Sweet potato single-leaf cuttings of cultivars ‘Centennial,’ ‘Jewel,’ and ‘Nemagold’ were planted in plastic pots containing steam-sterilized sand. Fully opened leaves were counted from the terminal apex on stock plant stems, and leaf positions 1 to 3 and 7 to 9 were referred to as mean leaf positions 2 and 8 respectively. Dry weight and its partitioning among plant organs (leaf, stem, petiole, new shoot, fibrous roots, and stronger roots) differed among the three cultivars. ‘Centennial’ had the highest storage root dry weights in both the first (December-March) and second (April-June) experiments. The new shoots and storage root dry rates of ‘Centennial’ and ‘Jewel’ were 3 to 25 times greater at 79 days after planting (DAP) in the second experiment than at 70 DAp in the first experiment. The new shoot was the dominant sink in ‘Nemagold’ between 28 and 70 DAP in the first experiment but not in the second experiment, and the storage root never became a strong sink in either experiment. A shift from leaf dry weight increases to decrease was observed in the first experiment but not in the second experiment.
Leaves in mean leaf position 2 showed higher original plant material (leaf, petiole, and stem) dry weight than mean leaf position 8, but there were no significant differences in final storage root dry weight between these two mean leaf positions in both experiments. Mean leaf positions 2 approximant net assimilation rate (NAR) values based on leaf and new shoot dry weight exceeded mean leaf positions 8 approximate NAR values in both experiments.
Plants with stem attachment had higher new shoot and storage root dry weights than plants without stem attachment. Dry weight of the original leaf decreased in plants with steam attachment but not in plants without stem attachment. / M.S.
| Identifer | oai:union.ndltd.org:VTETD/oai:vtechworks.lib.vt.edu:10919/106178 |
| Date | January 1987 |
| Creators | Fan, Wen-Nin |
| Contributors | Horticulture |
| Publisher | Virginia Polytechnic Institute and State University |
| Source Sets | Virginia Tech Theses and Dissertation |
| Language | English |
| Detected Language | English |
| Type | Thesis, Text |
| Format | vii, 89 leaves, application/pdf, application/pdf |
| Rights | In Copyright, http://rightsstatements.org/vocab/InC/1.0/ |
| Relation | OCLC# 17164846 |
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