| 33 matches found in 18 documents. Search time: 0.283 seconds. |
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Score: 8.00 |
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| Title: Genetic interactions involved in the inhibition of heading by heading date QTL , Hd2 in rice under long-day conditions .
| | Author: Shibaya T Nonoue Y Ono N Yamanouchi U Hori K Yano M | | Journal: Theor Appl Genet Citation: V : 123 P : 1133-43 Year: 2011 Type: In-Process | | Literature: oryza Field: abstract Doc ID: pub21789706 Accession (PMID): 21789706 | | Abstract: Heading date is the one of the most important traits in rice breeding , because it defines where rice can be cultivated and influences the expression of various agronomic traits .
To examine the inhibition of heading by Heading date 2 ( Hd2 ) , previously detected on the distal end of chromosome 7s long arm by quantitative trait locus ( QTL ) analysis , we developed backcross inbred lines ( BILs ) from Koshihikari , a leading Japanese cultivar , and Hayamasari , an extremely early heading cultivar .
The BILs were cultivated under natural field conditions in Tsukuba Japan , and under long-day ( 14 . 5 h ) , extremely long-day ( 18 h ) , and short-day ( 10 h ) conditions .
Combinations of several QTLs near Hd1 , Hd2 , Ghd7 , Hd5 , and Hd16 were detected under these four conditions .
Analysis of advanced backcross progenies revealed genetic interactions between Hd2 and Hd16 and between Hd2 and Ghd7 .
In the homozygous Koshihikari genetic background at Hd16 , inhibition of heading by the Koshihikari allele at Hd2 was smaller than that with the Hayamasari Hd16 allele .
Similarly , in the homozygous Koshihikari genetic background at Ghd7 , the difference in heading date caused by different alleles at Hd2 was smaller than in plants homozygous for the Hayamasari Ghd7 allele .
Based on these results , we conclude that Hd2 and its genetic interactions play an important role in controlling heading under long-day conditions .
In addition , QTLs near Hd2 , Hd16 , and Ghd7 , which are involved in inhibition of heading under long-day conditions , function in the same pathway that controls heading date .
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[ Sen. 5, subscore: 2.00 ]: Analysis of advanced backcross progenies revealed genetic interactions between Hd2 and Hd16 and between Hd2 and Ghd7 .
[ Sen. 2, subscore: 1.00 ]: To examine the inhibition of heading by Heading date 2 ( Hd2 ) , previously detected on the distal end of chromosome 7s long arm by quantitative trait locus ( QTL ) analysis , we developed backcross inbred lines ( BILs ) from Koshihikari , a leading Japanese cultivar , and Hayamasari , an extremely early heading cultivar .
[ Sen. 4, subscore: 1.00 ]: Combinations of several QTLs near Hd1 , Hd2 , Ghd7 , Hd5 , and Hd16 were detected under these four conditions .
[ Sen. 6, subscore: 1.00 ]: In the homozygous Koshihikari genetic background at Hd16 , inhibition of heading by the Koshihikari allele at Hd2 was smaller than that with the Hayamasari Hd16 allele .
[ Sen. 7, subscore: 1.00 ]: Similarly , in the homozygous Koshihikari genetic background at Ghd7 , the difference in heading date caused by different alleles at Hd2 was smaller than in plants homozygous for the Hayamasari Ghd7 allele .
[ Sen. 8, subscore: 1.00 ]: Based on these results , we conclude that Hd2 and its genetic interactions play an important role in controlling heading under long-day conditions .
[ Sen. 9, subscore: 1.00 ]: In addition , QTLs near Hd2 , Hd16 , and Ghd7 , which are involved in inhibition of heading under long-day conditions , function in the same pathway that controls heading date .
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Score: 5.00 |
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| Title: Flowering response of rice to photoperiod and temperature : a QTL analysis using a phenological model .
| | Author: Nakagawa H Yamagishi J Miyamoto N Motoyama M Yano M Nemoto K | | Journal: Theor . Appl . Genet . Citation: V : 110 ( 4 ) P : 778-86 Year: 2005 Type: ARTICLE | | Literature: oryza Field: abstract Doc ID: pub15723276 Accession (PMID): 15723276 | | Abstract: In this study we have attempted to quantify the thermal and photoperiodical responses of rice ( Oryza sativa L ) flowering time QTLs jointly by a date-of-planting field experiment of a mapping population , and a phenological model analysis that separately parameterizes the two responses , based on daily temperature , daily photoperiod and flowering date .
For this purpose , the three-stage Beta model , which parameterizes the sensitivity to temperature ( parameter alpha ) , the sensitivity to photoperiod ( parameter beta ) , and earliness under optimal conditions ( 10 h photoperiod at 30 degrees C ) ( parameter G ) , was applied to Nipponbare x Kasalath backcross inbred lines that were transplanted on five dates .
QTLs for the beta value were detected in the four known flowering time QTL ( Hd1 , Hd2 , Hd6 and Hd8 ) regions , while QTLs for the G value were detected only in the Hd1 and Hd2 regions .
This result was consistent with previous reports on near-isogenic lines ( NILs ) of Hd1 , Hd2 and Hd6 , where these loci were involved in photoperiod sensitivity , and where Hd1 and Hd2 conferred altered flowering under both 10 and 14 h photoperiods , while Hd6 action was only affected by the 14 h photoperiod .
Hd8 was shown to control photoperiod sensitivity for the first time .
Interestingly , Hd1 and Hd2 were associated with a QTL for the alpha value , which might support the previous hypothesis that the process of photoinduction depends on temperature .
These results demonstrate that our approach can effectively quantify environmental responses of flowering time QTLs without controlled environments or NILs . | Matching Sentences:
[ Sen. 3, subscore: 2.00 ]: QTLs for the beta value were detected in the four known flowering time QTL ( Hd1 , Hd2 , Hd6 and Hd8 ) regions , while QTLs for the G value were detected only in the Hd1 and Hd2 regions .
[ Sen. 4, subscore: 2.00 ]: This result was consistent with previous reports on near-isogenic lines ( NILs ) of Hd1 , Hd2 and Hd6 , where these loci were involved in photoperiod sensitivity , and where Hd1 and Hd2 conferred altered flowering under both 10 and 14 h photoperiods , while Hd6 action was only affected by the 14 h photoperiod .
[ Sen. 6, subscore: 1.00 ]: Interestingly , Hd1 and Hd2 were associated with a QTL for the alpha value , which might support the previous hypothesis that the process of photoinduction depends on temperature .
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Score: 5.00 |
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| Title: Epigenetic chromatin modifiers in barley : I Cloning , mapping and expression analysis of the plant specific HD2 family of histone deacetylases from barley , during seed development and after hormonal treatment .
| | Author: Demetriou K Kapazoglou A Tondelli A Francia E Stanca MA Bladenopoulos K Tsaftaris AS | | Journal: Physiol Plant Citation: V : P : Year: 2009 Type: Publisher | | Literature: oryza Field: abstract Doc ID: pub19470089 Accession (PMID): 19470089 | | Abstract: Epigenetic phenomena have been associated with modifications of chromatin structure .
These are achieved , in part , by histone post-translational modifications including acetylations and deacetylations , the later being catalyzed by histone deacetylaces ( HDACs ) .
Eukaryotic HDACs are grouped into three major families , RPD3/HDA1 , SIR2 and the plant-specific HD2 .
HDAC genes have been analyzed from model plants such as Arabidopsis , rice and maize and have been shown to be involved in various cellular processes including seed development , vegetative and reproductive growth and responses to abiotic and biotic stress , but reports on HDACs from other crops are limited .
In this work two full-length cDNAs ( HvHDAC2-1 and HvHDAC2-2 ) encoding two members of the plant-specific HD2 family , respectively , were isolated and characterized from barley ( Hordeum vulgare ) , an agronomically important cereal crop .
HvHDAC2-1 and HvHDAC2-2 were mapped on barley chromosomes 1H and 3H , respectively , which could prove useful in developing markers for marker-assisted selection in breeding programs .
Expression analysis of the barley HD2 genes demonstrated that they are expressed in all it issues and seed developmental stages examined .
Significant differences were observed among it issues and seed stages , and between cultivars with varying seed size , suggesting an association of these genes with seed development .
Furthermore , the HD2 genes from barley were found to respond to treatments with plant stress-related hormones such as jasmonic acid ( JA ) , abscisic acid ( ABA ) and salicylic acid ( SA ) implying an association of these genes with plant resistance to biotic and abiotic stress .
The expression pattern of HD2 genes suggests a possible role for these genes in the epigenetic regulation of seed development and stress response .
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[ Sen. 3, subscore: 1.00 ]: Eukaryotic HDACs are grouped into three major families , RPD3/HDA1 , SIR2 and the plant-specific HD2 .
[ Sen. 5, subscore: 1.00 ]: In this work two full-length cDNAs ( HvHDAC2-1 and HvHDAC2-2 ) encoding two members of the plant-specific HD2 family , respectively , were isolated and characterized from barley ( Hordeum vulgare ) , an agronomically important cereal crop .
[ Sen. 7, subscore: 1.00 ]: Expression analysis of the barley HD2 genes demonstrated that they are expressed in all it issues and seed developmental stages examined .
[ Sen. 9, subscore: 1.00 ]: Furthermore , the HD2 genes from barley were found to respond to treatments with plant stress-related hormones such as jasmonic acid ( JA ) , abscisic acid ( ABA ) and salicylic acid ( SA ) implying an association of these genes with plant resistance to biotic and abiotic stress .
[ Sen. 10, subscore: 1.00 ]: The expression pattern of HD2 genes suggests a possible role for these genes in the epigenetic regulation of seed development and stress response .
| | Supplemental links/files: reference in endnote online text related articles pubmed citation | |
Score: 2.00 |
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| Title: Identification of heading date quantitative trait locus Hd6 and characterization of its epistatic interactions with Hd2 in rice using advanced backcross progeny .
| | Author: Yamamoto T Lin H Sasaki T Yano M | | Journal: Genetics Citation: V : 154 ( 2 ) P : 885-91 Year: 2000 Type: ARTICLE | | Literature: oryza Field: abstract Doc ID: pub10655238 Accession (PMID): 10655238 | | Abstract: A backcrossed population ( BC ( 4 ) F ( 2 ) ) derived from a cross between a japonica rice variety , Nipponbare , as the recurrent parent and an indica rice variety , Kasalath , as the donor parent showed a long-range variation in days to heading .
Quantitative trait loci ( QTL ) analysis revealed that two QTL , one on chromosome 3 , designated Hd6 , and another on chromosome 2 , designated Hd7 , were involved in this variation ; and Hd6 was precisely mapped as a single Mendelian factor by using progeny testing ( BC ( 4 ) F ( 3 ) ) .
The nearly isogenic line with QTL ( QTL-NIL ) that carries the chromosomal segment from Kasalath for the Hd6 region in Nipponbares genetic background was developed by marker-assisted selection .
In a day-length treatment test , the QTL-NIL for Hd6 prominently increased days to heading under a 13 . 5-hr day length compared with the recurrent parent , Nipponbare , suggesting that Hd6 controls photoperiod sensitivity .
QTL analysis of the F ( 2 ) population derived from a cross between the QTL-NILs revealed existence of an epistatic interaction between Hd2 , which is one of the photoperiod sensitivity genes detected in a previous analysis , and Hd6 .
The day-length treatment tests of these QTL-NILs , including the line introgressing both Hd2 and Hd6 , also indicated an epistatic interaction for photoperiod sensitivity between them .
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[ Sen. 5, subscore: 1.00 ]: QTL analysis of the F ( 2 ) population derived from a cross between the QTL-NILs revealed existence of an epistatic interaction between Hd2 , which is one of the photoperiod sensitivity genes detected in a previous analysis , and Hd6 .
[ Sen. 6, subscore: 1.00 ]: The day-length treatment tests of these QTL-NILs , including the line introgressing both Hd2 and Hd6 , also indicated an epistatic interaction for photoperiod sensitivity between them .
| | Supplemental links/files: reference in endnote online text related articles pubmed citation | |
Score: 2.00 |
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| Title: Comparative analysis of HD2 type histone deacetylases in higher plants .
| | Author: Dangl M Brosch G Haas H Loidl P Lusser A | | Journal: Planta Citation: V : 213 ( 2 ) P : 280-5 Year: 2001 Type: ARTICLE | | Literature: oryza Field: abstract Doc ID: pub11469594 Accession (PMID): 11469594 | | Abstract: Zea mays ( L ) histone deacetylase HD2 was identified as a new type of histone deacetylase ( HDAC ) unrelated to the well-known Rpd3p and Hdalp families but with sequence homology to peptidyl-prolyl cis-trans isomerases ( PPIases ) .
Here we show that HD2 is a multigene family with highly related members in various plant species .
Gene analysis revealed a similar exon/intron structure in Arabidopsis thaliana ( L ) Heynh . and Z mays , and most of the sequences analyzed were demonstrated to possess an intron of the very rare AT-AC type . | Matching Sentences:
[ Sen. 1, subscore: 1.00 ]: Zea mays ( L ) histone deacetylase HD2 was identified as a new type of histone deacetylase ( HDAC ) unrelated to the well-known Rpd3p and Hdalp families but with sequence homology to peptidyl-prolyl cis-trans isomerases ( PPIases ) .
[ Sen. 2, subscore: 1.00 ]: Here we show that HD2 is a multigene family with highly related members in various plant species .
| | Supplemental links/files: reference in endnote online text related articles pubmed citation | |
