Evidence map›Paper›PMID 26362607›Full record

ArticleThe Plant cell2015

The Birth of a Black Rice Gene and Its Local Spread by Introgression.

Tetsuo Oikawa, Hiroaki Maeda, Taichi Oguchi, Takuya Yamaguchi, Noriko Tanabe, Kaworu Ebana, Masahiro Yano, Takeshi Ebitani, Takeshi Izawa

Open access · bronzeAbstract read
In one paragraph

Article in The Plant cell, 2015. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 80 papers.

0numbers the graph read from it
0cells of the map it votes in
80citing papers in PubMed
4.8field-weighted citation impact, top 4% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

80 citing papers in PubMed, 241 citations in OpenAlex.

  1. Review
  2. Review
  3. Review
  4. Article
  5. Article
  6. Two bHLH Transcription Factor GenesPlants (Basel, Switzerland) · 2026
    Article
  7. Review
  8. Article
  9. Article
  10. Article
  11. Review
  12. Harnessing neo-domestication of wild pigmented rice for enhanced nutrition and sustainable agriculture.TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik · 2025
    Review
  13. Review
  14. Review
  15. Article
  16. Article
  17. Review
  18. Review
  19. Article
  20. Article

20 more citing papers are in PubMed but not listed here.

4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

9 authors at 2 institutions in 1 country.

Tetsuo OikawaFunctional Plant Research Unit, National Institute of Agrobiological Sciences, Tsukuba, Ibaraki 305-8602, Japan.
Hiroaki MaedaToyama Prefectural Agricultural, Forestry and Fisheries Research Center, Toyama, Toyama 939-8153, Japan.
Taichi OguchiFunctional Plant Research Unit, National Institute of Agrobiological Sciences, Tsukuba, Ibaraki 305-8602, Japan.
Takuya YamaguchiToyama Prefectural Agricultural, Forestry and Fisheries Research Center, Toyama, Toyama 939-8153, Japan.
Noriko TanabeFunctional Plant Research Unit, National Institute of Agrobiological Sciences, Tsukuba, Ibaraki 305-8602, Japan.
Kaworu EbanaRice Applied Genomics Research Unit, National Institute of Agrobiological Sciences, Tsukuba, Ibaraki 305-8602, Japan.
Masahiro YanoRice Applied Genomics Research Unit, National Institute of Agrobiological Sciences, Tsukuba, Ibaraki 305-8602, Japan.
Takeshi EbitaniToyama Prefectural Agricultural, Forestry and Fisheries Research Center, Toyama, Toyama 939-8153, Japan.ORCID http://orcid.org/0000-0002-5726-1610
Takeshi IzawaFunctional Plant Research Unit, National Institute of Agrobiological Sciences, Tsukuba, Ibaraki 305-8602, Japan tizawa@affrc.go.jp.
Institute of Agrobiological Sciences · JPToyama Prefectural Agricultural, Forestry & Fisheries Research Center · JP

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

The origin and spread of novel agronomic traits during crop domestication are complex events in plant evolution. Wild rice (Oryza rufipogon) has red grains due to the accumulation of proanthocyanidins, whereas most cultivated rice (Oryza sativa) varieties have white grains induced by a defective allele in the Rc basic helix-loop-helix (bHLH) gene. Although the events surrounding the origin and spread of black rice traits remain unknown, varieties with black grains due to anthocyanin accumulation are distributed in various locations throughout Asia. Here, we show that the black grain trait originated from ectopic expression of the Kala4 bHLH gene due to rearrangement in the promoter region. Both the Rc and Kala4 genes activate upstream flavonol biosynthesis genes, such as chalcone synthase and dihydroflavonol-4-reductase, and downstream genes, such as leucoanthocyanidin reductase and leucoanthocyanidin dioxygenase, to produce the respective specific pigments. Genome analysis of 21 black rice varieties as well as red- and white-grained landraces demonstrated that black rice arose in tropical japonica and its subsequent spread to the indica subspecies can be attributed to the causal alleles of Kala4. The relatively small size of genomic fragments of tropical japonica origin in some indica varieties indicates that refined introgression must have occurred by natural crossbreeding in the course of evolution of the black trait in rice.

Indexed as

AcyltransferasesAlcohol OxidoreductasesAllelesBasic Helix-Loop-Helix ProteinsBiological EvolutionCrops, AgriculturalDNA MethylationGene Expression Regulation, PlantOryzaOxygenasesPigmentationPlant ProteinsPlants, Genetically ModifiedPromoter Regions, GeneticAcyltransferasesAlcohol OxidoreductasesBasic Helix-Loop-Helix Proteinsdihydroflavanol 4-reductaseflavanone synthetaseleucoanthocyanidin dioxygenaseOxygenasesPlant Proteins

Identifiers

PMID26362607
PMCPMC4815089
OpenAlexW2196863019

What OpenQuestion holds

Textmetadata
Read underepoch 390

Registered trials

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.