Factor(S) Remain in Ethyl Acetate Extract Synergistically act with Abscisic Acid in Inducing Wound Periderm Formation of Potato Tuber

Little is known about the endogenous factor(s) that involved wound periderm (WP) formation. The aim of this study was to determine the endogenous factor(s) that induce WP formation. Tissue discs were prepared from medullary tissues of potato tubers and the preparation regards to as wounding. The washed tissue discs were treated with different plant hormones, and abscisic acid  (ABA) showed a stimulatory effect in inducing WP formation. However, ABA cannot fully recover WP forming ability suggests some unknown compounds might also play a role in the formation of WP. Various organic solvent fractions obtained from cortical tissues of freshly harvested potato tuber were examined in the presence or absence of ABA. Ethyl acetate (EA) fraction in the presence of ABA fully restored WP forming ability of washed tissue disc. Thus the WP forming factor(s) might be present in the EA fraction and synergistically act with ABA.