Phaseic acid: Occurrence in cotton fruit; Acceleration of abscission.

Phaseic acid was tentatively identified in cotton fruit; this is the second report of its natural occurrence. It was found in cotton fruit of all ages, from very young to fully mature fruit. It accelerates abscission in the excised nodes of cotton seedlings, but has only about one-tenth of the abscission-promoting activity of abscisic acid.