Relationship between single-cross performance and molecular marker heterozygosity (original) (raw)
Summary
In studies involving isozymes or restriction fragment length polymorphisms (RFLPs), correlations of parental molecular marker diversity with grain yield of maize (Zea mays L.) single-crosses have been too low to be of any predictive value. The relationship of molecular marker heterozygosity (Dij) with hybrid performance (μ ij) and combining ability was examined. For a simple genetic model involving uncorrelated parental allele frequencies and complete coverage of quantitative trait loci (QTL) by molecular markers, the correlations between μ ij and Dij were ≤0.25. μ ij and Dij were partitioned into general and specific effects. The expected correlation between specific combining ability and specific molecular marker heterozygosity is high. Expected correlations between general combining ability and general molecular marker heterozygosity are either positive or negative, depending on allele frequencies in the tester lines. Computer simulation was used to investigate a more complex but more realistic genetic model involving incomplete coverage of QTL by molecular markers. All of the following conditions are necessary for effective prediction of hybrid performance based on molecular marker heterozygosity: (1) dominance effects are strong; (2) allele frequencies at individual loci in the parental inbreds are negatively correlated; (3) trait heritability is high; (4) average parental allele frequencies vary only within a narrow range; (5) at least 30–50% of the QTL are linked to molecular markers; and (6) not more than 20–30% of the molecular markers are randomly dispersed or unlinked to QTL.
Access this article
Subscribe and save
- Starting from 10 chapters or articles per month
- Access and download chapters and articles from more than 300k books and 2,500 journals
- Cancel anytime View plans
Buy Now
Price excludes VAT (USA)
Tax calculation will be finalised during checkout.
Instant access to the full article PDF.
Similar content being viewed by others
References
- Dudley JW, Saghai-Maroof MA, Rufener GK (1991) Molecular markers and grouping of parents in maize breeding programs. Crop Sci 31:718–723
Google Scholar - Frei OM, Stuber CW, Goodman MM (1986) Uses of allozymes as genetic markers for predicting performance in maize single cross hybrids. Crop Sci 26:37–42
Google Scholar - Godshalk EB, Lee M, Lamkey KR (1990) Relationship of restriction fragment length polymorphisms to single-cross hybrid performance of maize. Theor Appl Genet 80:273–280
Google Scholar - Gonella JA, Peterson PA (1978) Isozyme relatedness of inbred lines of maize and performance of their hybrids. Maydica 23:55–61
Google Scholar - Griffing B (1956) Concept of general and specific combining ability in relation to diallel crossing systems. Aust J Biol Sci 9:463–493
Google Scholar - Hallauer AR, Miranda JB Fo (1981) Quantitative genetics in maize breeding. Iowa State University Press, Ames, Iowa
Google Scholar - Heidrich-Sobrino E, Cordiero AR (1975) Codominant isozymic alleles as markers of genetic diversity correlated with heterosis in maize (Zea mays L.). Theor Appl Genet 46:197–199
Google Scholar - Hunter RB, Kannenberg LW (1971) Isozyme characterization of corn (Zea mays L.) inbreds and its relation to single cross hybrid performance. Can J Genet Cytol 13:649–655
Google Scholar - Lamkey KR, Hallauer AR, Kahler AL (1987) Allelic differences at enzyme loci and hybrid performance in maize. J Hered 78:231–234
Google Scholar - Lee M, Godshalk EB, Lamkey KR, Woodman WW (1989) Association of restriction fragment length polymorphisms among maize inbreds with agronomic performance of their crosses. Crop Sci 29:1067–1071
Google Scholar - Melchinger AE, Lee M, Lamkey KR, Woodman WL (1990) Genetic diversity for restriction fragment length polymorphisms: Relation to estimated genetic effects in maize inbreds. Crop Sci 30:1033–1040
Google Scholar - Price SC, Kahler AL, Hallauer AR, Charmley P, Giegel DA (1986) Relationships between performance and multilocus heterozygosity at enzyme loci in single-cross hybrids of maize. J Hered 77:341–344
Google Scholar - Smith OS (1986) Covariance between line per se and testcross performance. Crop Sci 26:540–543
Google Scholar
Author information
Authors and Affiliations
- Limagrain Genetics, 737 County Rd.,1200N, 61821, Champaign, IL, USA
R. Bernardo
Additional information
Communicated by A. R. Hallauer
A contribution from Limagrain Genetics, a Groupe Limagrain company
Rights and permissions
About this article
Cite this article
Bernardo, R. Relationship between single-cross performance and molecular marker heterozygosity.Theoret. Appl. Genetics 83, 628–634 (1992). https://doi.org/10.1007/BF00226908
- Received: 01 June 1991
- Accepted: 26 July 1991
- Issue date: March 1992
- DOI: https://doi.org/10.1007/BF00226908