Abstract
SummarySetts of Dioscorea alata and D. rotundata sprouted as rapidly in dry soil, dry sawdust, or dry shredded newsprint as in moist sawdust. Sprouting was slightly less rapid when the setts were kept on a laboratory shelf. Sprouting loci were smaller but more numerous in the dry-sprouted setts. Sprout buds produced during dry-sprouting remained relatively unelongated when compared with moist-sprouted setts, but setts wetted after dry-soil sprouting for 14 days produced a greater number of vines per sett.When D. rotundatasetts obtained from 8-month stored tubers were subjected to alternating wetting and drying during sprouting, several sprouting loci developed into negatively geotropic, finger-like structures, rhizome-like in appearance but tuber-like in bulk.The cultural implications of the results are discussed, and a scheme is proposed for pre-sprouting yam setts indoors before planting them in the field.
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