Abstract
Abstract The lower 15 cm (4 nodes) of vine tip cuttings of sweet potato (Ipomoea batatas (L.) Lam. cv Jewel) were planted in blasting sand and immersed in a full strength Hoagland’s nutrient solution to a height of either 5 or 15 cm. More roots were initiated at the two lower nodes and roots were more numerous and larger by 6-12 weeks in the 5 cm immersion level while at the 15 cm level more roots originated at the upper nodes. Endogenous ethylene (C2H4) increased in the stems of plants immersed to a height of 15 cm.
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