Document Detail


Epistasis for three grain yield components in rice (Oryza sativa L.).
MedLine Citation:
PMID:  9071598     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The genetic basis for three grain yield components of rice, 1000 kernel weight (KW), grain number per panicle (GN), and grain weight per panicle (GWP), was investigated using restriction fragment length polymorphism markers and F4 progency testing from a cross between rice subspecies japonica (cultivar Lemont from USA) and indica (cv. Tequing from China). Following identification of 19 QTL affecting these traits, we investigated the role of epistasis in genetic control of these phenotypes. Among 63 markers distributed throughout the genome that appeared to be involved in 79 highly significant (P < 0.001) interactions, most (46 or 73%) did not appear to have "main" effects on the relevant traits, but influenced the trait(s) predominantly through interactions. These results indicate that epistasis is an important genetic basis for complex traits such as yield components, especially traits of low heritability such as GN and GWP. The identification of epistatic loci is an important step toward resolution of discrepancies between quantitative trait loci mapping and classical genetic dogma, contributes to better understanding of the persistence of quantitative genetic variation in populations, and impels reconsideration of optimal mapping methodology and marker-assisted breeding strategies for improvement of complex traits.
Authors:
Z Li; S R Pinson; W D Park; A H Paterson; J W Stansel
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Genetics     Volume:  145     ISSN:  0016-6731     ISO Abbreviation:  Genetics     Publication Date:  1997 Feb 
Date Detail:
Created Date:  1997-07-24     Completed Date:  1997-07-24     Revised Date:  2010-09-13    
Medline Journal Info:
Nlm Unique ID:  0374636     Medline TA:  Genetics     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  453-65     Citation Subset:  IM    
Affiliation:
Department of Soil and Crop Sciences, Texas A&M University, College Station 77843, USA. zli@tam2000.tamu.edu
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MeSH Terms
Descriptor/Qualifier:
Adaptation, Physiological
Cereals
Epistasis, Genetic*
Genetic Variation
Oryza sativa / genetics*
Comments/Corrections

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