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Basic Information
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CGSNL Gene Symbol
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B2
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Gene Symbol Synonym
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OsbHLH016, Kala4, OsKala4, OSB2, OsB2, OsTT8, TT8
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CGSNL Gene Name
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_
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Gene Name Synonym
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basic helix-loop-helix protein 016, Key gene for
black coloration by anthocyanin accumulation on chromosome 4, Transparent Testa 8
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Protein Name
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Allele
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Chromosome No.
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4
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Explanation
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AB021080. Both Pb (PURPLE PERICARP B) and Kala4 map to a region between RM1354 and RM7210 on chromosome 4 and it is suggest that Pb is an allele of Kala4 (Maeda et al. 2014). an R/B-type regulatory gene. OSB1 (Os04g0557800) and OSB2 (Os04g0557500) are the major components of the Plw allele (Sakamoto et al. 2001). TO:0001109: grain color trait.
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Trait Class
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Coloration - Anthocyanin
Seed
Seed - Morphological traits
Tolerance and resistance - Stress tolerance
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Expression
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Sequence/Locus
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cDNA Accession No.
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AB021080
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MSU ID
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LOC_Os04g47059.1
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RAP ID
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Os04g0557500
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Links
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Oryzabase Chromosome View
(
IRGSP 1.0
/
Build5
)
RAP-DB
(
IRGSP 1.0
/
Build5
)
Related IDs List (
IRGSP 1.0
/
Build5
)
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INSD Accession List
(Test version)
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-
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Map
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Locate(cM)
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Link map
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Classical linkage map
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References
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Purnama P.R., Suwanchaikasem P., Junbuathong S., Chotechuen S., Moung-Ngam P., Kasettranan W., Paliyavuth C., Pongpanich M., Roytrakul S., Comai L., Buaboocha T., Chadchawan S.
Sci Rep 2025 15(1) 1443
Uncovering genetic determinants of antioxidant properties in Thai landrace rice through genome-wide association analysis.
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ElShamey E.A., Yang X., Yang J., Pu X., Yang L., Ke C., Zeng Y.
Int J Mol Sci 2025 26(13)
Occurrence, Biosynthesis, and Health Benefits of Anthocyanins in Rice and Barley.
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Mackon E., Jeazet Dongho Epse Mackon GC., Ma Y., Haneef Kashif M., Ali N., Usman B., Liu P.
Biomolecules 2021 11(3)
Recent Insights into Anthocyanin Pigmentation, Synthesis, Trafficking, and Regulatory Mechanisms in Rice (<i>Oryza sativa</i> L.) Caryopsis.
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Mackon E., Ma Y., Jeazet Dongho Epse Mackon GC., Usman B., Zhao Y., Li Q., Liu P.
Genes (Basel) 2021 12(4)
Computational and Transcriptomic Analysis Unraveled <i>OsMATE34</i> as a Putative anthocyanin transporter in Black Rice (<i>Oryza sativa</i> L.) Caryopsis.
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Yang X., Wang J., Xia X., Zhang Z., He J., Nong B., Luo T., Feng R., Wu Y., Pan Y., Xiong F., Zeng Y., Chen C., Guo H., Xu Z., Li D., Deng G.
Plant J. 2021 107(1) 198-214
OsTTG1, a WD40 repeat gene, regulates anthocyanin biosynthesis in rice.
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Kim D.H., Yang J., Ha S.H., Kim J.K., Lee J.Y., Lim S.H.
Front Plant Sci 2021 12 765049
An OsKala3, R2R3 MYB TF, Is a Common Key Player for Black Rice Pericarp as Main Partner of an OsKala4, bHLH TF.
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Oshima M., Taniguchi Y., Akasaka M., Abe K., Ichikawa H., Tabei Y., Tanaka J.
Breed. Sci. 2019 69(2) 244-254
Development of a visible marker trait based on leaf sheath-specific anthocyanin pigmentation applicable to various genotypes in rice.
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Oikawa T., Maeda H., Oguchi T., Yamaguchi T., Tanabe N., Ebana K., Yano M., Ebitani T., Izawa T.
Plant Cell 2015 27(9) 2401-14
The Birth of a Black Rice Gene and Its Local Spread by Introgression.
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Maeda H., Yamaguchi T., Omoteno M., Takarada T., Fujita K., Murata K., Iyama Y., Kojima Y., Morikawa M., Ozaki H., Mukaino N., Kidani Y., Ebitani T.
Breed. Sci. 2014 64(2) 134-41
Genetic dissection of black grain rice by the development of a near isogenic line.
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Shih CH, Chu H, Tang LK, Sakamoto W, Maekawa M, Chu IK, Wang M, Lo C.
Planta. 2008 228(6) 1043-54.
Functional characterization of key structural genes in rice flavonoid biosynthesis.
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Li X, Duan X, Jiang H, Sun Y, Tang Y, Yuan Z, Guo J, Liang W, Chen L, Yin J, Ma H, Wang J, Zhang D.
Plant Physiol. 2006 141(4) 1167-84
Genome-wide analysis of basic/helix-loop-helix transcription factor family in rice and Arabidopsis.
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W Sakamoto, T Ohmori, K Kageyama, C Miyazaki, A Saito, M Murata, K Noda, M Maekawa
Plant Cell Physiol. 2001 42(9) 982-91
The Purple leaf (Pl) locus of rice: the Pl(w) allele has a complex organization and includes two genes encoding basic helix-loop-helix proteins involved in anthocyanin biosynthesis.
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DB Reference
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Gramene ID
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-
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Ontologies
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Gene Ontology
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positive regulation of anthocyanin biosynthetic process( GO:0031542 )
positive regulation of transcription, DNA-dependent( GO:0045893 )
nucleus( GO:0005634 )
response to oxidative stress( GO:0006979 )
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Trait Ontology
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pericarp color( TO:0000707 )
anthocyanin content( TO:0000071 )
oxidative stress( TO:0002657 )
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Plant Ontology
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-
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Related Strains
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Phenotype images
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Last updated
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Oct 15, 2025
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Update info.