Significance of allelic diversity and 2n gametes for approaching maximum heterozygosity in 4 x ppotatoes View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1991-10

AUTHORS

Joanna E. Werner, Stanley J. Peloquin

ABSTRACT

High level of heterozygosity is directly related to heterosis for yield in polysomic polyploids. Modern breeding schemes in potato (2n=4×=48) involve utilization of wild or cultivated 2 x relatives that provide a source of allelic diversity, and 2n gametes that transfer diversity to the 4 x level. Different levels of allelic diversity and different modes of 2 n egg formation were considered theoretically to determine their significance for the recovery of heterotic 4 x progeny from 2××4× crosses. The support from the experimental data is provided. Decline in parental allelic diversity in 2××4× crosses or 4××4× crosses resulted in significant yield reduction. The average level of homozygosity and loss of intra-locus interactions are equally adequate to predict the trend in yield changes in 4 x potatoes derived from parents of variable allelic diversity utilizing different modes of 2 n egg formation. The differences between the modes of 2 n gamete formation increase when the genetic diversity decreases. The more genetically diverse parents the less pronounced differences between 2 n gametes. Breeding of 4 x cultivars for polygenic traits where nonadditive effects are important should be oriented towards maximizing heterozygosity in terms of allelic diversity. Utilization of 2 n gametes to generate 4 x progeny following 2×−× or 2×−2× crosses upgrades the level of heterozygosity depending on diversity present in parents. More... »

PAGES

21-29

References to SciGraph publications

Journal

TITLE

Euphytica

ISSUE

1

VOLUME

58

Author Affiliations

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/bf00035336

DOI

http://dx.doi.org/10.1007/bf00035336

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1023614022


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