil have genes that confer some degree of resistance to D. saccharalis This resistance is due to the presence of some leaf component that causes higher mortality of early-stage larvae, some barrier on the stalk surface that hinders or delays larvae penetration within the stalks, or some trait within the stalks that reduces larval feeding and/or affects larval performance (Dinardo-Miranda et al 2012, Tomaz et al 2017, Pimentel et al 2017). A T1 (seedlings originating from true seed) and a T2 (first clonal selection stage) population were used to estimate genetic parameters, to compare selection strategies, and to identify superior parents, families, and clones for borer resistance. The purpose of using the T1 stage was to estimate heritability on a family mean basis and individually, genotypic variance among families, and additive and dominance genetic effects; to compare individual, family, or parent selection; and to identify promising parents and families for resistance to borer. The T2 stage aimed to estimate heritability for clone means and genotypic variance among clones, to assess the efficiency of family selection at the T1 stage, and to identify clones with superior borer resistance
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