Accumulation of Furanoterpenoids in Sweet Potato Tissue Following Inoculation with Different Pathogens

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Abstract
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 (58-2675 .mu.g/g), 4-ipomeanol (from not detectable [ND] to 112 .mu.g/g) and 1,4-ipomeadiol (ND-16 .mu.g/g). Plenodomus destruens, Diaporthe batatatis, Diplodia tubericola, Fusarium solani and Ceratocystis fimbriata induced accumulation of relatively high concentrations of ipomeamarone (63-16,523 .mu.g/g), 4-ipomeanol (5-236 .mu.g/g) and 1,4-ipomeadiol (ND-1406 .mu.g/g). Macrophomina phaseoli and Sclerotium rolfsii induced accumulation of relatively high concentrations of ipomeamarone (ND-23,346 .mu.g/g) and 4-ipomeanol (4-227 .mu.g/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. F. 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 F. solani infection.