Quantitative Trait Locus Analysis of Stalk Strength in Four Maize Populations

Flint-García, Sherry; Jampatong, Chaba; Darrah, L. L.; McMullen, Michael D.

doi:10.2135/cropsci2003.0013

Cited by 154 publications

(156 citation statements)

References 15 publications

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“…Our results are also consistent with a recent resequencing study showing modest genome-wide effects of recent selection in a limited but geographically diverse sample of maize accessions (23). Nonetheless, a considerable number of candidate regions are identified across the genome, containing many genes affecting processes of agronomic relevance such as lignin synthesis (24) and response to auxin (25) and stress (1). It must also be noted that we have mapped selection associated with breeding progress per se, and that further analyses may detect selective changes specific to individual heterotic groups.…”

Section: Discussionsupporting

confidence: 91%

Historical genomics of North American maize

Heerwaarden¹,

Hufford²,

Ross‐Ibarra

2012

Proc. Natl. Acad. Sci. U.S.A.

149

133

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Since the advent of modern plant breeding in the 1930s, North American maize has undergone a dramatic adaptation to high-input agriculture. Despite the importance of genetic contributions to historical yield increases, little is known about the underlying genomic changes. Here we use high-density SNP genotyping to characterize a set of North American maize lines spanning the history of modern breeding. We provide a unique analysis of genomewide developments in genetic diversity, ancestry, and selection. The genomic history of maize is marked by a steady increase in genetic differentiation and linkage disequilibrium, whereas allele frequencies in the total population have remained relatively constant. These changes are associated with increasing genetic separation of breeding pools and decreased diversity in the ancestry of individual lines. We confirm that modern heterotic groups are the product of ongoing divergence from a relatively homogeneous landrace population, but show that differential landrace ancestry remains evident. Using a recent association approach, we characterize signals of directional selection throughout the genome, identifying a number of candidate genes of potential agronomic relevance. However, overall we find that selection has had limited impact on genome-wide patterns of diversity and ancestry, with little evidence for individual lines contributing disproportionately to the accumulation of favorable alleles in today's elite germplasm. Our data suggest breeding progress has mainly involved selection and recombination of relatively common alleles, contributed by a representative but limited set of ancestral lines.

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Section: Discussionsupporting

confidence: 91%

Historical genomics of North American maize

Heerwaarden¹,

Hufford²,

Ross‐Ibarra

2012

Proc. Natl. Acad. Sci. U.S.A.

149

133

View full text Add to dashboard Cite

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“…Marker-assisted selection has potential to improve the efficiency of selection for lodging resistance in breeding programs. Thus, QTL studies on the correlation between LD and other traits have been performed in several cereal crops, such as soybean, rice (Kashiwagi et al, 2008;Zhu et al, 2008), wheat Zuber et al, 1999;Börner et al, 2002;Kelbert et al, 2004;Verma et al, 2005), maize (Flint-Garcia et al, 2003), and field pea. However, little information related to barley LD has been reported to date (Sameri et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

Genetic relationship between lodging and lodging components in barley (Hordeum vulgare) based on unconditional and conditional quantitative trait locus analyses

Chen¹,

Liu²,

Deng³

et al. 2014

Genet. Mol. Res.

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ABSTRACT. Lodging (LD) is a major constraint limiting the yield and forage quality of barley. Detailed analyses of LD component (LDC) traits were conducted using 246 F 2 plants generated from a cross between cultivars ZQ320 and 1277. Genetic relationships between LD and LDC were evaluated by unconditional and conditional quantitative trait locus (QTL) mapping with 117 simple sequence repeat markers. Ultimately, 53 unconditional QTL related to LD were identified on seven barley chromosomes. Up to 15 QTL accounted for over 10% of the phenotypic variation, and up to 20 QTL for culm strength were detected. Six QTL with pleiotropic effects showing significant negative correlations with LD were found between markers Bmag353 and GBM1482 on chromosome 4H. These alleles and alleles of QTL for wall thickness, culm strength, plant height, and plant weight originated from ZQ320. Conditional mapping identified 96 additional QTL for LD. Conditional QTL analysis demonstrated that plant height, plant height center of gravity, and length of the sixth internode had the greatest contribution to LD, whereas culm strength and length of the fourth internode, and culm strength of the second internode were the key factors for LD-resistant. Therefore, lodging resistance in barley can be improved based on selection of alleles affecting culm strength, wall thickness, plant height, and plant weight. The conditional QTL mapping method can be used to evaluate possible genetic relationships between LD and LDC while efficiently and precisely determining counteracting QTL, which will help in understanding the genetic basis of LD in barley.

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“…In China, the planting areas of maize have exceeded that of rice, and maize has become the most widely planted crop (Tong 2010;Weng 2010). However, stalk lodging causes maize yield losses estimated in the range of 5-20% annually worldwide (Flint-Garcia et al 2003). In China, stalk lodging in maize has become the major factor restricting maize yield and planting density (Gou et al 2010).…”

Section: Introductionmentioning

confidence: 99%

“…Yao (2003) estimated that the general combining ability (GCA) and specific combining ability (SCA) could explain 48.7 and 51.3% of the genetic variance, respectively. Flint-Garcia et al (2003) detected eight, ten, eight and nine single-effect quantitative trait loci (QTLs) and four, two, zero, and five epistatic interactions for RPR in four maize populations.…”

Section: Introductionmentioning

confidence: 99%

Identifying quantitative trait loci and determining closely related stalk traits for rind penetrometer resistance in a high-oil maize population

Meng

Wang

et al. 2012

Theor Appl Genet

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Stalk lodging in maize causes annual yield losses between 5 and 20% worldwide. Many studies have indicated that maize stalk strength significantly negatively correlates with lodging observed in the field. Rind penetrometer resistance (RPR) measurements can be used to effectively evaluate maize stalk strength, but little is known about the genetic basis of this parameter. The objective of this study was to explore a genetic model and detect quantitative trait loci (QTL) of RPR and determine relationships between RPR and other stalk traits, especially cell wall chemical components. RPR is quantitative trait in nature, and both additive and non-additive effects may be important to consider for the improvement of RPR. Nine additive-effect QTLs covering nine chromosomes, except chromosome 5, and one pair of epistatic QTLs were detected for RPR. CeSA11 involved in cellulose synthesis and colorless2 involved in lignin synthesis were identified as possible candidate genes for RPR. Internode diameter (InD), fresh weight of internode (FreW), dry weight of internode (DryW), fresh weight and dry weight as well as cell wall components per unit volume significantly positively correlated with RPR. The internode water content (InW) significantly negatively correlated with RPR. Notably, these traits significantly correlated with RPR, and the QTLs of these traits co-localized with those of RPR. The corresponding results obtained from correlation analysis and QTL mapping suggested the presence of pleitropism or linkage between genes and indicated that these different approaches may be used for cross authentication of relationships between different traits.

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Quantitative Trait Locus Analysis of Stalk Strength in Four Maize Populations

Cited by 154 publications

References 15 publications

Historical genomics of North American maize

Historical genomics of North American maize

Genetic relationship between lodging and lodging components in barley (Hordeum vulgare) based on unconditional and conditional quantitative trait locus analyses

Identifying quantitative trait loci and determining closely related stalk traits for rind penetrometer resistance in a high-oil maize population

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