Document Detail

Resistance to barley scald (Rhynchosporium secalis) in the Ethiopian donor lines 'Steudelli' and 'Jet', analyzed by partial least squares regression and interval mapping.
MedLine Citation:
PMID:  15660977     Owner:  NLM     Status:  MEDLINE    
The resistance of barley (Hordeum vulgare L.) to Rhynchosporium secalis (scald) has been investigated in two crosses between the susceptible cv. 'Ingrid' and two resistant Ethiopian landraces, 'Steudelli' and 'Jet'. Doubled haploids were inoculated in replicated tests using two isolates of R. secalis, '4004' and 'WRS1872'. Expression of resistance differed widely between replicated tests. AFLP, SSR and RFLP markers were used to develop chromosome maps. Results have been analysed using partial least squares regression (PLSR) and interval mapping. In PLSR the major covariance structures or 'latent variables' between X (markers) and Y (isolates, tests) are modelled as principal components and their optimal number determined by cross-validation. In 'Steudelli' two QTL were detected, one on each of chromosomes 3H and 7H, in 4 out of 5 tests, while in 'Jet' only one (different) allele at the 3H locus was found. The validated R(2) varied between 11.0% and 64.9% in the replicated tests with '4004'.With isolate 'WRS1872' the 7H locus and another 3H locus were detected. By interval mapping the QTL detected were less stable and generally gave lower R(2) values than PLSR. PLSR does not depend on maps, but interval mapping based on values predicted by PLSR had R(2) around 90%. It is suggested that PLSR may be a useful tool in QTL analysis.
A Bjørnstad; S Grønnerød; J Mac Key; A Tekauz; J Crossa; H Martens
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Hereditas     Volume:  141     ISSN:  0018-0661     ISO Abbreviation:  Hereditas     Publication Date:  2004  
Date Detail:
Created Date:  2005-01-21     Completed Date:  2005-03-04     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0374654     Medline TA:  Hereditas     Country:  Sweden    
Other Details:
Languages:  eng     Pagination:  166-79     Citation Subset:  IM    
Agricultural University of Norway, Department of Plant and Environmental Sciences, NO-1432 As, Norway.
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MeSH Terms
Chromosome Mapping
Data Interpretation, Statistical
Fungi / physiology*
Hordeum / microbiology*,  physiology*
Immunity, Innate / physiology*
Least-Squares Analysis
Quantitative Trait Loci
Regression Analysis

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