| 18 matches found in 5 documents. Search time: 2.048 seconds. |
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Score: 8.00 |
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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. 2, subscore: 2.00 ]: 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 .
[ Sen. 1, subscore: 1.00 ]: 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 ) .
[ Sen. 3, subscore: 1.00 ]: 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 .
[ Sen. 4, subscore: 1.00 ]: 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 .
[ Sen. 5, subscore: 1.00 ]: This action of FON2 requires the function of FON1 , an ortholog of CLV1 .
[ Sen. 6, subscore: 1.00 ]: 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 .
[ Sen. 8, subscore: 1.00 ]: In addition , we propose a model of the genetic regulation of meristem maintenance in rice that includes an alternative pathway independent of FON2-FON1 .
| | Supplemental links/files: reference in endnote online text related articles pubmed citation | |
Score: 7.00 |
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| Title: FON2 SPARE1 redundantly regulates floral meristem maintenance with FLORAL ORGAN NUMBER2 in rice .
| | Author: Suzaki T Ohneda M Toriba T Yoshida A Hirano HY | | Journal: PLoS Genet Citation: V : 5 P : e1000693 Year: 2009 Type: MEDLINE | | Literature: oryza Field: abstract Doc ID: pub19834537 Accession (PMID): 19834537 | | Abstract: CLAVATA signaling restricts stem cell identity in the shoot apical meristem ( SAM ) in Arabidopsis thaliana .
In rice ( Oryza sativa ) , FLORAL ORGAN NUMBER2 ( FON2 ) , closely related to CLV3 , is involved as a signaling molecule in a similar pathway to negatively regulate stem cell proliferation in the floral meristem ( FM ) .
Here we show that the FON2 SPARE1 ( FOS1 ) gene encoding a CLE protein functions along with FON2 in maintenance of the FM .
In addition , FOS1 appears to be involved in maintenance of the SAM in the vegetative phase , because constitutive expression of FOS1 caused termination of the vegetative SAM .
Genetic analysis revealed that FOS1 does not need FON1 , the putative receptor of FON2 , for its action , suggesting that FOS1 and FON2 may function in meristem maintenance as signaling molecules in independent pathways .
Initially , we identified FOS1 as a suppressor that originates from O sativa indica and suppresses the fon2 mutation in O sativa japonica .
FOS1 function in japonica appears to be compromised by a functional nucleotide polymorphism ( FNP ) at the putative processing site of the signal peptide .
Sequence comparison of FOS1 in about 150 domesticated rice and wild rice species indicates that this FNP is present only in japonica , suggesting that redundant regulation by FOS1 and FON2 is commonplace in species in the Oryza genus .
Distribution of the FNP also suggests that this mutation may have occurred during the divergence of japonica from its wild ancestor .
Stem cell maintenance may be regulated by at least three negative pathways in rice , and each pathway may contribute differently to this regulation depending on the type of the meristem .
This situation contrasts with that in Arabidopsis , where CLV signaling is the major single pathway in all meristems .
| Matching Sentences:
[ Sen. 3, subscore: 2.00 ]: Here we show that the FON2 SPARE1 ( FOS1 ) gene encoding a CLE protein functions along with FON2 in maintenance of the FM .
[ Sen. 5, subscore: 2.00 ]: Genetic analysis revealed that FOS1 does not need FON1 , the putative receptor of FON2 , for its action , suggesting that FOS1 and FON2 may function in meristem maintenance as signaling molecules in independent pathways .
[ Sen. 2, subscore: 1.00 ]: In rice ( Oryza sativa ) , FLORAL ORGAN NUMBER2 ( FON2 ) , closely related to CLV3 , is involved as a signaling molecule in a similar pathway to negatively regulate stem cell proliferation in the floral meristem ( FM ) .
[ Sen. 6, subscore: 1.00 ]: Initially , we identified FOS1 as a suppressor that originates from O sativa indica and suppresses the fon2 mutation in O sativa japonica .
[ Sen. 8, subscore: 1.00 ]: Sequence comparison of FOS1 in about 150 domesticated rice and wild rice species indicates that this FNP is present only in japonica , suggesting that redundant regulation by FOS1 and FON2 is commonplace in species in the Oryza genus .
| | Supplemental links/files: reference in endnote online text related articles pubmed citation | |
Score: 5.00 |
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| Title: Functional Diversification of CLAVATA3-Related CLE Proteins in Meristem Maintenance in Rice .
| | Author: Suzaki T Yoshida A Hirano HY | | Journal: Plant Cell Citation: V : P : Year: 2008 Type: Publisher | | Literature: oryza Field: abstract Doc ID: pub18676878 Accession (PMID): 18676878 | | Abstract: Postembryonic development in plants depends on the activity of the shoot apical meristem ( SAM ) and root apical meristem ( RAM ) .
In Arabidopsis thaliana , CLAVATA signaling negatively regulates the size of the stem cell population in the SAM by repressing WUSCHEL .
In other plants , however , studies of factors involved in stem cell maintenance are insufficient .
Here , we report that two proteins closely related to CLAVATA3 , FLORAL ORGAN NUMBER2 ( FON2 ) and FON2-LIKE CLE PROTEIN1 ( FCP1/OsCLE402 ) , have functionally diversified to regulate the different types of meristem in rice ( Oryza sativa ) .
Unlike FON2 , which regulates the maintenance of flower and inflorescence meristems , FCP1 appears to regulate the maintenance of the vegetative SAM and RAM .
Constitutive expression of FCP1 results in consumption of the SAM in the vegetative phase , and application of an FCP1 CLE peptide in vitro disturbs root development by misspecification of cell fates in the RAM .
FON1 , a putative receptor of FON2 , is likely to be unnecessary for these FCP1 functions .
Furthermore , we identify a key amino acid residue that discriminates between the actions of FCP1 and FON2 .
Our results suggest that , although the basic framework of meristem maintenance is conserved in the angiosperms , the functions of the individual factors have diversified during evolution .
| Matching Sentences:
[ Sen. 4, subscore: 2.00 ]: Here , we report that two proteins closely related to CLAVATA3 , FLORAL ORGAN NUMBER2 ( FON2 ) and FON2-LIKE CLE PROTEIN1 ( FCP1/OsCLE402 ) , have functionally diversified to regulate the different types of meristem in rice ( Oryza sativa ) .
[ Sen. 5, subscore: 1.00 ]: Unlike FON2 , which regulates the maintenance of flower and inflorescence meristems , FCP1 appears to regulate the maintenance of the vegetative SAM and RAM .
[ Sen. 7, subscore: 1.00 ]: FON1 , a putative receptor of FON2 , is likely to be unnecessary for these FCP1 functions .
[ Sen. 8, subscore: 1.00 ]: Furthermore , we identify a key amino acid residue that discriminates between the actions of FCP1 and FON2 .
| | Supplemental links/files: reference in endnote online text related articles pubmed citation | |
Score: 2.00 |
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| Title: Gypsy embryo specifies ovule curvature by regulating ovule/integument development in rice .
| | Author: Yamaki S Satoh H Nagato Y | | Journal: Planta Citation: V : 222 ( 3 ) P : 408-17 Year: 2005 Type: ARTICLE | | Literature: oryza Field: abstract Doc ID: pub16001259 Accession (PMID): 16001259 | | Abstract: The embryo position in a seed is stable in most plant species , indicating the existence of a strict regulatory mechanism that specifies the embryo position in the seed .
To elucidate this mechanism , we analyzed the gypsy embryo ( gym ) mutant of rice , in which the position of the mature embryo in the seed is altered at a low frequency .
Analyses of early embryogenesis and ovule development showed that the ectopic embryo was derived from an ill-positioned egg cell , which resulted from the incomplete curvature of the ovule .
Although the development of both the inner and outer integuments was impaired , the ovule curvature was associated closely with the extent of inner integument growth .
Therefore , inner integument development controls ovule curvature in rice .
The expression patterns of OSH1 and OsMADS13 indicated that , in gym , a small number of indeterminate cells are maintained on the style side of the ovule and then in the integument primordium at a low frequency .
The prolonged survival of these indeterminate cells disturbs normal integument development .
The gym fon2 double mutant suggests that GYM and FON2 are involved redundantly in floral meristem determinacy .
Possible functions of the GYM gene and the ovule developmental mechanism are discussed . | Matching Sentences:
[ Sen. 8, subscore: 2.00 ]: The gym fon2 double mutant suggests that GYM and FON2 are involved redundantly in floral meristem determinacy .
| | Supplemental links/files: reference in endnote online text related articles pubmed citation | |
Score: 1.00 |
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| Title: FON2 SPARE1 redundantly regulates floral meristem maintenance with FLORAL ORGAN NUMBER2 in rice .
| | Author: Suzaki T Ohneda M Toriba T Yoshida A Hirano HY | | Journal: PLoS Genet Citation: V : 5 P : e1000693 Year: 2009 Type: MEDLINE | | Literature: oryza Field: title Doc ID: pub19834537 Accession (PMID): 19834537 | | Abstract: CLAVATA signaling restricts stem cell identity in the shoot apical meristem ( SAM ) in Arabidopsis thaliana .
In rice ( Oryza sativa ) , FLORAL ORGAN NUMBER2 ( FON2 ) , closely related to CLV3 , is involved as a signaling molecule in a similar pathway to negatively regulate stem cell proliferation in the floral meristem ( FM ) .
Here we show that the FON2 SPARE1 ( FOS1 ) gene encoding a CLE protein functions along with FON2 in maintenance of the FM .
In addition , FOS1 appears to be involved in maintenance of the SAM in the vegetative phase , because constitutive expression of FOS1 caused termination of the vegetative SAM .
Genetic analysis revealed that FOS1 does not need FON1 , the putative receptor of FON2 , for its action , suggesting that FOS1 and FON2 may function in meristem maintenance as signaling molecules in independent pathways .
Initially , we identified FOS1 as a suppressor that originates from O sativa indica and suppresses the fon2 mutation in O sativa japonica .
FOS1 function in japonica appears to be compromised by a functional nucleotide polymorphism ( FNP ) at the putative processing site of the signal peptide .
Sequence comparison of FOS1 in about 150 domesticated rice and wild rice species indicates that this FNP is present only in japonica , suggesting that redundant regulation by FOS1 and FON2 is commonplace in species in the Oryza genus .
Distribution of the FNP also suggests that this mutation may have occurred during the divergence of japonica from its wild ancestor .
Stem cell maintenance may be regulated by at least three negative pathways in rice , and each pathway may contribute differently to this regulation depending on the type of the meristem .
This situation contrasts with that in Arabidopsis , where CLV signaling is the major single pathway in all meristems .
| Matching Sentences:
[ Sen. 1, subscore: 1.00 ]: FON2 SPARE1 redundantly regulates floral meristem maintenance with FLORAL ORGAN NUMBER2 in rice .
| | Supplemental links/files: reference in endnote online text related articles pubmed citation | |
