Commercial use of plant hormones

1. Selective weed killers 2. Rooting powders 3. Fruit ripening

How do selective weed killers work against weeds

High concentrations of auxin can distort plants with too much growth and allow pathogens to enter

How can we make sure crops such as wheat will not be affected by selective weed killer

The crops need to be able to tolerate a high concentration of auxin, they will not be sensitive to it

Smaller leaves absorb less auxin. Spraying auxin onto a field will kill the larger leaf weed species.

How do rooting powders work with growing new cuttings into plants

This is auxin at a low dose

Used prior to planting

Stimulates cell elongation

Which hormone is used in fruit ripening

Ethene

Why is it good to have controlled fruit ripening in industry

It is easier to transport the fruit avoiding damage

Then exposing the fruit to ethene will promote ripening to then be sold