35 matches found in 15 documents. Search time: 0.003 seconds. |
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Score: 9.00 | | Journal: Plant Cell Citation: V : 18 ( 3 ) P : 676-87 Year: 2006 Type: ARTICLE | Literature: oryza Field: abstract Doc ID: pub16489123 Accession (PMID): 16489123 | Abstract: Cytoplasmic male sterility ( CMS ) and nucleus-controlled fertility restoration are widespread plant reproductive features that provide useful tools to exploit heterosis in crops .
However , the molecular mechanism underlying this kind of cytoplasmic-nuclear interaction remains unclear .
Here , we show in rice ( Oryza sativa ) with Boro II cytoplasm that an abnormal mitochondrial open reading frame , orf79 , is cotranscribed with a duplicated atp6 ( B-atp6 ) gene and encodes a cytotoxic peptide .
Expression of orf79 in CMS lines and transgenic rice plants caused gametophytic male sterility .
Immunoblot analysis showed that the ORF79 protein accumulates specifically in microspores .
Two fertility restorer genes , Rf1a and Rf1b , were identified at the classical locus Rf-1 as members of a multigene cluster that encode pentatricopeptide repeat proteins .
RF1A and RF1B are both targeted to mitochondria and can restore male fertility by blocking ORF79 production via endonucleolytic cleavage ( RF1A ) or degradation ( RF1B ) of dicistronic B-atp6/orf79 mRNA .
In the presence of both restorers , RF1A was epistatic over RF1B in the mRNA processing .
We have also shown that RF1A plays an additional role in promoting the editing of atp6 mRNAs , independent of its cleavage function . | Matching Sentences: [ Sen. 7, subscore: 4.00 ]: RF1A and RF1B are both targeted to mitochondria and can restore male fertility by blocking ORF79 production via endonucleolytic cleavage ( RF1A ) or degradation ( RF1B ) of dicistronic B-atp6/orf79 mRNA . [ Sen. 6, subscore: 2.00 ]: Two fertility restorer genes , Rf1a and Rf1b , were identified at the classical locus Rf-1 as members of a multigene cluster that encode pentatricopeptide repeat proteins . [ Sen. 8, subscore: 2.00 ]: In the presence of both restorers , RF1A was epistatic over RF1B in the mRNA processing . [ Sen. 9, subscore: 1.00 ]: We have also shown that RF1A plays an additional role in promoting the editing of atp6 mRNAs , independent of its cleavage function .
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Score: 8.00 | | Journal: Citation: V : ( ) P : Year: 2006 Type: ARTICLE | Literature: oryza Field: abstract Doc ID: pub17086445 Accession (PMID): 17086445 | Abstract: The CW-cytoplasmic male sterility ( CMS ) line has the cytoplasm of Oryza rufipogon Griff , and mature pollen is morphologically normal under an optical microscope but lacks the ability to germinate ; restorer gene Rf17 has been identified as restoring this ability .
The difference between nuclear gene expression in mature anthers was compared for the CW-CMS line , [ cms-CW ] rf17rf17 , and a maintainer line with normal cytoplasm of Oryza sativa L , [ normal ] rf17rf17 .
Using a 22-k rice oligoarray we detected 58 genes that were up-regulated more than threefold in the CW-CMS line .
Expression in other organs was further investigated for 20 genes using RT-PCR .
Five genes , including genes for alternative oxidase , were found to be preferentially expressed in [ cms-CW ] rf17rf17 but not in [ normal ] rf17rf17 or [ cms-CW ] Rf17Rf17 .
Such [ cms-CW ] rf17rf17-specific gene expression was only observed in mature anthers but not in leaves , stems , or roots , indicating the presence of anther-specific mitochondrial retrograde regulation of nuclear gene expression , and that Rf17 has a role in restoring the ectopic gene expression .
We also used a proteomic approach to discover the retrograde regulated proteins and identified six proteins that were accumulated differently .
These results reveal organ-specific induced mitochondrial retrograde pathways affecting nuclear gene expression possibly related to CMS . | Matching Sentences: [ Sen. 5, subscore: 3.00 ]: Five genes , including genes for alternative oxidase , were found to be preferentially expressed in [ cms-CW ] rf17rf17 but not in [ normal ] rf17rf17 or [ cms-CW ] Rf17Rf17 . [ Sen. 2, subscore: 2.00 ]: The difference between nuclear gene expression in mature anthers was compared for the CW-CMS line , [ cms-CW ] rf17rf17 , and a maintainer line with normal cytoplasm of Oryza sativa L , [ normal ] rf17rf17 . [ Sen. 6, subscore: 2.00 ]: Such [ cms-CW ] rf17rf17-specific gene expression was only observed in mature anthers but not in leaves , stems , or roots , indicating the presence of anther-specific mitochondrial retrograde regulation of nuclear gene expression , and that Rf17 has a role in restoring the ectopic gene expression . [ Sen. 1, subscore: 1.00 ]: The CW-cytoplasmic male sterility ( CMS ) line has the cytoplasm of Oryza rufipogon Griff , and mature pollen is morphologically normal under an optical microscope but lacks the ability to germinate ; restorer gene Rf17 has been identified as restoring this ability .
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Score: 4.00 | | Journal: Theor . Appl . Genet . Citation: V : 111 ( 6 ) P : 994-1012 Year: 2005 Type: ARTICLE | Literature: oryza Field: abstract Doc ID: pub16078015 Accession (PMID): 16078015 | Abstract: With an aim to clone the sorghum fertility restorer gene Rf1 , a high-resolution genetic and physical map of the locus was constructed .
The Rf1 locus was resolved to a 32-kb region spanning four open reading frames : a plasma membrane Ca ( 2+ ) -ATPase , a cyclin D-1 , an unknown protein , and a pentatricopeptide repeat ( PPR13 ) gene family member .
An approximately 19-kb region spanning the cyclin D-1 and unknown protein genes was completely conserved between sterile and fertile plants as was the sequence spanning the coding region of the Ca ( 2+ ) -ATPase .
In contrast , 19 sequence polymorphisms were located in an approximately 7-kb region spanning PPR13 , and all markers cosegregated with the fertility restoration phenotype .
PPR13 was predicted to encode a mitochondrial-targeted protein containing a single exon with 14 PPR repeats , and the protein is classified as an E-type PPR subfamily member .
To permit sequence-based comparison of the sorghum and rice genomes in the Rf1 region , 0 . 53 Mb of sorghum chromosome 8 was sequenced and compared to the colinear region of rice chromosome 12 .
Genome comparison revealed a mosaic pattern of colinearity with an approximately 275-kb gene-poor region with little gene conservation and an adjacent , approximately 245-kb gene-rice region that is more highly conserved between rice and sorghum .
Despite being located in a region of high gene conservation , sorghum PPR13 was not located in a colinear position on rice chromosome 12 .
The present results suggest that sorghum PPR13 represents a potential candidate for the sorghum Rf1 gene , and its presence in the sorghum genome indicates a single gene transposition event subsequent to the divergence of rice and sorghum ancestors . | Matching Sentences: [ Sen. 1, subscore: 1.00 ]: With an aim to clone the sorghum fertility restorer gene Rf1 , a high-resolution genetic and physical map of the locus was constructed . [ Sen. 2, subscore: 1.00 ]: The Rf1 locus was resolved to a 32-kb region spanning four open reading frames : a plasma membrane Ca ( 2+ ) -ATPase , a cyclin D-1 , an unknown protein , and a pentatricopeptide repeat ( PPR13 ) gene family member . [ Sen. 6, subscore: 1.00 ]: To permit sequence-based comparison of the sorghum and rice genomes in the Rf1 region , 0 . 53 Mb of sorghum chromosome 8 was sequenced and compared to the colinear region of rice chromosome 12 . [ Sen. 9, subscore: 1.00 ]: The present results suggest that sorghum PPR13 represents a potential candidate for the sorghum Rf1 gene , and its presence in the sorghum genome indicates a single gene transposition event subsequent to the divergence of rice and sorghum ancestors .
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Score: 4.00 | | Journal: Plant Cell Rep Citation: V : 28 P : 233-9 Year: 2009 Type: MEDLINE | Literature: oryza Field: abstract Doc ID: pub18956194 Accession (PMID): 18956194 | Abstract: Rice with LD-type cytoplasmic male sterility ( CMS ) possesses the cytoplasm of Lead Rice and its fertility is recovered by a nuclear fertility restorer gene Rf1 .
Rf1 promotes processing of a CMS-associated mitochondrial RNA of atp6-orf79 , which consists of atp6 and orf79 , in BT-CMS with the cytoplasm of Chinsurah Boro II .
In this study , we found that LD-cytoplasm contained a sequence variant of orf79 downstream of atp6 .
Northern blot analysis showed that atp6-orf79 RNA of LD-cytoplasm was co-transcribed and was processed in the presence of Rf1 in the same manner as in BT-cytoplasm .
Western blot analysis showed that the ORF79 peptide did not accumulate in an LD-CMS line , while ORF79 accumulated in a BT-CMS line and was diminished by Rf1 .
These results suggest that accumulation of ORF79 is not the cause of CMS in LD-cytoplasm and the mechanism of male-sterility induction/fertility restoration in LD-CMS is different from that in BT-CMS .
| Matching Sentences: [ Sen. 1, subscore: 1.00 ]: Rice with LD-type cytoplasmic male sterility ( CMS ) possesses the cytoplasm of Lead Rice and its fertility is recovered by a nuclear fertility restorer gene Rf1 . [ Sen. 2, subscore: 1.00 ]: Rf1 promotes processing of a CMS-associated mitochondrial RNA of atp6-orf79 , which consists of atp6 and orf79 , in BT-CMS with the cytoplasm of Chinsurah Boro II . [ Sen. 4, subscore: 1.00 ]: Northern blot analysis showed that atp6-orf79 RNA of LD-cytoplasm was co-transcribed and was processed in the presence of Rf1 in the same manner as in BT-cytoplasm . [ Sen. 5, subscore: 1.00 ]: Western blot analysis showed that the ORF79 peptide did not accumulate in an LD-CMS line , while ORF79 accumulated in a BT-CMS line and was diminished by Rf1 .
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Score: 4.00 | | Journal: Plant Cell Rep Citation: V : 29 P : 359-69 Year: 2010 Type: MEDLINE | Literature: oryza Field: abstract Doc ID: pub20195612 Accession (PMID): 20195612 | Abstract: BT-type cytoplasmic male sterility ( CMS ) in rice is associated with accumulation of unprocessed dicistronic RNA containing a duplicated atp6 ( B-atp6 ) and an unusual open reading frame , orf79 , encoding a cytotoxic peptide in mitochondria .
The male-sterile state of BT-type CMS is stably maintained by backcrossing the plants with line Taichung 65 ( T65 ) that has no restorer gene and is completely suppressed by the presence of the Rf1 gene through the processing of B-atp6-orf79 RNA .
A variant of the T65 line , T65 ( T ) , has a weak restoration function conferred by the Ifr1 gene , which is genetically independent of the Rf1 gene .
However , not much is known about the mechanism ( s ) .
In a study to examine whether the mechanism involved in fertility restoration by Ifr1 is analogous to restoration mediated by Rf1 , the transcript profile of B-atp6-orf79 in male-sterile plants was compared with that in fertility restored plants obtained by crossing male-sterile plants with T65 ( T ) .
The cellular level of unprocessed B-atp6-orf79 RNA was reduced in the restored plants , but no change in processing efficiency or the quantity of B-atp6-orf79 DNA was detected .
These results suggest that Ifr1 restores fertility through reducing either the transcription rate of B-atp6-orf79 or the stability of its primary transcripts , a mechanism distinct from that involved in fertility restoration of BT-type CMS by Rf1 .
| Matching Sentences: [ Sen. 2, subscore: 1.00 ]: The male-sterile state of BT-type CMS is stably maintained by backcrossing the plants with line Taichung 65 ( T65 ) that has no restorer gene and is completely suppressed by the presence of the Rf1 gene through the processing of B-atp6-orf79 RNA . [ Sen. 3, subscore: 1.00 ]: A variant of the T65 line , T65 ( T ) , has a weak restoration function conferred by the Ifr1 gene , which is genetically independent of the Rf1 gene . [ Sen. 5, subscore: 1.00 ]: In a study to examine whether the mechanism involved in fertility restoration by Ifr1 is analogous to restoration mediated by Rf1 , the transcript profile of B-atp6-orf79 in male-sterile plants was compared with that in fertility restored plants obtained by crossing male-sterile plants with T65 ( T ) . [ Sen. 7, subscore: 1.00 ]: These results suggest that Ifr1 restores fertility through reducing either the transcription rate of B-atp6-orf79 or the stability of its primary transcripts , a mechanism distinct from that involved in fertility restoration of BT-type CMS by Rf1 .
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