Previous studies have shown that suberin is a cell wall-associated
biopolymer composed of two primary domains (1) a suberin poly
phenolic (SPP) forming the cell wall-localized suberin poly
(phenolic) domain (SPPD) and (2) a suberin poly aliphatic (SPA)
forming the suberin poly (aliphatic) domain (SPAD), localized
between the cell wall and plasma membrane