Normal segregation of allozyme markers in complex Rhododendron hybrids

Protocols were developed for visualizing enzyme polymorphisms among rhododendrons using starch gel electrophoresis. Genetic interpretation of nine enzyme systems comprising 15 polymorphic loci was facilitated by progeny testing of interspecific hybrid populations. In 53 of 58 segregations, phenotypi...

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Bibliographic Details
Published in:The Journal of heredity 1996-03, Vol.87 (2), p.131-135
Main Author: Krebs, S.L. (University of Wisconsin-Madison, Madison, WI.)
Format: Article
Language:English
Subjects:
ELECTROFORESIS
ELECTROPHORESE
ENZIMAS
ENZYME
Enzymes
Flowers & plants
Genetics
HEREDITE
HERENCIA GENETICA
HIBRIDACION INTERESPECIFICA
HIBRIDOS
HYBRIDATION INTERSPECIFIQUE
HYBRIDE
ISOENZIMAS
ISOENZYME
MARCADORES GENETICOS
MARQUEUR GENETIQUE
POLIMORFISMO ENZIMATICO
POLYMORPHISME ENZYMATIQUE
RHODODENDRON
SEGREGACION
SEGREGATION
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Summary:Protocols were developed for visualizing enzyme polymorphisms among rhododendrons using starch gel electrophoresis. Genetic interpretation of nine enzyme systems comprising 15 polymorphic loci was facilitated by progeny testing of interspecific hybrid populations. In 53 of 58 segregations, phenotypic ratios at these loci fit Mendelian models for single gene inheritance at the diploid level. Disomic inheritance was consistent across a diverse array of genetic backgrounds in complex hybrids averaging six species of Rhododendron per pedigree. The low frequency of segregation distortion in these highly interspecific populations was attributed to two possible mechanisms: (1) lack of significant chromosomal differentiation among the Rhododendron species involved and (2) selection for chromosomal and genetic stability over many generations of rhododendron breeding
ISSN:0022-1503
1465-7333
1471-8505
DOI:10.1093/oxfordjournals.jhered.a022968