Dissection of the genetic basis of heterosis in an elite maize hybrid by QTL mapping in an immortalized F2 population

Tang, Jihua; Yan, Jianbing; Ma, Xiqing; Teng, Wen-Tao; Wu, Weiren; Dai, Jingrui; Dhillon, B. S.; Melchinger, Albrecht E.; Li, Jiansheng

doi:10.1007/s00122-009-1213-0

Cited by 118 publications

(140 citation statements)

References 27 publications

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“…However, the previous segregating populations were given for F 2:3 families (Ribaut et al, 1997;Agrama et al, 1999;Xiao et al, 2005); this kind of population is temporary and cannot be reused, because no continued plants are used for phenotypic and genetic analysis (Pilet et al, 2001). But the RIL population, as used in our study, is immortal and could be utilized in different regions and times, similar to previous reports (Tang et al, 2010;Trachsel et al, 2010). Moreover, previous ecological conditions designed for QTL mapping controlling KNE were mainly concentrated on water-content differences in soil (Ribaut et al, 1997;Frova et al, 1999;Xiao et al, 2005;Prasanna et al, 2009), whereas different N regimes were rarely used, although it is a very important one affecting KNE.…”

Section: Discussionsupporting

confidence: 76%

“…Alternatively, a recombinant inbred line (RIL) population is immortal and can be utilized repeatedly, owing to homogenous genotypes forming segregating populations (Pilet et al, 2001). However, RIL populations have been rarely used to map the QTLs for KNE, despite being frequently applied to other agronomic traits of maize (Tang et al, 2010;Trachsel et al, 2010). Therefore, it is useful to carry out the studies on QTL mapping for KNE using a RIL population in maize.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Genetic loci mapping associated with maize kernel number per ear based on a recombinant inbred line population grown under different nitrogen regimes

Liu

He²,

Zheng³

et al. 2011

Genet. Mol. Res.

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ABSTRACT. Kernel number per ear (KNE) is one of the most important yield-related agronomic traits in maize (Zea mays). To clarify its genetic basis, we made a quantitative trait locus (QTL) analysis of KNE in a recombinant inbred line population derived from lines Mo17 and Huangzao4, under two nitrogen (N) regimes. Seven QTLs, on chromosomes 4, 6 and 9, were mapped under the high N regime, which explained phenotypic variation ranging from 5.03 to 15.49%. Under the low N regime, three QTLs were located on chromosomes 6 and 9, which accounted for phenotypic variation ranging from 8.54 to 12.21%. These QTLs had different mapping intervals to their nearest markers, ranging from 0 to 16.5 cM. According to the chromosome positions and genetic effects of these QTLs, only seven QTLs for KNE were identified in our experiment, out of which three were found under both N regimes, on chromosomes 6 (one) and 9 (two); the other four were mapped only under the high N regime, on chromosomes 4 (three) and 6 (one). This information could be useful for developing marker-assisted selection in maize-breeding projects.

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Section: Discussionsupporting

confidence: 76%

Section: Introductionmentioning

confidence: 99%

Genetic loci mapping associated with maize kernel number per ear based on a recombinant inbred line population grown under different nitrogen regimes

Liu

He²,

Zheng³

et al. 2011

Genet. Mol. Res.

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“…Such studies are limited by the density and genomic coverage of genetic markers, so the most convincing genomic characterizations of heterosis come from genetic model systems including rice (Oryza sativa), maize, cotton (Gossypium hirsutum), and Arabidopsis (Arabidopsis thaliana). These genomic studies paint heterosis as the cumulative result of many loci that have a mixture of dominant, overdominant, and epistatic effects (Tang et al, 2010;Zhou et al, 2012;Shen et al, 2014;Shang et al, 2015). There is one notable exception to this pattern, a single locus controlling heterosis for yield in tomato (Solanum lycopersicum).…”

Section: Heterosismentioning

confidence: 99%

Hybridization in Plants: Old Ideas, New Techniques

2016

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Hybridization has played an important role in the evolution of many lineages. With the growing availability of genomic tools and advancements in genomic analyses, it is becoming increasingly clear that gene flow between divergent taxa can generate new phenotypic diversity, allow for adaptation to novel environments, and contribute to speciation. Hybridization can have immediate phenotypic consequences through the expression of hybrid vigor. On longer evolutionary time scales, hybridization can lead to local adaption through the introgression of novel alleles and transgressive segregation and, in some cases, result in the formation of new hybrid species. Studying both the abundance and the evolutionary consequences of hybridization has deep historical roots in plant biology. Many of the hypotheses concerning how and why hybridization contributes to biological diversity currently being investigated were first proposed tens and even hundreds of years ago. In this Update, we discuss how new advancements in genomic and genetic tools are revolutionizing our ability to document the occurrence of and investigate the outcomes of hybridization in plants.

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“…Although there have been a large number of genetic analyses in plants with results favoring one hypothesis or another (18)(19)(20)(21)(22)(23)(24)(25)(26)(27)(28)(29)(30)(31), genetic composition pertaining to heterotic performance of crop hybrids has not been fully characterized in an experimental population. There has been no assessment about the relative contributions of these genetic components to heterosis in a crop hybrid.…”

Section: Epistasis | Recombinant Inbred Intercrossmentioning

confidence: 99%

Genetic composition of yield heterosis in an elite rice hybrid

Zhou

Chen

Yao

et al. 2012

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

214

213

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Heterosis refers to the superior performance of hybrids relative to the parents. Utilization of heterosis has contributed tremendously to the increased productivity in many crops for decades. Although there have been a range of studies on various aspects of heterosis, the key to understanding the biological mechanisms of heterotic performance in crop hybrids is the genetic basis, much of which is still uncharacterized. In this study, we dissected the genetic composition of yield and yield component traits using data of replicated field trials of an "immortalized F 2 " population derived from an elite rice hybrid. On the basis of an ultrahigh-density SNP bin map constructed with population sequencing, we calculated single-locus and epistatic genetic effects in the whole genome and identified components pertaining to heterosis of the hybrid. The results showed that the relative contributions of the genetic components varied with traits. Overdominance/pseudo-overdominance is the most important contributor to heterosis of yield, number of grains per panicle, and grain weight. Dominance × dominance interaction is important for heterosis of tillers per plant and grain weight and has roles in yield and grain number. Single-locus dominance has relatively small contributions in all of the traits. The results suggest that cumulative effects of these components may adequately explain the genetic basis of heterosis in the hybrid. epistasis | recombinant inbred intercross H eterosis, or hybrid vigor, refers to the superior performance of the hybrids relative to the parents (1). Utilization of heterosis has tremendously increased productivity of many crops globally. However, the understanding of the underpinning biological mechanism is still fragmentary after a century of debate and quest. Although there have been a range of studies on various aspects of heterosis (2-5), the key to understanding the biological mechanisms of heterotic performance in crop hybrids is the genetic basis (6), much of which is still uncharacterized (7).Three classic genetic hypotheses-dominance (8-11), overdominance (12-15), and epistasis (16, 17)-were proposed as explanations for the genetic basis of heterosis. Although there have been a large number of genetic analyses in plants with results favoring one hypothesis or another (18-31), genetic composition pertaining to heterotic performance of crop hybrids has not been fully characterized in an experimental population. There has been no assessment about the relative contributions of these genetic components to heterosis in a crop hybrid.The following conditions should be met for complete genetic characterization of heterosis relevant to crop production: (i) the genetic materials are based on elite hybrids that have shown timehonored superiority in crop production; (ii) the targets are key traits of agronomic performance; (iii) the experimental population allows identification of all of the genetic components concerned, including dominance (d/a ≤1, where d is the dominant effect and a is the additiv...

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Dissection of the genetic basis of heterosis in an elite maize hybrid by QTL mapping in an immortalized F2 population

Cited by 118 publications

References 27 publications

Genetic loci mapping associated with maize kernel number per ear based on a recombinant inbred line population grown under different nitrogen regimes

Genetic loci mapping associated with maize kernel number per ear based on a recombinant inbred line population grown under different nitrogen regimes

Hybridization in Plants: Old Ideas, New Techniques

Genetic composition of yield heterosis in an elite rice hybrid

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