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Effect of increased temperature on seed germination and DNA methylation in Arabidopsis thaliana, Brassica rapa and Solanum lycopersicum

Temperatures vary geographically and are predicted to rise with global warming. As sessile organisms, plants are unmercifully exposed to such environmental conditions causing crop loss worldwide. For dormant seeds, temperature and light are two main cues required for germination (Donhoe et al. 2003). Therefore, appropriate germination timing and response to temperature cues are necessary for plant development. A rich repertoire of flexible epigenetic machineries that control gene expression enables plants a quick response to external signals and to readily adapt to environmental conditions (Centomani et al. 2015). Understanding the epigenetic basis of sensitivity to temperature is therefore required for understanding interactions between plants and environment. Considering the importance of seeds for agriculture, we aimed to evaluate the impact of different heat stress regimes during the process of germination, partially mimicking global warming conditions. We determined the maximum permissive germination temperature and global DNA methylation levels of three plant species: model plant Arabidopsis thaliana and two globally important crop species Brassica rapa and Solanum lycopersicum.

Heat stress ; germination ; Arabidopsis thaliana ; Brassica rapa ; Solanum lycopersicum ; DNA methylation

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