Document Detail


The genetic basis of stay-green in rice analyzed in a population of doubled haploid lines derived from an indica by japonica cross.
MedLine Citation:
PMID:  14564397     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Delayed leaf-senescence, or stay-green, has been regarded as a desired characteristic for the production of a number of crops including rice. In this study, we analyzed the genetic basis of stay-green using a population of 190 doubled haploid lines from the cross between an indica parent Zhenshan 97 and a stay-green japonica parent Wuyujing 2. The population was tested in replicated field trials in 2 consecutive years, and six traits were defined to evaluate the stay-green characteristics. A genetic linkage map with 179 SSR (simple sequence repeat) marker loci was constructed. The software QTLMapper, based on a mixed linear model approach, was applied to detect QTLs, epistatic effects and their environmental interactions for these traits. A total of 46 main-effect QTLs was detected for the six traits that can be localized to 25 chromosomal regions. The individual effects of all the QTLs were small. Fifty digenic interactions were resolved that involved 66 loci distributed on all 12 chromosomes. Environmental interactions were detected for 18 of the main-effect QTLs and 14 of the epistatic interactions. Collectively, the epistatic effects and QTL by year interactions accounted for large proportions of the phenotypic variations. The results also showed that most of the stay-green traits were negatively correlated with yield and its component traits. The implications of the results in crop improvement were discussed.
Authors:
G H Jiang; Y Q He; C G Xu; X H Li; Q Zhang
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't     Date:  2003-10-16
Journal Detail:
Title:  TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik     Volume:  108     ISSN:  0040-5752     ISO Abbreviation:  Theor. Appl. Genet.     Publication Date:  2004 Feb 
Date Detail:
Created Date:  2004-03-01     Completed Date:  2004-04-30     Revised Date:  2008-02-15    
Medline Journal Info:
Nlm Unique ID:  0145600     Medline TA:  Theor Appl Genet     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  688-98     Citation Subset:  IM    
Affiliation:
National Key Laboratory of Crop Genetic Improvement and National Center of Crop Molecular Breeding, Huazhong Agricultural University, 430070 Wuhan, China.
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MeSH Terms
Descriptor/Qualifier:
Chromosome Mapping*
Crosses, Genetic
Haploidy
Minisatellite Repeats
Oryza sativa / genetics*,  physiology
Phenotype*
Plant Leaves / physiology*
Quantitative Trait Loci / genetics*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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