IPOMEAMARONE ACCUMULATION AND LIPID METABOLISM IN SWEET POTATO INFECTED BY THE BLACK ROT FUNGUS I. IDENTIFICATION OF STEROL AND CHANGES IN LIPID METABOLISM DURING INFECTION PROCESS1

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Abstract
Changes in lipid contents during infection process in the non-infected tissue adjacent to the infected region of diseased sweet potato roots with black rot were examined in comparison with cut control tissue. Incorporation of 2 14C-acetate and 32P-phosphate into lipid fraction was also investigated. Although there was no significant change in lipid ester groups in both tissues, increase in phospholipids was found in diseased tissue. Sterol isolated from fresh material was identified with β-sitosterol. Chromatographic patterns of non-phospholipid fraction of diseased tissue suggested that some metabolic alteration of this fraction might occur in response to infection.