High temperatures alter cross-over distribution and induce male meiotic restitution in Arabidopsis thaliana

Plant fertility is highly sensitive to elevated temperature. Here, we report that hot spells induce the formation of dyads and triads by disrupting the biogenesis or stability of the radial microtubule arrays (RMAs) at telophase II. Heat-induced meiotic restitution in Arabidopsis is predominantly SD...

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Bibliographic Details
Published inCommunications biology Vol. 3; no. 1; p. 187
Main Authors De Storme, Nico, Geelen, Danny
Format Journal Article
LanguageEnglish
Published London Nature Publishing Group UK 23.04.2020
Nature Publishing Group
Subjects
13/51
14/63
631/449/2661
631/449/2679
631/449/448
Arabidopsis
Biology
Biomedical and Life Sciences
Cell walls
Chromatids
Chromosomes
Fertility
Genomes
Heat
High temperature
Homologous recombination
Karyotypes
Life Sciences
Meiosis
Pachytene
Restitution
Sister chromatids
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Summary:Plant fertility is highly sensitive to elevated temperature. Here, we report that hot spells induce the formation of dyads and triads by disrupting the biogenesis or stability of the radial microtubule arrays (RMAs) at telophase II. Heat-induced meiotic restitution in Arabidopsis is predominantly SDR-type (Second Division Restitution) indicating specific interference with RMAs formed between separated sister chromatids. In addition, elevated temperatures caused distinct deviations in cross-over formation in male meiosis. Synapsis at pachytene was impaired and the obligate cross-over per chromosome was discarded, resulting in partial univalency in meiosis I (MI). At diakinesis, interconnections between non-homologous chromosomes tied separate bivalents together, suggesting heat induces ectopic events of non-homologous recombination. Summarized, heat interferes with male meiotic cross-over designation and cell wall formation, providing a mechanistic basis for plant karyotype change and genome evolution under high temperature conditions. de Storme and Geelen show that heat stress has pleiotropic effects on male meiosis in Arabidopsis , causing deviations in cross-over formations, reproduction, and fertility. They show that heat also affects cell wall formation, providing mechanistic insights into karyotype change under high temperatures.
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ISSN:2399-3642
2399-3642
DOI:10.1038/s42003-020-0897-1