Abstract
Key message
Meiosis and unreduced gametes.
Sexual flowering plants produce meiotically derived cells that give rise to the male and female haploid gametophytic phase. In the ovule, usually a single precursor (the megaspore mother cell) undergoes meiosis to form four haploid megaspores; however, numerous mutants result in the formation of unreduced gametes, sometimes showing female specificity, a phenomenon reminiscent of the initiation of gametophytic apomixis. Here, we review the developmental events that occur during female meiosis and megasporogenesis at the light of current possibilities to engineer unreduced gamete formation. We also provide an overview of the current understanding of mechanisms leading to parthenogenesis and discuss some of the conceptual implications for attempting the induction of clonal seed production in cultivated plants.
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References
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Acknowledgments
We thank Zac Cande and Inna Golubovskaya for their dedication and generosity on sharing their meiotic mutant collection of maize. Research in our laboratory is sponsored by Consejo Nacional de Ciencia y Tecnologia (CONACyT), Consejo de Ciencia y Tecnología del Estado de Guanajuato (CONCyTEG) and the DuPont Pioneer regional initiatives to benefit local subsistence farmers.
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Communicated by Silvia Coimbra and Lucia Colombo.
A contribution to the special issue ‘From Gametes to Seeds’.
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Ronceret, A., Vielle-Calzada, JP. Meiosis, unreduced gametes, and parthenogenesis: implications for engineering clonal seed formation in crops. Plant Reprod 28, 91–102 (2015). https://doi.org/10.1007/s00497-015-0262-6
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DOI: https://doi.org/10.1007/s00497-015-0262-6