A Dynamic and Complex Network Regulates the Heterosis of Yield-Correlated Traits in Rapeseed (Brassica napus L.)
Open Access
- 1 July 2011
- journal article
- research article
- Published by Public Library of Science (PLoS) in PLOS ONE
- Vol. 6 (7), e21645
- https://doi.org/10.1371/journal.pone.0021645
Abstract
Although much research has been conducted, the genetic architecture of heterosis remains ambiguous. To unravel the genetic architecture of heterosis, a reconstructed F2 population was produced by random intercross among 202 lines of a double haploid population in rapeseed (Brassica napus L.). Both populations were planted in three environments and 15 yield-correlated traits were measured, and only seed yield and eight yield-correlated traits showed significant mid-parent heterosis, with the mean ranging from 8.7% (branch number) to 31.4% (seed yield). Hundreds of QTL and epistatic interactions were identified for the 15 yield-correlated traits, involving numerous variable loci with moderate effect, genome-wide distribution and obvious hotspots. All kinds of mode-of-inheritance of QTL (additive, A; partial-dominant, PD; full-dominant, D; over-dominant, OD) and epistatic interactions (additive × additive, AA; additive × dominant/dominant × additive, AD/DA; dominant × dominant, DD) were observed and epistasis, especially AA epistasis, seemed to be the major genetic basis of heterosis in rapeseed. Consistent with the low correlation between marker heterozygosity and mid-parent heterosis/hybrid performance, a considerable proportion of dominant and DD epistatic effects were negative, indicating heterozygosity was not always advantageous for heterosis/hybrid performance. The implications of our results on evolution and crop breeding are discussed.Keywords
This publication has 71 references indexed in Scilit:
- Cell Number Regulator1Affects Plant and Organ Size in Maize: Implications for Crop Yield Enhancement and HeterosisTHE PLANT CELL ONLINE, 2010
- A gene controlling the number of primary rachis branches also controls the vascular bundle formation and hence is responsible to increase the harvest index and grain yield in riceTheoretical and Applied Genetics, 2009
- Comparative mapping of quantitative trait loci involved in heterosis for seedling and yield traits in oilseed rape (Brassica napus L.)Theoretical and Applied Genetics, 2009
- QTL analysis of early stage heterosis for biomass in ArabidopsisTheoretical and Applied Genetics, 2009
- Altered circadian rhythms regulate growth vigour in hybrids and allopolyploidsNature, 2008
- Ancestral Chromosomal Blocks Are Triplicated in Brassiceae Species with Varying Chromosome Number and Genome SizePlant Physiology, 2007
- A comparative linkage map of oilseed rape and its use for QTL analysis of seed oil and erucic acid contentTheoretical and Applied Genetics, 2006
- Epistasis correlates to genomic complexityProceedings of the National Academy of Sciences of the United States of America, 2006
- Unraveling the genetic basis of hybrid vigorProceedings of the National Academy of Sciences of the United States of America, 2006
- Overdominant quantitative trait loci for yield and fitness in tomatoProceedings of the National Academy of Sciences of the United States of America, 2006