Score: 2.00 |
|---|
| 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: 2.00 ]: 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: SNP in starch biosynthesis genes associated with nutritional and functional properties of rice .
| | Author: Kharabian-Masouleh A Waters DL Reinke RF Ward R Henry RJ | | Journal: Sci Rep Citation: V : 2 P : 557 Year: 2012 Type: In-Data-Review | | Literature: oryza Field: abstract Doc ID: pub22870386 Accession (PMID): 22870386 | | Abstract: Starch is a major component of human diets .
The relative contribution of variation in the genes of starch biosynthesis to the nutritional and functional properties of the rice was evaluated in a rice breeding population .
Sequencing 18 genes involved in starch synthesis in a population of 233 rice breeding lines discovered 66 functional SNPs in exonic regions .
Five genes , AGPS2b , Isoamylase1 , SPHOL , SSIIb and SSIVb showed no polymorphism .
Association analysis found 31 of the SNP were associated with differences in pasting and cooking quality properties of the rice lines .
Two genes appear to be the major loci controlling traits under human selection in rice , GBSSI ( waxy gene ) and SSIIa .
GBSSI influenced amylose content and retrogradation .
Other genes contributing to retrogradation were GPT1 , SSI , BEI and SSIIIa .
SSIIa explained much of the variation in cooking characteristics .
Other genes had relatively small effects .
| Matching Sentences:
[ Sen. 4, subscore: 1.00 ]: Five genes , AGPS2b , Isoamylase1 , SPHOL , SSIIb and SSIVb showed no polymorphism .
| | Supplemental links/files: reference in endnote online text related articles pubmed citation | |
