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Basic Information
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CGSNL Gene Symbol
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LAX1
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Gene Symbol Synonym
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lax, lax(lx), lx, OsbHLH123, bHLH123, OsLAX1, BOS1, OsBOS1
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CGSNL Gene Name
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LAX PANICLE 1
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Gene Name Synonym
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lax panicle, Transcription factor LAX PANICLE, lax panicle1, basic helix-loop-helix protein 123, LAX PANICLE1, branch one seed 1
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Protein Name
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TRANSCRIPTION FACTOR LAX PANICLE 1
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Allele
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lax-1, lax-2, lax-3, lax-4, lax-5, lax1, lax1-1, lax1-3, lax1-6, bos1-1, lax1-7, lax1-c1, lax1-c2
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Chromosome No.
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1
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Explanation
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lax-1: all lateral spikelets are absent, but fertile terminal spikelets are produced. lax-2: formation of panicle branches and spikekelets is severely reduced. Lateral spilelets are occasionally produced in lax-4 and lax-5. LAX locus is located on chromosome 1 in the region of 82 kb stradding marker C191A. Q7XAQ6. Basic helix-loop-helix (bHLH) transcription factor. AB115668, Axillary meristem formation. orthologue of maize BARRENSTALK1 (BA1). GO:2000904: regulation of starch metabolic process. TO:0000970: panicle density. PO:0030123: panicle inflorescence. TO:0000975: grain width. TO:0003000: stem fresh weight. TO:0003001: stem dry weight. TO:0003021: panicle dry weight. TO:0003020: panicle fresh weight. GO:0090506: axillary shoot meristem initiation. TO:1000024: palea morphology trait.
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Trait Class
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Vegetative organ - Culm
Reproductive organ - Inflorescence
Reproductive organ - panicle
Reproductive organ - Pollination, fertilization, fertility
Character as QTL - Yield and productivity
Reproductive organ - Panicle, Mode of branching
Reproductive organ - Spikelet, flower, glume, awn
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Expression
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Sequence/Locus
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cDNA Accession No.
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AB115668
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MSU ID
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LOC_Os01g61480.1
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RAP ID
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Os01g0831000
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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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Link to INSD Accession List
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Map
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Locate(cM)
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119.0
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Link map
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Classical linkage map
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References
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Hu Q., Zhao Z., Ma L., Xia H., Ma Z., Xu P., Wang X., Zhu R., Zhao Y., Guo H., Zhu X., Zeng Y., Pan Y., Li D., Sun X., Li J., Zhang H., Li Z., Zhang Z.
Nat Commun 2025 16(1) 8848
Natural variation of GNP2 enhances grain number to benefit rice yield.
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Yu L., Yao M., Mao L., Ma T., Nie Y., Ma H., Shao K., An H., Zhao J.
Plant Biotechnol. J. 2023
Rice DSP controls stigma, panicle and tiller primordium initiation.
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Liu X., Deng X., Kong W., Sun T., Li Y.
Int J Mol Sci 2023 24(2)
The Pyramiding of Elite Allelic Genes Related to grain number Increases grain number per Panicle Using the Recombinant Lines Derived from <i>Indica-japonica</i> Cross in Rice.
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Xu T., Fu D., Xiong X., Zhu J., Feng Z., Liu X., Wu C.
PLoS Genet. 2023 19(4) e1010698
OsbHLH067, OsbHLH068, and OsbHLH069 redundantly regulate inflorescence axillary meristem formation in rice.
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Lv Y., Zhang X., Hu Y., Liu S., Yin Y., Wang X.
Front Plant Sci 2023 14 1162828
BOS1 is a basic helix-loop-helix transcription factor involved in regulating panicle development in rice.
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Zheng Y., Fu D., Yang Z.
Rice (N Y) 2023 16(1) 5
OsDPE2 Regulates Rice Panicle Morphogenesis by Modulating the Content of Starch.
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Liu E., Zhu S., Du M., Lyu H., Zeng S., Liu Q., Wu G., Jiang J., Dang X., Dong Z., Hong D.
Gene 2023 883 147635
LAX1, functioning with MADS-box genes, determines normal palea development in rice.
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Kellogg E.A.
Plant Cell 2022 34(7) 2518-2533
Genetic control of branching patterns in grass inflorescences.
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Wang L., Ming L., Liao K., Xia C., Sun S., Chang Y., Wang H., Fu D., Xu C., Wang Z., Li X., Xie W., Ouyang Y., Zhang Q., Li X., Zhang Q., Xiao J., Zhang Q.
Mol Plant 2021 14(7) 1168-1184
Bract suppression regulated by the miR156/529-SPLs-NL1-PLA1 module is required for the transition from vegetative to reproductive branching in rice.
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Yang X., Wang J., Dai Z., Zhao X., Miao X., Shi Z.
Rice (N Y) 2019 12(1) 40
miR156f integrates panicle architecture through genetic modulation of branch number and pedicel length pathways.
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Abbai R., Singh V.K., Nachimuthu V.V., Sinha P., Selvaraj R., Vipparla A.K., Singh A.K., Singh U.M., Varshney R.K., Kumar A.
Plant Biotechnol. J. 2019
Haplotype analysis of key genes governing grain yield and quality traits across 3K RG panel reveals scope for the development of tailor-made rice with enhanced genetic gains.
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Ni S., Li Z., Ying J., Zhang J., Chen H.
Genes (Basel) 2019 10(3)
<i>Decreased Spikelets 4</i> Encoding a Novel Tetratricopeptide Repeat Domain-Containing Protein Is Involved in DNA Repair and spikelet number Determination in Rice.
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Li Y., Li X., Fu D., Wu C.
BMC Plant Biol. 2018 18(1) 348
Panicle Morphology Mutant 1 (PMM1) determines the inflorescence architecture of rice by controlling brassinosteroid biosynthesis.
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Lu H., Dai Z., Li L., Wang J., Miao X., Shi Z.
Front Plant Sci 2017 8 1538
OsRAMOSA2 Shapes Panicle Architecture through Regulating pedicel length.
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Huang X., Yang S., Gong J., Zhao Q., Feng Q., Zhan Q., Zhao Y., Li W., Cheng B., Xia J., Chen N., Huang T., Zhang L., Fan D., Chen J., Zhou C., Lu Y., Weng Q., Han B.
Nature 2016 537(7622) 629-633
Genomic architecture of heterosis for yield traits in rice.
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Deshpande G.M., Ramakrishna K., Chongloi G.L., Vijayraghavan U.
J. Exp. Bot. 2015 66(9) 2773-84
Functions for rice RFL in vegetative axillary meristem specification and outgrowth.
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Wang L., Sun S., Jin J., Fu D., Yang X., Weng X., Xu C., Li X., Xiao J., Zhang Q.
Proc. Natl. Acad. Sci. U.S.A. 2015 112(50) 15504-9
Coordinated regulation of vegetative and reproductive branching in rice.
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Liang W., Shang F., Lin Q., Lou C., Zhang J.
Gene 2014 537(1) 1-5
Tillering and panicle branching genes in rice.
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Gao Z.Y., Zhao S.C., He W.M., Guo L.B., Peng Y.L., Wang J.J., Guo X.S., Zhang X.M., Rao Y.C., Zhang C., Dong G.J., Zheng F.Y., Lu C.X., Hu J., Zhou Q., Liu H.J., Wu H.Y., Xu J., Ni P.X., Zeng D.L., Liu D.H., Tian P., Gong L.H., Ye C., Zhang G.H., Wang J., Tian F.K., Xue D.W., Liao Y., Zhu L., Chen M.S., Li J.Y., Cheng S.H., Zhang G.Y., Wang J., Qian Q.
Proc. Natl. Acad. Sci. U.S.A. 2013 110(35) 14492-7
Dissecting yield-associated loci in super hybrid rice by resequencing recombinant inbred lines and improving parental genome sequences.
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Ikeda M., Miura K., Aya K., Kitano H., Matsuoka M.
Curr. Opin. Plant Biol. 2013 16(2) 213-20
Genes offering the potential for designing yield-related traits in rice.
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Tabuchi,H., Zhang,Y., Hattori,S., Omae,M., Shimizu-Sato,S., Oikawa,T., Qian,Q., Nishimura,M., Kitano,H., Xie,H., Fang,X., Yoshida,H., Kyozuka,J., Chen,F. and Sato,Y.
Plant Cell 2011 23(9) 3276-3287
LAX PANICLE2 of Rice Encodes a Novel Nuclear Protein and Regulates the Formation of Axillary Meristems
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Oikawa T,Kyozuka J
Plant Cell 2009 21 1095-108
Two-Step Regulation of LAX PANICLE1 Protein Accumulation in Axillary Meristem Formation in Rice.
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Furutani I, Sukegawa S, Kyozuka J.
Plant J. 2006 46(3) 503-511
Genome-wide analysis of spatial and temporal gene expression in rice panicle development.
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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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Komatsu,K., Maekawa,M., Ujiie,S., Satake,Y., Furutani,I., Okamoto,H., Shimamoto,K. and Kyozuka,J.
Proc. Natl. Acad. Sci. U.S.A. 2003 100(20) 11765-11770
LAX and SPA: Major regulators of shoot branching in rice.
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Komatsu, M., Maekawa, M., Shimamoto, K. and Kyozuka, J.
Dev. Biol. 2001 231 364-373
The LAX1 and FRIZZY PANICLE 2 genes determine the inflorescence architecture of rice by controlling rachis-branch and spikelet development.
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Yu, Z.H., S.R. McCouch, T. Kinoshita, S. Sato and S.D. Tanksley
Genome 1995 38 566-574.
Association of morphological and RFLP markers in rice (Oryza sativa L. ).
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Causse, M.A., T.M. Fulton, Y.G. Cho, S.N. Ahn, J. Chunwongse, K. Wu, J. Xiao, Z. Yu, P.C. Ronald, S.E. Harrington, G. Second, S.R. McCouch and S.D. Tanksley
Genetics 1994 138 1251-1274.
Saturated molecular map of the rice genome based on an interspecific backcross population.
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Murai, M. and M. Iizawa
Breeding Science 1994 44 247-255.
Effects of major genes controlling morphology of panicle in rice.
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Tanksley, S.D., T.M. Fulton and S.R. McCouch
Genetic Maps, Locus Maps of Complex Genomes, Plants. S.J. O'Brien ed. Cold Spring Harbour Lab. Press. 1993 Book 6 61-79.
Linkage map of rice (Oryza sativa) (2N=24).
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Nadaf, S.K., J.V. Goud and R. Parameswarappa
Indian J. Genet. & Plant Breed. 1992 52(4) 411-415.
Genetic studies in rice (Oryza sativa L.). XVI. Inheritance of panicle type and spreading panicle branch.
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Yu, Z.H., T. Kinoshita, S. Sato and S.D. Tanksley
RGN 1992 9 116-118.
Morphological and RFLP markers are associated in rice.
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Saito, A., M. Yano, N. Kishimoto, M. Nakagahra, A. Yoshimura, K. Saito, S. Kuhara, Y. Ukai, M. Kawase, T. Nagamine, S. Yoshimura, O. Ideta, R. Ohsawa, Y. Hayano, N. Iwata and M. Sugiura
Japan. J. Breed. 1991 41 665-670.
Linkage map of restriction fragment length polymorphism loci in rice.
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Yano, M., A. Saito, A. Yoshimura, S. Kuhara, S. Yoshimura, O. Ikeda, N. Kishimoto, K. Saito, R. Ohsawa, K. Kawase, T. Nagamine, T. Ogawa, M. Nakagahra and N. Iwata
Japan. J. Breed. 1990 40(Suppl. 1) 468-469.
Chromosome identification of rice RFLP linkage groups.
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Iwata, N., H. Satoh and A. Yoshimura
Bull. Inst. Trop. Agr. Kyushu Univ. 1989 12 1-9.
Linkage studies in rice (Oryza sativa L.). Linkage map of chromosome 3.
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Kinoshita, T.
In Biology of Rice. S. Tsunoda and N. Takahashi eds. JSSP/Elsevier, Tokyo. 1984 187-274.
Gene analysis and linkage map.
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Yoshimura, A., N. Iwata and T. Omura
Japan. J. Breed. 1982 32(4) 323-332.
Linkage analysis by reciprocal translocation method in rice plants (Oryza sativa L.). III. Marker genes located on chromosomes 2, 3, 4 and 7.
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Iwata, N., T. Omura and H. Satoh
J. Fac. Agr. Kyushu Univ. 1978 22 243-251.
Linkage studies in rice (Oryza sativa L.). On some mutants for physiological leaf spots.
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Iwata, N., H. Satoh and T. Omura
Japan. J. Breed. 1977 27(Suppl. 1) 250-251.
Linkage studies in rice.Linkage groups for 6 genes newly described.
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Iwata, N. and T. Omura
Japan. J. Breed. 1971 21(1) 19-28.
Linkage analysis by reciprocal translocation method in rice plants (Oryza sativa L).I. Linkage groups corresponding to the chromosome 1, 2, 3 and 4.
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Nagao, S. and M. Takahashi
J. Fac. Agr. Hokkaido Univ. 1963 53(1) 72-130.
Trial construction of twelve linkage groups in Japanese rice. (Genetical studies on rice plant, XXVII).
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DB Reference
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Gramene ID
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GR:0060493
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Ontologies
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Gene Ontology
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DNA binding( GO:0003677 )
transcription( GO:0006350 )
transcription regulator activity( GO:0030528 )
multicellular organismal development( GO:0007275 )
nucleus( GO:0005634 )
regulation of transcription( GO:0045449 )
regulation of inflorescence meristem growth( GO:0010081 )
starch metabolic process( GO:0005982 )
sucrose metabolic process( GO:0005985 )
inflorescence development( GO:0010229 )
response to cytokinin stimulus( GO:0009735 )
response to abscisic acid stimulus( GO:0009737 )
response to brassinosteroid stimulus( GO:0009741 )
response to jasmonic acid stimulus( GO:0009753 )
response to auxin stimulus( GO:0009733 )
floral organ development( GO:0048437 )
floral organ morphogenesis( GO:0048444 )
maintenance of floral organ identity( GO:0048497 )
pollen development( GO:0009555 )
auxin mediated signaling pathway( GO:0009734 )
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Trait Ontology
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flower organ size( TO:0002600 )
flower development trait( TO:0000622 )
sterile lemma length( TO:0000240 )
pollen sterility( TO:0000053 )
spikelet fertility( TO:0000180 )
days to heading( TO:0000137 )
floral organ development trait( TO:0006022 )
internode length( TO:0000145 )
plant height( TO:0000207 )
leaf dry weight( TO:0001014 )
grain yield per plant( TO:0000449 )
1000-seed weight( TO:0000382 )
grain number per plant( TO:0000440 )
seed set percent( TO:0000455 )
grain thickness( TO:0000399 )
grain length( TO:0000734 )
grain size( TO:0000397 )
panicle length( TO:0000040 )
secondary branch number( TO:0000557 )
primary branch number( TO:0000547 )
spikelet anatomy and morphology trait( TO:0000657 )
jasmonic acid sensitivity( TO:0000172 )
abscisic acid sensitivity( TO:0000615 )
brassinosteroid sensitivity( TO:0002677 )
cytokinin sensitivity( TO:0000167 )
auxin sensitivity( TO:0000163 )
yield trait( TO:0000371 )
inflorescence development trait( TO:0000621 )
spikelet density( TO:0000625 )
filled grain number( TO:0000447 )
spikelet number( TO:0000456 )
grain weight( TO:0000590 )
inflorescence branching( TO:0000050 )
panicle number( TO:0000152 )
grain number( TO:0002759 )
panicle type( TO:0000089 )
spikelet weight( TO:0000501 )
spikelet sterility( TO:0000436 )
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Plant Ontology
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inflorescence( PO:0009049 )
spikelet( PO:0009051 )
inflorescence development stage( PO:0001083 )
palea development stage( PO:0001048 )
palea( PO:0009038 )
lemma( PO:0009037 )
sterile lemma( PO:0009040 )
stem internode( PO:0020142 )
stamen( PO:0009029 )
pollen development stage( PO:0001007 )
flower development stage( PO:0007615 )
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Related Strains
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Stocks for Genes
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1
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F Lines
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11
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Phenotype images
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Click to full size image in new window
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Photo from
A. Yoshimura
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Last updated
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Dec 22, 2025
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Update info.