Plant seeds will not germinate when in a dormant state. What then are the factors controlling dormancy? A recent study has uncovered two basic-helix-loop-helix proteins which repress germination and are critical for maintaining dormancy. The combined action of light and cold synergistically alleviates activity of these repressors thus stimulating germination.
Tsiantis, M. (2006, January 10). Plant development: Multiple strategies for breaking seed dormancy. Current Biology. https://doi.org/10.1016/j.cub.2005.12.010