| 21 matches found in 9 documents. Search time: 0.575 seconds. |
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Score: 7.00 |
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| Title: The gene FLORAL ORGAN NUMBER1 regulates floral meristem size in rice and encodes a leucine-rich repeat receptor kinase orthologous to Arabidopsis CLAVATA1 .
| | Author: Suzaki T Sato M Ashikari M Miyoshi M Nagato Y Hirano HY .
| | Journal: Development Citation: V : 131 ( 22 ) P : 5649-57 Year: 2004 Type: ARTICLE | | Literature: oryza Field: abstract Doc ID: pub15509765 Accession (PMID): 15509765 | | Abstract: The regulation of floral organ number is closely associated with floral meristem size .
Mutations in the gene FLORAL ORGAN NUMBER1 ( FON1 ) cause enlargement of the floral meristem in Oryza sativa ( rice ) , resulting in an increase in the number of all floral organs .
Ectopic floral organs develop in the whorl of each organ and/or in the additional whorls that form .
Inner floral organs are more severely affected than outer floral organs .
Many carpel primordia develop indeterminately , and undifferentiated meristematic it issues remain in the center in almost-mature flowers .
Consistent with this result , OSH1 , a molecular marker of meristematic indeterminate cells in rice , continues to be expressed in this region .
Although floral meristems are strongly affected by the fon1-2 mutation , vegetative and inflorescence meristems are largely normal , even in this strong allele .
We isolated the FON1 gene by positional cloning and found that it encodes a leucine-rich repeat receptor-like kinase most similar to CLAVATA1 ( CLV1 ) in Arabidopsis thaliana .
This suggests that a pathway similar to the CLV signaling system that regulates meristem maintenance in Arabidopsis is conserved in the grass family .
Unlike CLV1 , which is predominantly expressed in the L3 layer of the shoot meristem , FON1 is expressed throughout the whole floral meristem , suggesting that small modifications to the CLV signaling pathway may be required to maintain the floral meristem in rice .
In addition , FON1 transcripts are detected in all meristems responsible for development of the aerial part of rice , suggesting that genes sharing functional redundancy with FON1 act in the vegetative and inflorescence meristems to mask the effects of the fon1 mutation . | Matching Sentences:
[ Sen. 11, subscore: 3.00 ]: In addition , FON1 transcripts are detected in all meristems responsible for development of the aerial part of rice , suggesting that genes sharing functional redundancy with FON1 act in the vegetative and inflorescence meristems to mask the effects of the fon1 mutation .
[ Sen. 2, subscore: 1.00 ]: Mutations in the gene FLORAL ORGAN NUMBER1 ( FON1 ) cause enlargement of the floral meristem in Oryza sativa ( rice ) , resulting in an increase in the number of all floral organs .
[ Sen. 7, subscore: 1.00 ]: Although floral meristems are strongly affected by the fon1-2 mutation , vegetative and inflorescence meristems are largely normal , even in this strong allele .
[ Sen. 8, subscore: 1.00 ]: We isolated the FON1 gene by positional cloning and found that it encodes a leucine-rich repeat receptor-like kinase most similar to CLAVATA1 ( CLV1 ) in Arabidopsis thaliana .
[ Sen. 10, subscore: 1.00 ]: Unlike CLV1 , which is predominantly expressed in the L3 layer of the shoot meristem , FON1 is expressed throughout the whole floral meristem , suggesting that small modifications to the CLV signaling pathway may be required to maintain the floral meristem in rice .
| | Supplemental links/files: reference in endnote online text related articles pubmed citation | |
Score: 7.00 |
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| Title: The rice FON1 gene controls vegetative and reproductive development by regulating shoot apical meristem size .
| | Author: Moon S Jung KH Lee DE Lee DY Lee J An K Kang HG An G | | Journal: Mol .
Cells Citation: V : 21 ( 1 ) P : 147-52 Year: 2006 Type: ARTICLE | | Literature: oryza Field: abstract Doc ID: pub16511358 Accession (PMID): 16511358 | | Abstract: Most plant organs develop from meristems .
Rice FON1 , which is an ortholog of Clv1 , regulates stem cell proliferation and organ initiation .
The point muta-tions , fon1-1 and fon1-2 , disrupt meristem balance , resulting in alteration of floral organ numbers and the architecture of primary rachis branches .
In this study , we identified two knockout alleles , fon1-3 and fon1-4 , generated by T-DNA and Tos17 insertion , respectively .
Unlike the previously isolated point mutants , the null mutants have alterations not only of the reproductive organs but also of vegetative it issues , producing fewer tillers and secondary rachis branches .
The mutant plants are semi-dwarfs due to delayed leaf emergence , and leaf senescence is delayed .
SEM analysis showed that the shoot apical meristems of fon1-3 mutants are enlarged .
These results indicate that FON1 controls vegetative as well as reproductive development by regulating meristem size . | Matching Sentences:
[ Sen. 3, subscore: 2.00 ]: The point muta-tions , fon1-1 and fon1-2 , disrupt meristem balance , resulting in alteration of floral organ numbers and the architecture of primary rachis branches .
[ Sen. 4, subscore: 2.00 ]: In this study , we identified two knockout alleles , fon1-3 and fon1-4 , generated by T-DNA and Tos17 insertion , respectively .
[ Sen. 2, subscore: 1.00 ]: Rice FON1 , which is an ortholog of Clv1 , regulates stem cell proliferation and organ initiation .
[ Sen. 7, subscore: 1.00 ]: SEM analysis showed that the shoot apical meristems of fon1-3 mutants are enlarged .
[ Sen. 8, subscore: 1.00 ]: These results indicate that FON1 controls vegetative as well as reproductive development by regulating meristem size .
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Score: 3.00 |
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| Title: Identification of active transposon dTok , a member of the hAT family , in rice .
| | Author: Moon S Jung KH Lee DE Jiang WZ Koh HJ Heu MH Lee DS Suh HS An G | | Journal: Plant Cell Physiol .
Citation: V : 47 ( 11 ) P : 1473-83 Year: 2006 Type: ARTICLE | | Literature: oryza Field: abstract Doc ID: pub16990289 Accession (PMID): 16990289 | | Abstract: Recent completion of the sequencing of the rice genome has revealed that it contains >40% repetitive sequences , most of which are related to inactive transposable elements .
During the molecular analysis of the floral organ number 1/multiple pistil 2 ( fon1/mp2 ) mutant , we identified an active transposable element dTok0 that was inserted at the kinase domain of FON1 , a homolog of CLAVATA1 .
Insertion of the element into FON1 generated an 8 bp duplication of its target sites , which is one of the major characteristics of the hAT family of transposons .
The dTok0 element was actively transposed out of the FON1 gene , leaving 5-8 bp footprints .
Reinsertion into a new location was observed at a low frequency .
Analysis of the genome sequence showed that the rice cultivar Nipponbare contains 25 copies of dTok elements ; similar numbers were present in all the Oryza species examined .
Because dTok0 does not encode a transposase , enzyme activity should be provided in trans .
We identified a putative autonomous transposon , Tok1 that contains an intact open reading frame of the Ac-like transposase .
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[ Sen. 2, subscore: 1.00 ]: During the molecular analysis of the floral organ number 1/multiple pistil 2 ( fon1/mp2 ) mutant , we identified an active transposable element dTok0 that was inserted at the kinase domain of FON1 , a homolog of CLAVATA1 .
[ Sen. 3, subscore: 1.00 ]: Insertion of the element into FON1 generated an 8 bp duplication of its target sites , which is one of the major characteristics of the hAT family of transposons .
[ Sen. 4, subscore: 1.00 ]: The dTok0 element was actively transposed out of the FON1 gene , leaving 5-8 bp footprints .
| | Supplemental links/files: reference in endnote online text related articles pubmed citation | |
Score: 3.00 |
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| Title: Conservation and Diversification of Meristem Maintenance Mechanism in Oryza sativa : Function of the FLORAL ORGAN NUMBER2 Gene .
| | Author: Suzaki T Toriba T Fujimoto M Tsutsumi N Kitano H Hirano HY .
| | Journal: Plant Cell Physiol .
Citation: V : 47 ( 12 ) P : 1591-602 Year: 2006 Type: ARTICLE | | Literature: oryza Field: abstract Doc ID: pub17056620 Accession (PMID): 17056620 | | Abstract: To elucidate the genetic mechanism that regulates meristem maintenance in monocots , here we have examined the function of the gene FLORAL ORGAN NUMBER2 ( FON2 ) in Oryza sativa ( rice ) .
Mutations in FON2 cause enlargement of the floral meristem , resulting in an increase in the number of floral organs , although the vegetative and inflorescence meristems are largely normal Molecular cloning reveals that FON2 encodes a small secreted protein , containing a CLE domain , that is closely related to CLAVATA3 in Arabidopsis thaliana .
FON2 transcripts are localized at the apical region in all meristems in the aerial parts of rice plants , showing an expression pattern similar to that of Arabidopsis CLV3 .
Constitutive expression of FON2 causes a reduction in the number of floral organs and flowers , suggesting that both the flower and inflorescence meristems are reduced in size .
This action of FON2 requires the function of FON1 , an ortholog of CLV1 .
Constitutive expression of FON2 also causes premature termination of the shoot apical meristem in Arabidopsis , a phenotype similar to that caused by constitutive expression of CLV3 .
Together with our previous study of FON1 , these results clearly indicate that the FON1-FON2 system in rice corresponds to the CLV signaling system in Arabidopsis and suggest that the negative regulation of stem cell identity by these systems may be principally conserved in a wide range of plants within the Angiosperms .
In addition , we propose a model of the genetic regulation of meristem maintenance in rice that includes an alternative pathway independent of FON2-FON1 . | Matching Sentences:
[ Sen. 7, subscore: 2.00 ]: Together with our previous study of FON1 , these results clearly indicate that the FON1-FON2 system in rice corresponds to the CLV signaling system in Arabidopsis and suggest that the negative regulation of stem cell identity by these systems may be principally conserved in a wide range of plants within the Angiosperms .
[ Sen. 5, subscore: 1.00 ]: This action of FON2 requires the function of FON1 , an ortholog of CLV1 .
| | Supplemental links/files: reference in endnote online text related articles pubmed citation | |
Score: 2.00 |
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| Title: The shoot stem cell niche in angiosperms : expression patterns of WUS orthologues in rice and maize imply major modifications in the course of mono and dicot evolution .
| | Author: Nardmann J Werr W | | Journal: Mol . Biol . Evol Citation: V : 23 ( 12 ) P : 2492-504 Year: 2006 Type: ARTICLE | | Literature: oryza Field: abstract Doc ID: pub16987950 Accession (PMID): 16987950 | | Abstract: In Arabidopsis , stem cell homeostasis in the shoot apical meristem ( SAM ) is controlled by a feedback loop between WUS and CLV functions .
We have identified WUS orthologues in maize and rice by a detailed phylogenetic analysis of the WOX gene family and subsequent cloning .
A single WUS orthologue is present in the rice genome ( OsWUS ) , whereas the allotetraploid maize genome contains 2 WUS paralogues ( ZmWUS1 and ZmWUS2 ) .
None of the isolated grass WUS orthologues displays an organizing center-type expression pattern in the vegetative SAM as in Arabidopsis .
In contrast , the grass-specific expression patterns relate to the specification of new phytomers consistent with the transcriptional expression patterns of TD1 and FON1 ( CLV1 orthologues of maize and rice , respectively ) .
Moreover , the grass WUS and CLV1 orthologues are coexpressed in all reproductive meristems , where fasciation and supernumerary floral organs occur in td1 or fon1 loss-of-function mutants .
The expression patterns of WUS orthologues in both grass species compared with those of dicots imply that major changes in WUS function , which are correlated with changes in CLV1 signaling , have occurred during angiosperm evolution and raise doubts about the uniqueness of the WUS/CLV antagonism in the maintenance of the shoot stem cell niche in grasses .
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[ Sen. 5, subscore: 1.00 ]: In contrast , the grass-specific expression patterns relate to the specification of new phytomers consistent with the transcriptional expression patterns of TD1 and FON1 ( CLV1 orthologues of maize and rice , respectively ) .
[ Sen. 6, subscore: 1.00 ]: Moreover , the grass WUS and CLV1 orthologues are coexpressed in all reproductive meristems , where fasciation and supernumerary floral organs occur in td1 or fon1 loss-of-function mutants .
| | Supplemental links/files: reference in endnote online text related articles pubmed citation | |
