Inbreeding depression and average genetic components in green corn genotypes

Kuki, Maurício Carlos; Scapim, Carlos Alberto; Pinto, Ronald José Barth; Figueiredo, Alex Sandro Torre; Contreras‐Soto, Rodrigo Iván; Bertagna, Filipe Augusto Bengosi

doi:10.1590/0103-8478cr20160024

Cited by 6 publications

(11 citation statements)

References 10 publications

(17 reference statements)

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“…According to quadratic component magnitudes, the contribution of the GCA effect was higher for AN, SI, PH, EH, and GLS severity, which was an indication of additive effects that controlled these traits (Table 3). Similar results were also observed by Freitas Jr., Amaral Jr., Pereira, Cruz, and Scapim (2006) and Kuki et al (2017), who also observed higher importance for the additive effects for PH and EH, as well as flowering period. The contribution of the non-additive effects was higher only for WS severity and GY.…”

Section: Resultssupporting

confidence: 88%

Combining ability and genetic divergence among tropical maize inbred lines using SSR markers

et al. 2021

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Our objectives were to evaluate general and specific combining ability (SCA) and genetic divergence among tropical maize inbred lines using single sequence repeat (SSR) markers. Thirteen inbred lines were crossed based on a complete diallel scheme. Hybrids and three checks were evaluated in a lattice experimental design. Silk and anthesis flowering, average plant height, average ear height, white spot (Pantoea ananatis) and gray leaf spot (Cercospora zeae-maydis) severity, and grain yield were evaluated. Significant differences (p < 0.05) for general and specific combining abilities were observed for all traits. Based on additive effects, inbred lines 1 (Flash) and 12 (SG 6015) were selected to reduce the flowering period and plant and ear height. Inbred lines 2 (CD 303) and 3 (AG 8080) were selected to reduce disease severity. For the simultaneous increase in grain yield and reduced severity of diseases, line 11 (AG 9090) as a parent or tester in topcross schemes is recommended. According to non-additive effects, crosses 2 (CD 303) × 13 (DKB 747) and 11 (AG 9090) × 12 (SG 6015) were selected for grain yield and future breeding programs. Six groups were identified using SSR markers; a major group contained six inbred lines. Because of the minor relationship between genetic divergence and SCA effects on grain yield limits, the use of the groups for future divergent crosses is recommended.

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Section: Resultssupporting

confidence: 88%

Combining ability and genetic divergence among tropical maize inbred lines using SSR markers

et al. 2021

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“…Table 1 indicates that, among the traits evaluated, those related to production (EW and GW) had the highest inbreeding depression (ID), with means reaching 50.43% (EW) and 50.32% (GW). Several studies reported ID higher for the production variable than PH and EH (Scapim et al, 2006;Garbuglio et al, 2009;Bernini et al, 2013;Kuki et al, 2017). Good and Hallauer (1977) observed that production is the most affected variable by inbreeding in any degree of homozygosity.…”

Section: Resultsmentioning

confidence: 99%

“…Good and Hallauer (1977) observed that production is the most affected variable by inbreeding in any degree of homozygosity. According to Kuki et al (2017) and Bernini et al (2013), inbreeding depression for PH and EH is lower than for EW and GW, because the dominance effects are less important in these traits.…”

Section: Resultsmentioning

confidence: 99%

Inbreeding depression and performance of partially self-fertilized maize progenies in a top cross

Somera

Ragagnin

Costa

et al. 2018

Chil. j. agric. res.

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Information on the effect of endogamy and combining ability of inbred families is essential in hybrid maize (Zea mays L.) breeding programs. The objective of this study was to evaluate the effect of inbreeding in a maize population and the performance of top-cross hybrids from this population, with a broad genetic base tester. First, 110 S1 families were generated and established in the field along with families from the original population. The experiment was arranged in a randomized block design with three replicates, in 3.0 m plots with 15 plants. Traits of agronomic importance, inbreeding depression, and the general effect of dominance deviations were estimated the first stage. In the second stage, 69 inbred families (S2) with low inbreeding depression were evaluated by top-cross tests using the F2 generation of the commercial hybrid AG 6040 as tester. The same traits from the first stage were evaluated. Inbreeding depression in the first stage was higher for traits related to production, which indicates that the heterozygous loci contribute more to these traits, with the additive effects being less important. In the second stage, the best estimates of the general combining ability (GCA) for grain weight were found in progenies 51, 33, 17, 9, 3, and 67, showing good performance and good potential for use in breeding programs.

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“…This methodology has been widely adopted by several authors earlier, aiming to obtain the best populations for line extraction, and consequently reducing self-fertilization and evaluation costs of lines (Kuki et al, 2017). However, due to the dynamic of hybrid releases in the market, many maize hybrids do not have information about either their inbreeding depression or m+a and d, even in the case when this information is very valuable to initiate new breeding populations and continue the breeding cycles.…”

Section: Introductionmentioning

confidence: 99%

Mean components for choosing maize populations to extract inbred lines

et al. 2020

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The choice of germplasm is one of the most important phases of a genetic improvement program to the fact that it is the initial development stage of superior hybrids. Hence, the objectives of this study were to obtain the estimates of m+a and d, and inbreeding depression for grain yield and plant height traits, for cultivars lacking this information, and thus to predict the potential of maize hybrids for the extraction of lines. The F1 and F2 generations of 12 maize hybrids were tested at two sites, during the crop years of 2017-18 and 2018-19, accounting for four environments. Both the generations were evaluated in contiguous experiments in randomized blocks design with three and two repetitions during the years 2017-18 and 2018-19, respectively. The data on plant height and grain yield were collected, per plot, from both the generations, utilizing which, the m+a and d mean components were estimated. The effects of dominance had greater importance for the character grain yield. The most promising hybrids for extraction of lines were AG1051, AG8025, BG7046, DKB455, and OMEGA due to their greater estimates of m+a. The hybrids AG8025 and BG7046 were associated with high values of m+a and grain yield. For the plant height trait, there was a greater contribution of additive effects. Therefore, greater inbreeding depression was observed for the grain yield trait when compared to the height of the plant.

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Inbreeding depression and average genetic components in green corn genotypes

Cited by 6 publications

References 10 publications

Combining ability and genetic divergence among tropical maize inbred lines using SSR markers

Combining ability and genetic divergence among tropical maize inbred lines using SSR markers

Inbreeding depression and performance of partially self-fertilized maize progenies in a top cross

Mean components for choosing maize populations to extract inbred lines

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