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September 15, 2008GeneticsOpen Access

Dominance, Overdominance and Epistasis Condition the Heterosis in Two Heterotic Rice Hybrids

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Authors

LLLanzhi LiHunan Agricultural University LKLu Kaiyang ZCZhaoming ChenNanjing University of Chinese Medicine

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Implication

QTL mapping study uncovers the genetic basis of yield heterosis in hybrid rice, indicating an orchestrated effect of dominance, overdominance, and epistasis.

Key Points

Determine the genetic mechanisms conditioning heterosis for yield and yield-related traits in inter- and intrasubspecific hybrid rice.
Evaluated 9 yield-related traits across parents, F1, recombinant inbred lines (N=194 for an inter-subspecific hybrid; N=222 for an intrasubspecific hybrid), and their respective backcross populations.
Identified quantitative trait loci (QTL) and digenic interactions using midparent heterosis values, recombinant inbred line performance, and backcross population summation and subtraction data.
Detected 76 QTL in the inter-subspecific hybrid (42% additive, 32% dominant, 26% overdominant) and 41 QTL in the intrasubspecific hybrid (32% additive, 29% dominant, 39% overdominant), with individual QTL explaining 2.6% to 58.3% of phenotypic variance.
Identified 195 digenic interactions in the inter-subspecific hybrid and 328 in the intrasubspecific hybrid, which individually accounted for 2.0% to 14.9% of trait variance.

Cite This Study

Li et al. (2008) studied this question.

synapsesocial.com/papers/6a985b9a8d46cbe353245abe https://doi.org/10.1534/genetics.108.091942

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Also Consider

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