5/8 Plant Hormones

1. Auxins
Produced in the stamp tip that promotes cell elongation. Auxin moves to the darker side of the plant, causing the cells there to grow larger than the cells on the lighter side. This makes the plant curve towards the light, a plant movement called phototropism.

2. Abscisic Acid
Plays a role in how plants respond to weather stresses, like cold and drought. It slows seed germination. When this acid lowers in the plant, the hormone can no longer prevent germination, and the seeds sprout. But sometimes the plant would be better off if they were delayed. It depends on how the plant would be effected by its outside environment.

3. Ethylene
Stimulates root growth, flower opening, fruit ripening
Most frequently used to ripen fruit that is harvested green and shipped to the consumer. Ripening fruit produces ethylene, and one ripe fruit can trigger the ripening of a whole basket of fruit.