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Hybrid performance and heterosis in spring bread wheat, and their relations to SSR-based genetic distances and coefficients of parentage

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Relation http://oar.icrisat.org/5721/
http://dx.doi.org/10.1007/s10681-005-4053-2
 
Title Hybrid performance and heterosis in spring bread wheat, and their relations to SSR-based genetic distances and coefficients of parentage
 
Creator Dreisigacker, S
et al, .
 
Subject Genetics and Genomics
Wheat
 
Description Development of hybrids is considered to be a promising avenue to enhance the yield potential of crops. We
investigated (i) the amount of heterosis observed in hybrid progeny, (ii) relative importance of general (GCA)
versus specific (SCA) combining ability, and (iii) the relationship between heterosis and genetic distance measures
in four agronomic traits of spring bread wheat. Eight male and 14 female lines, as well as 112 hybrids produced
in a factorial design were grown in replicated trials at two environments in Mexico. Principal coordinate analysis
based on Rogers’ distance (RD) estimates calculated from 113 SSRs revealed three different groups of parents.
Mid-parent heterosis (MPH) for grain yield averaged 0.02 t ha−1 (0.5%) and varied from−15.33% to 14.13%. MPH
and hybrid performance (F1P) were higher for intra-group hybrids than for inter-group hybrids, with low values
observed in inter-group crosses involving two non-adapted Chinese parents. Combined analyses of variance revealed
significant differences among parents and among hybrids. Estimates of GCA variances were more important than
SCA variances for all traits. Tight correlations of GCA with line per se performance, and mid-parent value with
F1P were observed for all traits. In contrast, correlations of MPH with RD and coefficient of parentage were not
significant. It was concluded that the level of heterosis in spring wheat was too low to warrant a commercial
exploitation in hybrids. SSRs proved to be a powerful tool for the identification of divergent groups in advanced
wheat breeding materials.
 
Publisher Springer
 
Date 2005
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
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Identifier http://oar.icrisat.org/5721/1/Euphytica_144_51%E2%80%9359_2005.pdf
Dreisigacker, S and et al, . (2005) Hybrid performance and heterosis in spring bread wheat, and their relations to SSR-based genetic distances and coefficients of parentage. Euphytica, 144 (1-2). pp. 51-59. ISSN 1573-5060