2009
DOI: 10.1007/s00122-009-1213-0
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Dissection of the genetic basis of heterosis in an elite maize hybrid by QTL mapping in an immortalized F2 population

Abstract: The genetic basis of heterosis for grain yield and its components was investigated at the single- and two-locus levels using molecular markers with an immortalized F(2) (IF(2)) population, which was developed by pair crosses among recombinant inbred lines (RILs) derived from the elite maize hybrid Yuyu22. Mid-parent heterosis of each cross in the IF(2) population was used to map heterotic quantitative trait loci. A total of 13 heterotic loci (HL) were detected. These included three HL for grain yield, seven fo… Show more

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Cited by 119 publications
(140 citation statements)
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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%
See 1 more Smart Citation
“…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%
“…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%
“…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%