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The relationship of heterosis and genetic divergence in maize

By: Moll, R.H.
Contributor(s): Lonnquist, J.H | Velez Fortuno, J | Johnson, E.C.
Material type: materialTypeLabelArticlePublisher: Baltimore, U.S. : Genetics Society of America, 1965Description: 6 pages.Subject(s): Heterosis AGROVOC | Genetic divergence | MaizeOnline resources: Access only for CIMMYT Staff In: Genetics v. 52, no. 1, p. 139-144611207, 612120Collection: CIMMYT Staff Publications Collection
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Item type Current location Collection Call number Copy number Status Date due Barcode Item holds
Article CIMMYT Knowledge Center: John Woolston Library

Lic. Jose Juan Caballero Flores

 

CIMMYT Staff Publications Collection CIS-104 (Browse shelf) 1 Available 611207
Article CIMMYT Knowledge Center: John Woolston Library

Lic. Jose Juan Caballero Flores

 

CIMMYT Staff Publications Collection CIS-104 (Browse shelf) 2 Available 612120
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Peer review

Tables, literature cited p. 144

HETEROSIS in maize appears to increase with increased genetic divergence of the parent populations over a rather wide range of diversity (MOLL, SALHUANA and ROBINSON19 62). It does not necessarily follow, however, that this relationship will hold throughout the entire ran.ge of diversity in the species. It is widely accepted that cumulative differences between isolated populations may eventually become great enough to cause genic unbalance in population hybrids, which may be manifest by poor F, viability. This is considered to be one of the possible steps toward speciation; and inferiority of interspecific hybrids is not uncommon. In the case of an organism which shows heterosis in crosses between divergent populations, it seems logical to expect that in crosses of extremely divergent populations, the expression of heterosis may be limited by unharmonious gene combinations in the F, hybrid. At higher levels of genetic divergence, then, an increase in divergence might be associated with a decrease in heterotic expression. The issue in this report is whether or not heterosis in maize continues to increase at higher levels of diversity.

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MIC 9895-R|3

CIMMYT Staff Publications Collection

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Si tiene cualquier pregunta, contáctenos a CIMMYT-Knowledge-Center@cgiar.org