Urszula Piskurewicz

TL;DR: Data support the notion that ABI5 acts as the final common repressor of germination in response to changes in ABA and GA levels, and could be recapitulated by the addition of a SnRK2 protein kinase to the A BI5 overexpression line.

TL;DR: The seed coat is presented as an organ actively controlling germination upon seed imbibition and provide a framework to investigate how environmental factors break seed dormancy.

TL;DR: It is shown that repression of germination by FR light involves stabilized DELLA factors GAI, RGA and RGL2 that stimulate endogenous ABA synthesis that blocks germination through the transcription factor ABI3.

TL;DR: Using a seed coat bedding assay, it is shown that canopy light specifically inactivates phyB activity in the endosperm to override phyA-dependent signaling in the embryo, leading to weaker ABA-dependent responses eventually enable phy A-dependent germination, a distinct type of germination driven solely by embryonic growth.

TL;DR: In mature seeds a thick cuticular film is identified covering the entire outer surface of the endosperm, which is defective in cutin-deficient bodyguard1 seeds, which correlates with alterations in endospermic permeability.