Score: 4.00 |
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| Title: Fine mapping SPP1 , a QTL controlling the number of spikelets per panicle , to a BAC clone in rice ( Oryza sativa ) .
| | Author: Liu T Mao D Zhang S Xu C Xing Y | | Journal: Theor Appl Genet Citation: V : 118 P : 1509-17 Year: 2009 Type: In-Data-Review | | Literature: oryza Field: abstract Doc ID: pub19266175 Accession (PMID): 19266175 | | Abstract: Near isogenic lines ( NILs ) can be used to efficiently handle a target quantitative trait locus ( QTL ) by blocking genetic background noise .
One QTL , SPP1 , which controls the number of spikelets per panicle ( SPP ) , was located on chromosome 1 , near Gn1a , a cloned gene for rice production in a recombinant inbred line population .
NILs of the SPP1 regions were quickly obtained by self-crossing recombinant inbred line 30 which is heterozygous around SPP1 .
Using a random NIL-F ( 2 ) population of 210 individuals , we mapped SPP1 to a 2 . 2-cM interval between RM1195 and RM490 , which explained 51 . 1% of SPP variation .
The difference in SPP between the two homozygotes was 44 .
F ( 2 ) -1456 , one NIL-F ( 2 ) plant , was heterozygous in the SPP1 region but was fixed in the region of Gn1a gene .
This plant F ( 3 ) family showed a very wide variation in SPP , which suggested that it was SPP1 but Gn1a affected the variation of SPP in this population .
In a word , SPP1 is a novel gene distinct from Gn1a .
Four newly developed InDel markers were used for high-resolution mapping of SPP1 with a large NIL-F ( 2 ) population .
Finally , it was narrowed down to a bacterial artificial chromosome clone spanning 107 kb ; 17 open reading frames have been identified in the region .
Of them , LOC_Os01g12160 , which encodes an IAA synthetase , is the most interesting candidate gene .
| Matching Sentences:
[ Sen. 2, subscore: 1.00 ]: One QTL , SPP1 , which controls the number of spikelets per panicle ( SPP ) , was located on chromosome 1 , near Gn1a , a cloned gene for rice production in a recombinant inbred line population .
[ Sen. 6, subscore: 1.00 ]: F ( 2 ) -1456 , one NIL-F ( 2 ) plant , was heterozygous in the SPP1 region but was fixed in the region of Gn1a gene .
[ Sen. 7, subscore: 1.00 ]: This plant F ( 3 ) family showed a very wide variation in SPP , which suggested that it was SPP1 but Gn1a affected the variation of SPP in this population .
[ Sen. 8, subscore: 1.00 ]: In a word , SPP1 is a novel gene distinct from Gn1a .
| | Supplemental links/files: reference in endnote online text related articles pubmed citation | |
Score: 1.00 |
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| Title: Cytokinin oxidase regulates rice grain production .
| | Author: Ashikari M Sakakibara H Lin S Yamamoto T Takashi T Nishimura A Angeles ER Qian Q Kitano H Matsuoka M | | Journal: Science Citation: V : 309 ( 5735 ) P : 741-5 Year: 2005 Type: ARTICLE | | Literature: oryza Field: abstract Doc ID: pub15976269 Accession (PMID): 15976269 | | Abstract: Most agriculturally important traits are regulated by genes known as quantitative trait loci ( QTLs ) derived from natural allelic variations .
We here show that a QTL that increases grain productivity in rice , Gn1a , is a gene for cytokinin oxidase/dehydrogenase ( OsCKX2 ) , an enzyme that degrades the phytohormone cytokinin .
Reduced expression of OsCKX2 causes cytokinin accumulation in inflorescence meristems and increases the number of reproductive organs , resulting in enhanced grain yield .
QTL pyramiding to combine loci for grain number and plant height in the same genetic background generated lines exhibiting both beneficial traits .
These results provide a strategy for tailormade crop improvement . | Matching Sentences:
[ Sen. 2, subscore: 1.00 ]: We here show that a QTL that increases grain productivity in rice , Gn1a , is a gene for cytokinin oxidase/dehydrogenase ( OsCKX2 ) , an enzyme that degrades the phytohormone cytokinin .
| | Supplemental links/files: reference in endnote online text related articles pubmed citation | |
Score: 1.00 |
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| Title: The contribution of intersubspecific hybridization to the breeding of super-high-yielding japonica rice in northeast China .
| | Author: Sun J Liu D Wang JY Ma DR Tang L Gao H Xu ZJ Chen WF | | Journal: Theor Appl Genet Citation: V : P : Year: 2012 Type: Publisher | | Literature: oryza Field: abstract Doc ID: pub22660631 Accession (PMID): 22660631 | | Abstract: Hybridization between indica and japonica rice combined with utilization of ideal plant type has led to the development of high-yielding japonica rice in northern China .
However , the contribution at the genomic level of intersubspecific hybridization to the increased yield of northern Chinese japonica rice is uncertain .
In this study , we analyzed the genomic pedigree of descendants of hybridization between indica and japonica rice grown in northeastern China between 1963 and 2008 .
Simple sequence repeat markers indicated that since 1990 the genetic diversity among northern japonica cultivars was enriched .
Genome-wide analysis with subspecies-specific indel and intron length polymorphism markers showed indica-allele frequencies were significantly increased in cultivars bred after 1990 , and were significantly positively correlated with spikelet number per panicle and significantly negatively correlated with panicle number per plant .
Among eight genes controlling agronomic traits , GN1a and GS3 were partially fixed in the genome of northern japonica cultivars .
In contrast , Waxy and qSH1 were eliminated , whereas DEP1 and qSW5 were retained .
Indica germplasm is an important contributor to the increased yield of northern japonica rice .
Breeding for high yield and grain quality in combination is a complicated process and difficult to achieve when relying on only one or several functional genes , thus the selection expertise of the breeder remains critical | Matching Sentences:
[ Sen. 6, subscore: 1.00 ]: Among eight genes controlling agronomic traits , GN1a and GS3 were partially fixed in the genome of northern japonica cultivars .
| | Supplemental links/files: reference in endnote online text related articles pubmed citation | |
