Submitted to: American Society of Plant Physiologists Meeting
Publication Type: Abstract Only
Publication Acceptance Date: 4/5/1999
Publication Date: N/A
Technical Abstract: Suberin is a protective biopolymer that is deposited on phellem cell walls of potato tubers during growth and wound-healing. Although suberin is know to be composed of complex polyphenolic and polyaliphatic domains, little is know about the biochemistry initiating and integrating the accumulation of these two domains. We have histochemically monitored the deposition of the two suberin domains during tuber wound-healing and we have adapted a simple method to chromatographically fingerprint suberin aliphatic accumulations in native periderm and developing wound periderm. These results, together with corresponding inhibitor studies and previous research, show that suberin phenolic deposition is histochemically detectable on wound- healing cell walls well in advance of suberin aliphatic deposition. However, unincorporated suberin aliphatic material is chromatographically detectable within the periderm before it begins to accumulate in suberizing cell walls. Several compounds were tested for inhibition of suberin polyphenolic and polyaliphatic deposition and the results indicated that suberin polyaliphatic deposition is coupled to the preceding polyphenolic deposition. These results are important in determining how suberization processes are initiated and integrated in potato tuber to prevent disease.