Genetic diversity and reproductive biology in ecotypes of the facultative apomict Hypericum perforatum L

Heredity
G. BarcacciaM Lucchin

Abstract

Apomixis is a mode of asexual reproduction through seed. Progeny produced by apomixis are clonal replicas of a mother plant. The essential feature of apomixis is that embryo sacs and embryos are produced in ovules without meiotic reduction or egg cell fertilisation. Thus, apomixis fixes successful gene combinations and propagates high fitness genotypes across generations. A more profound knowledge of the mechanisms that regulate reproductive events in plants would contribute fundamentally to understanding the evolution and genetic control of apomixis. Molecular markers were used to determine levels of genetic variation within and relationship among ecotypes of the facultative apomict Hypericum perforatum L. (2n = 4x = 32). All ecotypes were polyclonal, being not dominated by a single genotype, and characterised by different levels of differentiation among multilocus genotypes. Flow cytometric analysis of seeds indicated that all ecotypes were facultatively apomictic, with varying degrees of apomixis and sexuality. Seeds set by haploid parthenogenesis and/or by fertilisation of aposporic egg cells were detected in most populations. The occurrence of both dihaploids and hexaploids indicates that apospory and parthenogenesis may b...Continue Reading

References

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Citations

Jul 6, 2007·PloS One·Johannes J Le RouxCarol T Tran
Feb 19, 2010·Sexual Plant Reproduction·Elvira Hörandl
Jul 16, 2013·Plant Reproduction·Gianni Barcaccia, Emidio Albertini
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Oct 22, 2009·Physiologia Plantarum·Alexandre Oliveira FerreiraBirgit Arnholdt-Schmitt
Mar 6, 2010·The Plant Journal : for Cell and Molecular Biology·Anna SchallauHelmut Bäumlein
Oct 4, 2016·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·Ross BicknellAnna Koltunow
Mar 12, 2019·Journal of Experimental Botany·Emidio AlbertiniFulvio Pupilli
Jul 5, 2011·Annals of Botany·Elvira HörandlUrsula Ladinig
Sep 10, 2020·Plants·Caroline HowardAdrian Slater
May 24, 2016·The New Phytologist·Mario Vallejo-Marín, Simon J Hiscock
Mar 25, 2019·Frontiers in Plant Science·Pankaj KaushalDevendra R Malaviya
Apr 10, 2019·Planta·Xitong FeiAnzhi Wei
Mar 7, 2019·Frontiers in Plant Science·Kitty VijverbergM Eric Schranz
Sep 30, 2021·Cytometry. Part a : the Journal of the International Society for Analytical Cytology·Elwira SliwinskaDavid W Galbraith

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