A detached leaf stays green for 6 days. A matching leaf, sprayed with a cytokinin, stays green for…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A detached leaf stays green for days. A matching leaf, sprayed with a cytokinin, stays green for days.
- How many extra days does the sprayed leaf stay green?
- How many times as long does it stay green?
- Which process of the leaf does the cytokinin delay?
Need a reminder? The key ideaShow
Gibberellins (GA3, from the fungus Gibberella) are terpenes that lengthen the stem, promote bolting, delay senescence and speed malting. Cytokinins are adenine derivatives (kinetin, zeatin) that promote cell division and lateral shoots, overcome apical dominance and delay senescence. A high auxin to cytokinin ratio gives roots and a low ratio gives shoots.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. (a) days.
Step 2. (b) times as long.
Step 3. (c) The cytokinin delays senescence. It moves nutrients into the leaf, so the leaf does not age.
Answer: days; times; senescence.
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