Inheritance of resistance to Fusarium ear rot in popcorn

Abstract

To date, no studies on the inheritance of Fusarium spp. ear rot resistance in popcorn are available. The purpose of this paper was to investigate the additive-dominance model to estimate the genetic components of variance, heritability and the inheritance pattern in a diallel for popcorn, by Hayman's approach. The experiment was carried out in two environments, using eight parent lines. The following traits were measured: grain yield (GY), popping expansion (PE), incidence of ears infected by Fusarium (FusIE), total number of kernels infected by fungi (FunIK) and total number of kernels infected by Fusarium spp. (FusIK). The results indicated that the incidence of FusIK (Fusarium-infected kernels), FunIK (fungus-infected kernels), and FusIE (Fusarium-infected ears) is controlled by dominant genes. Parent L77 had a high number of favorable alleles for all resistance-related traits, as well as for PE. The strategy recommended for reduction of FunIK, FusIK, and FusIE consists of exploiting hetorosis using inbred lines with favorable alleles.

Analysis of Fusarium ear rot and fumonisin contamination in testcrosses of a maize biparental population

“…As agronomic control methods of fumonisin contamination often fail, and there is a considerable genetic variability for FER resistance in maize germplasm (Santiago et al 2013, Schwantes et al 2018, genetic improvement might be the optimal strategy in future maize breeding for tolerable fumonisin contamination in food and feed (Maschietto et al 2017). To date, many QTL studies were conducted in populations with low-density genetic maps, and QTL studies in densely mapped populations are rare (Lanubile et al 2017).…”

Combined Dominance and Additive Gene Effects in Trait Inheritance of Drought-Stressed and Full Irrigated Popcorn

“…This indicates that the hybrid mean is close to the mean of the best parent of a cross. On the other hand, Silva et al [15] and Schwantes et al [20], studying the inheritance of this trait under well-watered conditions, diagnosed partial dominance effects. These partial dominance values are in better agreement with most diallel studies with popcorn, almost all of which reported an additive action for PE [13,16,17,19,20].…”

“…On the other hand, Silva et al [15] and Schwantes et al [20], studying the inheritance of this trait under well-watered conditions, diagnosed partial dominance effects. These partial dominance values are in better agreement with most diallel studies with popcorn, almost all of which reported an additive action for PE [13,16,17,19,20]. However, in an evaluation of the same trait by SSR mapping, Babu et al [34] found QTLs with both dominant and partially dominant gene action.…”

“…Studies on the genetic effects on trait inheritance of popcorn under full irrigation [13][14][15][16][17] and under biotic stress [18,19], and among these, those using Hayman's diallel analysis [15,20], showed that the gene action of popping expansion is additive while that of grain yield and related components is mostly non-additive. For popcorn in water-stressed environments, this information is not available.…”

Research Article Water stress adaptation of popcorn roots and association with agronomic traits

“…For popcorn breeding, with a particular focus on water stress tolerance, two main traits are useful for the market; these being grain yield (GY) and popping expansion (PE). However, genetic correlation between these two traits is negative (de Lima et al, 2016;do Amaral Júnior et al, 2016;Schwantes et al, 2018), hampering indirect selection and simultaneous gains. To overcome this difficulty, some researchers have been using the trait expanded popcorn volume per hectare -PV (product of the mean grain yield per plot by the mean expansion capacity (de Lima et al, 2016;do Amaral Júnior et al, 2016).…”