Association mapping for traits related to nitrogen use efficiency in tropical maize lines under field conditions

Morosini, Júlia Silva; Mendonça, Leandro de Freitas; Lyra, Danilo Hottis; Galli, Giovanni; Vidotti, Miriam Suzane; Fritsche‐Neto, Roberto

doi:10.1007/s11104-017-3479-3

Cited by 35 publications

(34 citation statements)

References 65 publications

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“…Ever since, reports have validated the methodology [9][10][11]. Our results showed no advantage in combining MAS and GP for predicting LNTI, a low-heritability highly polygenic trait [18], of tropical maize hybrids. That corroborates the findings of Bernardo [3], Li et al [34], and Spindel et al [10], which On the usefulness of parental lines GWAS for predicting hybrids in tropical maize suggest that differentially modeling significant markers improve prediction performance only when the trait is highly heritable and the markers explain a fair proportion of the genetic variance.…”

Section: Genome-wide Association Analysis Based On Hybrids Performancementioning

confidence: 63%

“…Principal Component Analysis (PCA) and Admixture Clustering revealed the existence of two subpopulations in the inbred lines germplasm [18,31]. Additionally, according to Morosini et al [18], the panel presents a mean length of LD decay of 80-100 kb (r 2 = 0.13). Since no Mendelian sampling occurred from parental lines to single-crosses for the markers considered (homozygous only), the LD decay should remain similar on the offspring.…”

Section: Genomic Datamentioning

confidence: 96%

“…To verify the usefulness of inbred line GWAS in hybrid maize breeding, we selected the case study of Low Nitrogen Tolerance Index (LNTI), a critical, lowly heritable trait. Inbred line GWAS on this trait has been reported by Morosini et al [18]. The genetic material was composed of 906 maize single-crosses [22] obtained in a partial diallel using 49 of the 64 inbred lines studied in Morosini et al [18] (S1 Table).…”

Section: Phenotype Assessment and Analysismentioning

confidence: 99%

“…Inbred line GWAS on this trait has been reported by Morosini et al [18]. The genetic material was composed of 906 maize single-crosses [22] obtained in a partial diallel using 49 of the 64 inbred lines studied in Morosini et al [18] (S1 Table). The 49 inbred lines were selected based on their nitrogen use efficiency [23] and identified as belonging from two heterotic groups, 35 flint and 15 dent [24].…”

Section: Phenotype Assessment and Analysismentioning

confidence: 99%

“…One of the most popular methods of studying the genetic control is by genome-wide association studies (GWAS). GWAS has been extensively applied to maize populations for important agronomical traits such as foliar architecture [13], seed oil concentration and composition [14], resistance to diseases [15,16], root development [17], nitrogen use related traits [18], and plant height [19]. These studies showed that the methodology is efficient at finding candidate genes from which desirable allelic variants can be selected by breeders [20].…”

Section: Introductionmentioning

confidence: 99%

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On the usefulness of parental lines GWAS for predicting low heritability traits in tropical maize hybrids

et al. 2020

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Genome-wide association studies (GWAS) is one of the most popular methods of studying the genetic control of traits. This methodology has been intensely performed on inbred genotypes to identify causal variants. Nonetheless, the lack of covariance between the phenotype of inbred lines and their offspring in cross-pollinated species (such as maize) raises questions on the applicability of these findings in a hybrid breeding context. To address this topic, we incorporated previously reported parental lines GWAS information into the prediction of a low heritability trait in hybrids. This was done by marker-assisted selection based on significant markers identified in the lines and by genomic prediction having these markers as fixed effects. Additive-dominance GWAS of hybrids, a non-conventional procedure, was also performed for comparison purposes. Our results suggest that incorporating information from parental inbred lines GWAS led to decreases in the predictive ability of hybrids. Correspondingly, inbred lines and hybrids-based GWAS yielded different results. These findings do not invalidate GWAS on inbred lines for selection purposes, but mean that it may not be directly useful for hybrid breeding. OPEN ACCESSCitation: Galli G, Alves FC, Morosini JS, Fritsche-Neto R (2020) On the usefulness of parental lines GWAS for predicting low heritability traits in tropical maize hybrids. PLoS ONE 15(2): e0228724. https://doi.org/10.1371/journal.

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Section: Genome-wide Association Analysis Based On Hybrids Performancementioning

confidence: 63%

Section: Genomic Datamentioning

confidence: 96%

Section: Phenotype Assessment and Analysismentioning

confidence: 99%

Section: Phenotype Assessment and Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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On the usefulness of parental lines GWAS for predicting low heritability traits in tropical maize hybrids

et al. 2020

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Genetics of extra‐early‐maturing yellow and orange quality protein maize inbreds and derived hybrids under low soil nitrogen and Striga infestation

et al. 2020

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Ideas 1. General combining ability (GCA) effects were superior over specific combining ability (SCA) effects indicating that additive genes largely controlled grain yield and other traits among the newly developed extra-early quality protein maize inbred lines under low nitrogen, Striga-infested and high nitrogen conditions. 2. Maternal genetic effects influenced plant height under Striga-infested condition which suggested that inbred lines that exhibited significant and positive GCA-female effects for plant height should not be used as female parents to avoid production of tall hybrids that are liable to lodging. 3. Genetic distances were significantly associated with grain yield under low nitrogen, Strigainfested and high nitrogen conditions which implied that inbred lines that had high pairwise genetic distances should be considered for hybrid production to maximize heterosis. This article is protected by copyright. All rights reserved. 2 4. TZEEQI 358 displayed significant and desirable GCA effects for grain yield and other important traits across low nitrogen, Striga-infested and high nitrogen conditions and could be a useful source of valuable alleles for population improvements. 5. TZEEIORQ 58 x TZEEQI 397 exhibited high grain yield and stability across the low nitrogen, Striga-infested and high nitrogen environments and could potentially address the food and nutritional insecurities prevailing in sub-Saharan Africa.

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Resistance to Abiotic Stress: Theory and Applications in Maize Breeding

Gadag

Bhat

Mukri

et al. 2021

Genomic Designing for Abiotic Stress Resistant Cereal Crops

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Association mapping for traits related to nitrogen use efficiency in tropical maize lines under field conditions

Cited by 35 publications

References 65 publications

On the usefulness of parental lines GWAS for predicting low heritability traits in tropical maize hybrids

On the usefulness of parental lines GWAS for predicting low heritability traits in tropical maize hybrids

Genetics of extra‐early‐maturing yellow and orange quality protein maize inbreds and derived hybrids under low soil nitrogen and Striga infestation

Resistance to Abiotic Stress: Theory and Applications in Maize Breeding

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