Abstract
Abstract Phloem cross-sectional areas (PCSA) in main stems and storage root stalks were determined for 3 cultivars of sweet potato [Ipomoea batatas (L.) Lam] for 98 days, starting 14 days after transplanting at 10-day intervals. As the number of storage roots increased, the total amount of phloem in the storage root stalks available for translocation was greater than that in the main stem. For the last 3 harvest periods, ‘Jasper’ was the only cultivar with less phloem in the storage root stalks than in the main stem. The correlation between PCSA of the storage root stalks and storage root weight was nonsignificant for ‘Jasper’ and ‘ Porto Rico’ but significant for ‘Centennial’, which suggested that the amount of phloem tissue is not critical for storage root development.
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