Physiological and molecular mechanisms underlying the integration of light and temperature cues in Arabidopsis thaliana seeds
- Arana, Maria Veronica
- Tognacca, Rocío Soledad
- Estravis Barcala, Maximiliano
- Sanchez, Rodolfo Augusto
- Botto, Javier Francisco
DOIAbstract
The relief of dormancy and the promotion of seed germination are of extreme importance for a successful seedling establishment. Although alternating temperatures and light are signals promoting the relief of seed dormancy, the underlying mechanisms of their interaction in seeds are scarcely known. By exposing imbibed Arabidopsis thaliana dormant seeds to two-day temperature cycles previous of a red light pulse, we demonstrate that the germination mediated by phytochrome B requires the presence of functional PSEUDO-RESPONSE REGULATOR 7 (PRR7) and TIMING OF CAB EXPRESSION 1 (TOC1) alleles. In addition, daily cycles of alternating temperatures in darkness reduce the protein levels of DELAY OF GERMINATION 1 (DOG1), allowing the expression of TO...
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