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Potato tubers (Solanum tuberosum cv. Sebago) were stored at 20 °C in air containing ethylene at <0.005, 0.01, 0.1, 1.0, or 10 µL·L -1 and the level of sprouting was measured over 35 days. The time for tubers to develop an average of one sprout per tuber was found to linearly increase as the log10 ethylene concentration decreased with the effect present over the whole range of concentration. After 35 days of storage, the number of sprouts/tuber was inversely related to the ethylene concentration, but the weight of sprouts was only lower for tubers held in <0.005 µL·L-1 ethylene. The more numerous sprouts on tubers held in 10 µL·L-1 ethylene were short and thick, while the less numerous sprouts on tubers in 0.01-1.0 µL·L -1 were long, thin, and branched, and resulted in no signifi cant difference in total sprout weight between these concentrations. Reducing the concentration of ethylene in the atmosphere around stored potatoes thus reduced sprouting, but levels <0.01 µL·L-1 are required to minimize both sprout emer- gence and sprout growth. weeks and found sprouting was inhibited after the 2- and 3-week treatments, but promoted after the 4-week treatment. Rylski et al. (1974) found sprouting was inhibited by prolonged exposure to 2 µL·L -1 ethylene. No studies have been reported for prolonged exposure of potatoes to ethylene at <1 µL·L -1 , a level more likely to be encountered in commercial storage; ethylene at 0.04 µL·L -1 was found inside stacks of potato cartons held in the Syd- ney wholesale markets (V.V.V. Ku and R.B.H. Wills, unpublished data). This study examined the sprouting of potatoes during prolonged exposure to ethylene at concentrations in the range <0.005 to 10 µL·L -1 .

Effect of Low Levels of Ethylene on Sprouting of Potatoes in Storage