Exogenous ethylene is commonly used as a commercial sprouting inhibitor of potato tubers. The role of ethylene in the control of sprouting of sweetpotato roots, however, is not known. The aim of this study was to investigate the role of ethylene in control of sprouting in sweetpotato roots by observing the effect of an ethylene synthesis inhibitor, aminoethoxyvinylglycine (AVG), and the ethylene antagonist, 1-methylcyclopropene (1-MCP), in the presence and absence of exogenous ethylene on root sprouting and associated sugar accumulation. Continuous exposure to 10 ?l L −1 ethylene, 24 h exposure to 625 nl L −1 1-MCP or dipping in 100 ?l L −1 AVG all inhibited sprout growth in sweetpotato roots of two varieties over 4 weeks of storage at 25 ◦ C.
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