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9 matches found in 4 documents. Search time: 0.093 seconds.
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Score: 8.00
Title: Wheat granule-bound starch synthase I and II are encoded by separate genes that are expressed in different it issues .
Author: Vrinten PL Nakamura T
Journal: Plant Physiol . Citation: V : 122 ( 1 ) P : 255-64 Year: 2000 Type: ARTICLE
Literature: oryza Field: abstract Doc ID: pub10631269 Accession (PMID): 10631269
Abstract: Studies of waxy mutations in wheat and other cereals have shown that null mutations in genes encoding granule-bound starch synthase I ( GBSSI ) result in amylose-free starch in endosperm and pollen grains , whereas starch in other it issues may contain amylose . We have isolated a cDNA from waxy wheat that encodes GBSSII , which is thought to be responsible for the elongation of amylose chains in non-storage it issues . The deduced amino acid sequences of wheat GBSSI and GBSSII were almost 66% identical , while those of wheat GBSSII and potato GBSSI were 72% identical GBSSII was expressed in leaf , culm , and pericarp it issue , but transcripts were not detected in endosperm it issue . In contrast , GBSSI expression was high in endosperm it issue . The expression of GBSSII mRNA in pericarp it issue was similar at the midpoints of the day and night periods . The GBSSII genes were mapped to chromosomes 2AL , 2B , and 2D , whereas GBSSI genes are located on group 7 chromosomes . Gel-blot analysis indicated that genes related to GBSSII also occur in barley , rice , and maize . The possible role of GBSSII in starch synthesis is discussed .
Matching Sentences:
[ Sen. 3, subscore: 3.00 ]: The deduced amino acid sequences of wheat GBSSI and GBSSII were almost 66% identical , while those of wheat GBSSII and potato GBSSI were 72% identical GBSSII was expressed in leaf , culm , and pericarp it issue , but transcripts were not detected in endosperm it issue .
[ Sen. 2, subscore: 1.00 ]: We have isolated a cDNA from waxy wheat that encodes GBSSII , which is thought to be responsible for the elongation of amylose chains in non-storage it issues .
[ Sen. 5, subscore: 1.00 ]: The expression of GBSSII mRNA in pericarp it issue was similar at the midpoints of the day and night periods .
[ Sen. 6, subscore: 1.00 ]: The GBSSII genes were mapped to chromosomes 2AL , 2B , and 2D , whereas GBSSI genes are located on group 7 chromosomes .
[ Sen. 7, subscore: 1.00 ]: Gel-blot analysis indicated that genes related to GBSSII also occur in barley , rice , and maize .
[ Sen. 8, subscore: 1.00 ]: The possible role of GBSSII in starch synthesis is discussed .
Supplemental links/files: reference in endnote online text related articles pubmed citation
Score: 1.00
Title: A comprehensive expression analysis of the starch synthase gene family in rice ( Oryza sativa L ) .
Author: Hirose T Terao T
Journal: Planta Citation: V : 220 ( 1 ) P : 9-16 Year: 2004 Type: ARTICLE
Literature: oryza Field: abstract Doc ID: pub15232694 Accession (PMID): 15232694
Abstract: To elucidate the roles of the isogenes encoding starch synthase ( EC 2 . 4 . 1 . 21 ) in rice ( Oryza sativa L ) , a comprehensive expression analysis of the gene family was conducted . Extensive searches for starch synthase genes were done in the databases of both the whole genome and full-length cDNAs of rice , and ten genes were revealed to comprise the starch synthase gene family . Multi-sequence alignment analysis of the starch synthase proteins from rice and other plant species suggested that they were grouped into five classes , soluble starch synthase I ( SSI ) , SSII , SSIII , SSIV and granule-bound starch synthase ( GBSS ) . In rice , there was one gene for SSI , three for SSII and two each for SSIII , IV and GBSS . The expression pattern of the ten genes in the developing caryopsis was examined by semi-quantitative RT-PCR analysis . Based on the temporal expression patterns , the ten genes could be divided into three groups : ( i ) early expressers ( SSII-2 , III-1 , GBSSII ) , which are expressed in the early stage of grain filling ; ( ii ) late expressers ( SSII-3 , III-2 , GBSSI ) , which are expressed in the mid to later stage of grain filling ; and ( iii ) steady expressers ( SSI , II-1 , IV-1 , IV-2 ) , which are expressed relatively constantly during grain filling . Within a caryopsis , the three gene groups spatially share their expression , ie "early expressers" in the pericarp , the "late expressers" in the endosperm" and the "steady expressers" in both it issues . In addition , this grouping was reflected in the expression pattern of various rice it issues : expression in non-endosperm , endosperm or all it issues examined . The implications in this spatio-temporal work sharing of starch synthesis isogenes are discussed .
Matching Sentences:
[ Sen. 6, subscore: 1.00 ]: Based on the temporal expression patterns , the ten genes could be divided into three groups : ( i ) early expressers ( SSII-2 , III-1 , GBSSII ) , which are expressed in the early stage of grain filling ; ( ii ) late expressers ( SSII-3 , III-2 , GBSSI ) , which are expressed in the mid to later stage of grain filling ; and ( iii ) steady expressers ( SSI , II-1 , IV-1 , IV-2 ) , which are expressed relatively constantly during grain filling .
Supplemental links/files: reference in endnote online text related articles pubmed citation
Score: 1.00
Title: Comparison of the starch synthesis genes between maize and rice : copies , chromosome location and expression divergence .
Author: Yan HB Pan XX Jiang HW Wu GJ
Journal: Theor Appl Genet Citation: V : 119 P : 815-25 Year: 2009 Type: MEDLINE
Literature: oryza Field: abstract Doc ID: pub19593540 Accession (PMID): 19593540
Abstract: Gene duplication and divergence are important evolutionary processes . It has been suggested that a whole genome duplication ( WGD ) event occurred in the Gramineae , predating its divergence , and a second WGD occurred in maize during its evolution . In this study we compared the fate of the genes involved in the core pathway of starch biosynthesis following the ancient and second WGDs in maize and rice . In total , thirty starch synthesis genes were detected in the maize genome , which covered all the starch synthesis gene families encoded by 27 genes in rice . All of these genes , except ZmGBSSIIb and ZmBEIII , are anchored within large-scale synteny blocks of rice and maize chromosomes . Previous findings and our results indicate that two of the current copies of many starch synthesis genes ( including AGPL , AGPS , GBSS , SSII , SSIII , and BEII ) probably arose from the ancient WGD in the Gramineae and are still present in the maize and rice genome . Furthermore , two copies of at least six genes ( AGPS1 , SSIIb , SSIIIb , GBSSII , BEI , and ISA3 ) appear to have been retained in the maize genome after its second WGD , although complete coding regions were only detected among the duplicate sets of AGPS1 , SSIIb , and SSIIIb . The expression patterns of the remaining duplicate sets of starch synthesis genes ( AGPL1/2 , AGPS1/2 , SSIIa/b , SSIIIa/b , GBSSI/II , and BEIIa/b ) differ in their expression and could be classified into two groups in maize . The first group is mainly expressed in the endosperm , whereas the second is expressed in other organs and the early endosperm development . The four duplicate sets of ZmGBSSII , ZmSSIIb , ZmSSIIIb and AGPS1 , which arose from the second WGD diverged in gene structure and/or expression patterns in maize . These results indicated that some duplicated starch synthesis genes were remained , whereas others diverged in gene structure and/or expression pattern in maize . For most of the duplicated genes , one of the copies has disappeared in the maize genome after the WGD and the subsequent "diploidization" .
Matching Sentences:
[ Sen. 7, subscore: 1.00 ]: Furthermore , two copies of at least six genes ( AGPS1 , SSIIb , SSIIIb , GBSSII , BEI , and ISA3 ) appear to have been retained in the maize genome after its second WGD , although complete coding regions were only detected among the duplicate sets of AGPS1 , SSIIb , and SSIIIb .
Supplemental links/files: reference in endnote online text related articles pubmed citation
Score: 1.00
Title: Starch branching enzymes belonging to distinct enzyme families are differentially expressed during pea embryo development .
Author: Burton RA Bewley JD Smith AM Bhattacharyya MK Tatge H Ring S Bull V Hamilton WD Martin C
Journal: Plant J Citation: V : 7 ( 1 ) P : 3-15 Year: 1995 Type: ARTICLE
Literature: oryza Field: abstract Doc ID: pub7894509 Accession (PMID): 7894509
Abstract: cDNA clones for two isoforms of starch branching enzyme ( SBEI and SBEII ) have been isolated from pea embryos and sequenced . The deduced amino acid sequences of pea SBEI and SBEII are closely related to starch branching enzymes of maize , rice , potato and cassava and a number of glycogen branching enzymes from yeast , mammals and several prokaryotic species . In comparison with SBEI , the deduced amino acid sequence of SBEII lacks a flexible domain at the N-terminus of the mature protein . This domain is also present in maize SBEII and rice SBEIII and resembles one previously reported for pea granule-bound starch synthase II ( GBSSII ) . However , in each case it is missing from the other isoform of SBE from the same species . On the basis of this structural feature ( which exists in some isoforms from both monocots and dicots ) and other differences in sequence , SBEs from plants may be divided into two distinct enzyme families . There is strong evidence from our own and other work that the amylopectin products of the enzymes from these two families are qualitatively different . Pea SBEI and SBEII are differentially expressed during embryo development . SBEI is relatively highly expressed in young embryos whilst maximum expression of SBEII occurs in older embryos . The differential expression of isoforms which have distinct catalytic properties means that the contribution of each SBE isoform to starch biosynthesis changes during embryo development . Qualitative measurement of amylopectin from developing and maturing embryos confirms that the nature of amylopectin changes during pea embryo development and that this correlates with the differential expression of SBE isoforms .
Matching Sentences:
[ Sen. 4, subscore: 1.00 ]: This domain is also present in maize SBEII and rice SBEIII and resembles one previously reported for pea granule-bound starch synthase II ( GBSSII ) .
Supplemental links/files: reference in endnote online text related articles pubmed citation
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