VIEW ARTICLE

Physiology and Biochemistry

Accumulation of Furanoterpenoids in Sweet Potato Tissue Following Inoculation with Different Pathogens. C. A. Clark, Assistant professor, Department of Plant Pathology and Crop Physiology, Louisiana Agricultural Experiment Station, Louisiana State University, Baton Rouge 70803; Amanda Lawrence(2), and F. A. Martin(3). (2)(3)Research associate, and professor, Department of Plant Pathology and Crop Physiology, Louisiana Agricultural Experiment Station, Louisiana State University, Baton Rouge 70803. Phytopathology 71:708-711. Accepted for publication 16 December 1980. Copyright The American Phytopathological Society. DOI: 10.1094/Phyto-71-708.

Accumulation of 4-ipomeanol and 1,4-ipomeadiol in sweet potato storage roots was positively correlated with accumulation of ipomeamarone and total furanoterpenoids. Streptomyces ipomoea, Monilochaetes infuscans, and internal cork virus did not induce accumulation of detectable levels of ipomeamarone, 4-ipomeanol, or 1,4-ipomeadiol. Rhizopus stolonifer and Erwinia carotovora induced accumulation of relatively low concentrations of ipomeamarone (58–2,675 μg/g), 4-ipomeanol (from not detectable [ND] to 112 μg/g), and 1,4-ipomeadiol (ND–16 μg/g). Plenodomus destruens, Diaporthe batatatis, Diplodia tubericola, Fusarium solani, and Ceratocystis fimbriata induced accumulation of relatively high concentrations of ipomeamarone (63–16, 523 μg/g), 4-ipomeanol (5–236 μg/g) and 1,4-ipomeadiol (ND–1,406 μg/g). Macrophomina phaseoli and Sclerotium rolfsii induced accumulation of relatively high concentrations of ipomeamarone (ND–23.346 μg/g) and 4-ipomeanol (4–227 μg/g) but did not induce accumulation of 1,4-ipomeadiol. Mercuric acetate induced accumulation of low concentrations of total furanoterpenoids, ipomeamarone, 1-ipomeanol, 1,4-ipomeadiol. Fusarium oxysporum f. sp. batatas did not induce accumulation of furanoterpenoids in sweet potato vines. Concentrations of 4-ipomeanol and 1,4-ipomeadiol were highest in tissue infected with certain isolates of D. tubericola and F. solani. The ipomeanols accumulate in tissue infected by any of several sweet potato pathogens in conjunction with a general furanoterpenoid accumulation and are not specific degradation products of E. solani infection.