11. Under normal
conditions, shoot tips
bend towards the light.
Without light on
the tip, no bending
When not at tip,
collar doesn’t
prevent bending
Conclusion: Light is sensed at the tip, but response not at
tip.New hypothesis: A substance or chemical is transported.
Auxin later isolated from shoot tips and established
to be involved in cell elongation
12.
13.
14. The cytokinin zeatin, the
name is derived from Zea,
in which it was first discovered
in immature kernels.
15.
16. Hormones can work with
each other to regulate various
aspects of plant biology.
Here, auxin and cytokinin work
together in regulating lateral
bud formation… the sprouting
of lateral buds depends on the
ratio of cytokinin to auxin…
