This compound negatively 
This compound negatively regulates the salicylic acid-dependent defense pathway. The activity of this compound is regulated by ABRE transcription factors, which in turn are regulated by ABFs. The 40-carbon carotenoid violaxanthin is photolytically cleaved to form the main precursor of this compound, the 15-carbon xanthoxin. In addition to ethylene, this isoprenoid hormone promotes strawberry ripening. During water stress, this hormone closes stomata, and since its effect is the opposite of gibberellins, the balance between the two determines seed germination. For 10 points, identify this inhibitory plant hormone named for its role in leaf abscission.
This compound negatively regulates the salicylic acid-dependent defense pathway.
abscisic acid [or ABA, or abscisin II, or dormin]