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United States Department of Agriculture

Agricultural Research Service

Title: Inheritance and Linkage Relationships of Morphological and Isozyme Loci in As-Genome Diploid Oat (Avena SPP.)

Author
item Hoffman, David

Submitted to: Journal of Heredity
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: December 31, 1998
Publication Date: N/A

Interpretive Summary: The more common cultivated oat has three sets of chromosome pairs and is called "hexaploid". A less common cultivated oat has one set of chromosome pairs and is termed "diploid". The diploid oat is genetically less complex and can be used to help determine genetic relationships in the more complex hexaploid oat. Also, the diploid oat is a source of disease resistance genes. This study was conducted to determine the genetics of traditional marker genes and visual traits in the diploid oat. This information will be used to further genetic knowledge in the hexaploid oat and may be useful in the transfer of resistance genes from the diploid to the hexaploid oat.

Technical Abstract: Morphological and isozyme markers are useful supplements to molecular marker maps and can be used for comparative mapping studies. Isozymes, as neutral markers, have been used to study genic and evolutionary relationships among related species. In this study, the genetics of six morphological traits and isozyme variants of four enzyme systems were investigated with F2/F2:3 populations derived from three crosses of three As-genome diploid oat (Avena spp.) accessions. All traits and variants conformed to a model of monogenic inheritance except for lemma color. The four enzyme systems yielded six putative variant isozyme loci. Phenotypic data of the five monogenically inherited morphological traits and six isozyme loci were subjected to a pair-wise linkage analysis. Five linked pairs of loci were found. Multi-point linkage analysis identified a loose linkage group of two morphological and two isozyme loci. Included in the linkage group was a locus conferring alkaline beta-galactosidase (Bg11) and an esterase (Ests) locus. A similar linkage has been observed in hexaploid oat and barley. Additional studies are planned to verify and assign the small linkage group, and to assign the remaining unlinked markers. This new information will facilitate further mapping comparisons and evolution studies within Avena.

Last Modified: 12/17/2014
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