Bilateral sexual polyploidization in potatoes View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1977-12

AUTHORS

A. O. Mendiburu, S. J. Peloquin

ABSTRACT

Bilateral sexual tetraploidization was achieved by intercrossing diploid Phureja × haploid Tuberosum hybrids. Both parents contribute gametes with the somatic number of chromosomes (diplogynoids and diplandroids). More than 100 tetraploid progeny appeared in nine 2x−2x families. The tetraploids are generally more vigorous and significantly outyield their diploid ‘full-sibs’. The superiority of the tetraploids is interpreted on the basis of the mode of diplandroid (2n pollen) formation by first meiotic division restitution (FDR). Heterozygosis, epistasis and genetic diversity, if present in the parental diploid genotype, are largely maintained in the 2n gametes formed by FDR. and syngamy brings about more opportunities for heterotic responses in conjunction with polyploidization. Differences in tuber yield among tetraploid clones within families were found to be statistically significant (P <0.05). Thus, unlike somatic chromosome doubling, which can merely increase chromosome numbers, or somatic hybridization, which could in addition bring about heterosis, sexual polyploidization is also associated with genetic variability. The degree of inbreeding and the genotypic structure in the population of newly arisen tetraploids is discussed. The relationship among asexual reproduction, preservation of favorable nonadditive genetic effects by FDR. restoration of sexuality, and polyploidization is explored. The possible evolutionary significance of these factors is emphasized. More... »

PAGES

573-583

Journal

TITLE

Euphytica

ISSUE

3

VOLUME

26

Author Affiliations

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/bf00021683

DOI

http://dx.doi.org/10.1007/bf00021683

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1021458871


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