Additive genes contribute to yield heterosis in rice

Abstract

The molecular mechanisms underlying heterosis remain unresolved, largely owing to the scarcity of accurately identified heterosis-associated genes. Here, we systematically investigate the inheritance patterns of three yield heterosis-related genes in rice, analyzing their effects in both homozygous and heterozygous genetic backgrounds. We find that heterozygosity at individual loci predominantly produces additive, rather than overdominant, effects. Nevertheless, heterozygous states of these genes generate yield heterosis in heterozygous genetic backgrounds, supporting the overdominance model. Our findings confirm that heterozygous additive genes are key contributors to yield heterosis in rice.

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BibTeX

@misc{dan2026additive,
  title = {{Additive genes contribute to yield heterosis in rice}},
  author = {Z. Dan and Y. Chen and T. Zhou and D. Yuan and W. Huang},
  howpublished = {bioRxiv},
  year = {2026},
  month = sep,
  doi = {10.64898/2026.09.14.750853},
  url = {https://www.biorxiv.org/content/10.64898/2026.09.14.750853v1},
  note = {CC BY-NC-ND},
}

RIS

TY  - UNPB
TI  - Additive genes contribute to yield heterosis in rice
AU  - Z. Dan
AU  - Y. Chen
AU  - T. Zhou
AU  - D. Yuan
AU  - W. Huang
PY  - 2026
DA  - 2026/09/14
PB  - bioRxiv
DO  - 10.64898/2026.09.14.750853
UR  - https://www.biorxiv.org/content/10.64898/2026.09.14.750853v1
AB  - The molecular mechanisms underlying heterosis remain unresolved, largely owing to the scarcity of accurately identified heterosis-associated genes. Here, we systematically investigate the inheritance patterns of three yield heterosis-related genes in rice, analyzing their effects in both homozygous and heterozygous genetic backgrounds. We find that heterozygosity at individual loci predominantly produces additive, rather than overdominant, effects. Nevertheless, heterozygous states of these genes generate yield heterosis in heterozygous genetic backgrounds, supporting the overdominance model. Our findings confirm that heterozygous additive genes are key contributors to yield heterosis in rice.
ER  -

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