Molecular Characterization of a Diverse Maize Inbred Line Collection and its Potential Utilization for Stress Tolerance Improvement

Wen, Weiwei; Araus, José Luís; Shah, Trushar; Cairns, Jill E.; Mahuku, George; Bänziger, Marianne; Torres, José L.; Sánchez, C.; Yan, Jianbing

doi:10.2135/cropsci2010.08.0465

Cited by 54 publications

(53 citation statements)

References 61 publications

(72 reference statements)

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“…Pedigree analysis placed 119 inbred maize lines into eight and SSR markers resulted in clustering the inbred lines into 10 groups (Reid et al, 2011). Similar results were reported by Wen et al (2011) where nine main subsets were clustered using pedigree information.…”

Section: Genetic Distancesupporting

confidence: 73%

Diversity and path coefficient analysis of Southern African maize hybrids

Mhoswa

Derera

Qwabe

et al. 2016

Chilean J. Agric. Res.

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Detailed knowledge on genetic diversity among germplasm is important for hybrid maize (Zea mays L.) breeding. The objective of the study was to determine genetic diversity in widely grown hybrids in Southern Africa, and compare effectiveness of phenotypic analysis models for determining genetic distances between hybrids. Fifty hybrids were evaluated at one site with two replicates. The experiment was a randomized complete block design. Phenotypic and genotypic data were analyzed using SAS and Power Marker respectively. There was significant (p < 0.01) variation and diversity among hybrid brands but small within brand clusters. Polymorphic Information Content (PIC) ranged from 0.07 to 0.38 with an average of 0.34 and genetic distance ranged from 0.08 to 0.50 with an average of 0.43. SAH23 and SAH21 (0.48) and SAH33 and SAH3 (0.47) were the most distantly related hybrids. Both single nucleotide polymorphism (SNP) markers and phenotypic data models were effective for discriminating genotypes according to genetic distance. SNP markers revealed nine clusters of hybrids. The 12-trait phenotypic analysis model, revealed eight clusters at 85%, while the five-trait model revealed six clusters. Path analysis revealed significant direct and indirect effects of secondary traits on yield. Plant height and ear height were negatively correlated with grain yield meaning shorter hybrids gave high yield. Ear weight, days to anthesis, and number of ears had highest positive direct effects on yield. These traits can provide good selection index for high yielding maize hybrids. Results confirmed that diversity of hybrids is small within brands and also confirm that phenotypic trait models are effective for discriminating hybrids.

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Section: Genetic Distancesupporting

confidence: 73%

Diversity and path coefficient analysis of Southern African maize hybrids

Mhoswa

Derera

Qwabe

et al. 2016

Chilean J. Agric. Res.

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“…Best eleven hybrids selected simultaneously based on grain yield (GY, Mg ha grain yield over maximizing heterosis and yield potential in final (commercial) three-way hybrids; therefore, use of lines from three different heterotic groups should be advantageous for meeting both objectives. On the other hand, in a study using a diverse panel of tropical and subtropical lines from CIMMYT and IITA stress tolerance breeding programs, Wen et al (2011) found considerable genetic variation within the existing CIMMYT heterotic groups A and B. Therefore, reclassification of working germplasm in CIMMYT breeding programs using methods such as molecular-marker-determined GDs and SCA analysis followed by the discriminant analysis of principal components (Jombart et al, 2010), as described herein, can be practical and effective in developing heterotic groups for further development and use in breeding programs.…”

Section: Discussionmentioning

confidence: 99%

Formation of Heterotic Groups and Understanding Genetic Effects in a Provitamin A Biofortified Maize Breeding Program

et al. 2014

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Developing biofortified maize (Zea mays L.) cultivars is a viable approach to combating the widespread problem of vitamin A deficiency among people for whom maize is a staple food. To enhance CIMMYT's provitamin A maize breeding efforts, this study: (i) evaluated whether separation of experimental maize lines into groups based on maximizing their molecular‐marker‐based genetic distances (GD) resulted in heterosis for among‐group crosses, (ii) assessed genetic effects (general and specific combining ability, GCA and SCA) for grain yield and provitamin A concentrations in hybrids among 21 inbred lines representing the three proposed groups, and (iii) assessed the association between grain yield and provitamin A concentrations. The lines were crossed following a partial diallel design resulting in 156 hybrids that were evaluated at four environments with two replications of one‐row plots. The first plant in each plot was self‐pollinated to produce grain for provitamin A analysis. Significant but small yield advantage of among‐ versus within‐group crosses (0.47 Mg ha−1, P < 0.05) suggested that the groups identified by maximizing GD could be a practical starting point for further breeding work to develop useful heterotic groups. Furthermore, the GD‐proposed heterotic groups were improved by later revising some line assignments to groups using estimates of SCA effects. General combining ability effects were significant (P < 0.01) for all traits, whereas SCA effects were weak (P < 0.05) or not significant for provitamin A carotenoid concentrations, indicating that these were controlled primarily by additive gene action. Grain yield was not significantly correlated with provitamin A concentration, indicating that both traits could be improved simultaneously.

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“…Maize plants were grown as part of the CIMMYT field trials, in which a collection of 300 hybrid lines representing the genetic diversity within the CIMMYT and International Institute of Tropical Agriculture tropical and subtropical maize improvement programs (Wen et al, 2011) were tested for tolerance to DS, HS, and DS+HS . Ten maize experimental hybrids (Table I) were chosen to cover a wide range of drought and heat tolerance on grain yield observed in previous field trials .…”

Section: Grain Yield Was Affected By Stress Treatmentsmentioning

confidence: 99%

“…While direct selection for grain yield under DS has resulted in admirable gains in grain yield under stress (Bänziger et al, 2006;Cairns et al, 2013), further improvement requires the incorporation of additional selection traits (Cairns et al, 2012a(Cairns et al, , 2012b. In recent years, genetic and phenotypic markers have been searched extensively for drought tolerance of maize by high-throughput genomic and phenotyping approaches, respectively (Tuberosa and Salvi, 2006;Wen et al, 2011;Araus et al, 2012;Cairns et al, 2013;Prasanna et al, 2013;Araus and Cairns, 2014;Tsonev et al, 2014). Moreover, metabolic markers started to draw attention due to their close relationship with yield phenotypes (Fernie and Schauer, 2009;Redestig et al, 2011;Riedelsheimer et al, 2012aRiedelsheimer et al, , 2012bWitt et al, 2012;Degenkolbe et al, 2013).…”

mentioning

confidence: 99%

Metabolite profiles of maize leaves in drought, heat and combined stress field trials reveal the relationship between metabolism and grain yield

et al. 2015

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The development of abiotic stress-resistant cultivars is of premium importance for the agriculture of developing countries. Further progress in maize (Zea mays) performance under stresses is expected by combining marker-assisted breeding with metabolite markers. In order to dissect metabolic responses and to identify promising metabolite marker candidates, metabolite profiles of maize leaves were analyzed and compared with grain yield in field trials. Plants were grown under well-watered conditions (control) or exposed to drought, heat, and both stresses simultaneously. Trials were conducted in 2010 and 2011 using 10 tropical hybrids selected to exhibit diverse abiotic stress tolerance. Drought stress evoked the accumulation of many amino acids, including isoleucine, valine, threonine, and 4-aminobutanoate, which has been commonly reported in both field and greenhouse experiments in many plant species. Two photorespiratory amino acids, glycine and serine, and myoinositol also accumulated under drought. The combination of drought and heat evoked relatively few specific responses, and most of the metabolic changes were predictable from the sum of the responses to individual stresses. Statistical analysis revealed significant correlation between levels of glycine and myoinositol and grain yield under drought. Levels of myoinositol in control conditions were also related to grain yield under drought. Furthermore, multiple linear regression models very well explained the variation of grain yield via the combination of several metabolites. These results indicate the importance of photorespiration and raffinose family oligosaccharide metabolism in grain yield under drought and suggest single or multiple metabolites as potential metabolic markers for the breeding of abiotic stress-tolerant maize.

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Molecular Characterization of a Diverse Maize Inbred Line Collection and its Potential Utilization for Stress Tolerance Improvement

Cited by 54 publications

References 61 publications

Diversity and path coefficient analysis of Southern African maize hybrids

Diversity and path coefficient analysis of Southern African maize hybrids

Formation of Heterotic Groups and Understanding Genetic Effects in a Provitamin A Biofortified Maize Breeding Program

Metabolite profiles of maize leaves in drought, heat and combined stress field trials reveal the relationship between metabolism and grain yield

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