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Abstract Detail



Genetics Section

Noyes, Richard [1], Wagner, Jennifer [2].

Dihaploidy and the origin of diploid apomicts in Erigeron (Asteraceae).

Dihaploids in plants result when tetraploids produce reduced eggs that develop without fertilization into diploid progeny. This process is difficult to study because it usually occurs infrequently. In the course of studying the inheritance of apomixis in Erigeron, a tetraploid (2n=36) was obtained that in addition to producing maternal tetraploid progeny also produces dihaploids (2n=18) at a relatively high rate (16.5%). Analysis of reproductive development of 50 dihaploids reveals that the population segregates 1:1 for diplospory:meiosis. Thus half of the population, combining diplospory and parthenogenesis, are diploids that reproduce via apomixis. This is one of the first reports of diploid apomixis in the Asteraceae. The other half of the population includes plants that produce haploid egg cells for which we observe that approximately 50% of egg cells commence embryonic development via parthenogenesis. Analysis of rare seed produced by these plants indicates that some of the genotypes are capable of producing viable haploid (2n=9) progeny, that develop to flowering stage.

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1 - University of Central Arkansas, Department of Biology, Lewis Science Center 180, Conway, AR, 72035, USA
2 - University of Central Arkansas, Department of Biology, 180 Lewis Science Center, Conway, AR, 72034, USA

Keywords:
apomixis
dihaploidy
Asteraceae
parthenogenesis.

Presentation Type: Oral Paper:Papers for Sections
Session: 21
Location: Marlborough B/Riverside Hilton
Date: Tuesday, July 30th, 2013
Time: 9:15 AM
Number: 21003
Abstract ID:778
Candidate for Awards:None


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