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A Quantitative Approach to Source Potentials and Sink Capacities Among Reciprocal Grafts of Sweet Potato Varieties¹

Economic yield of sweet potato, Ipomoea batatas L., may be limited by either photosynthetic source potential or tuberous root sink capacity. The relationships between source and sink were investigated quantitatively with special reference to the yield of dry tuberous root yield through the use of reciprocal grafts of a set of varieties in all possible combinations.

Responses of the sink to the source and of the source to the sink were examined. The varieties with large sink capacities showed greater responses of sinks to source than the varieties with poor sink capacities. The varieties with the greater source potential showed the greatest response of source to sink.

Source-sink relationships as determinants of yield in the sweet potato are discussed.

Key Words: Ipomoea batatas L. • Selection • Yield • Translocation

² Plant breeder and assistant director, Root and Tuber Improvement Program, International Institute of Tropical Agriculture (IITA), Ibadan, Nigeria.