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| Title: Mapping quantitative trait loci for yield components and morphological traits in an advanced backcross population between Oryza grandiglumis and the O sativa japonica cultivar Hwaseongbyeo .
| | Author: Yoon DB Kang KH Kim HJ Ju HG Kwon SJ Suh JP Jeong OY Ahn SN .
| | Journal: Theor . Appl . Genet . Citation: V : 112 ( 6 ) P : 1052-62 Year: 2006 Type: ARTICLE | | Literature: oryza Field: abstract Doc ID: pub16432737 Accession (PMID): 16432737 | | Abstract: Introgression has been achieved from wild species Oryza grandiglumis ( 2n = 48 , CCDD , Acc .
No 101154 ) into O sativa subsp . japonica cv .
Hwaseongbyeo as a recurrent parent .
An advanced introgression ( backcross ) line , HG101 , produced from a single plant from BC5F3 families resembled Hwaseongbyeo , but it showed differences from Hwaseongbyeo in several traits , including days to heading and culm length .
To detect the introgressions , 450 microsatellite markers of known chromosomal position were used for the parental survey .
Of the 450 markers , 51 ( 11 . 3% ) detected O grandiglumis segments in HG101 .
To characterize the effects of alien genes introgressed into HG101 , an F ( 2 : 3 ) population ( 150 families ) from the cross Hwaseongbyeo/HG101 was developed and evaluated for 13 agronomic traits .
Several lines outperformed Hwaseongbyeo in several traits , including days to heading .
Genotypes were determined for 150 F2 plants using simple sequence repeat markers .
Qualitative trait locus ( QTL ) analysis was carried out to determine the relationship between marker genotype and the traits evaluated .
A total of 39 QTL and 1 gene conferring resistance to blast isolate were identified using single-point analysis .
Phenotypic variation associated with each QTL ranged from 4 . 2 to 30 . 5% .
For 18 ( 46 . 2% ) of the QTL identified in this study , the O grandiglumis-derived alleles contributed a desirable agronomic effect despite the overall undesirable characteristics of the wild phenotype .
Favorable wild alleles were detected for days to heading , spikelets per panicle , and grain shape traits .
Grain shape QTL for grain weight , thickness , and width identified in the F ( 2 : 3 ) lines were further confirmed based on the F4 progeny test The confirmed locus , tgw2 for grain weight is of particular interest because of its independence from undesirable height and maturity .
Several QTL controlling amylose content and grain traits have not been detected in the previous QTL studies between Oryza cultivars , indicating potentially novel alleles from O grandiglumis .
The QTL detected in this study could be a rich source of natural genetic variation underlying the evolution and breeding of rice . | Matching Sentences:
[ Sen. 15, subscore: 1.00 ]: Grain shape QTL for grain weight , thickness , and width identified in the F ( 2 : 3 ) lines were further confirmed based on the F4 progeny test The confirmed locus , tgw2 for grain weight is of particular interest because of its independence from undesirable height and maturity .
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