How does sucrose affect the germination rate of seeds?

[woofdum]

How does sucrose affect the germination rate of broad bean seeds and how?
I've read about the osmosis, (although vague about it) but does that also affect it from seed (not seedling).
Will different concentrations affect the germination rate of a broad bean seed?

[pavi]

3% sugar is best for invitro growth.. raised sugars inhibit or slowdowns growth..