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Variations in the levels of major free cytokinins and free abscisic acid during tuber development of sweet potato

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Abstract

Changes in two plant growth substances were examined throughout tuber development of sweet potato (Ipomoea batatas Lam. cv. Minamiyutaka). Major free cytokinins [t-zeatin riboside, N6-(Δ2-isopentenyl)adenosine and 6-(3-methyl-2-butenyl amino)purine glucoside] and free abscisic acid in tubers were determined by HPLC and GC-ECD. An increase int-ZR almost coincided with the onset of rapid tuberization 30–90 days after planting the vine cuttings. The levels of i6Ado and ABA were much lower than that oft-ZR throughout tuber development. The maximum level of i6Ado preceded the maximum oft-ZR. The level of iPG was higher than that oft-ZR, and the pattern of changes in the level was more complex. The maximum level of iPG reached about 270 μg kg−1 fresh weight. Varied changes in the low levels of ABA appeared not to be related to tuber development. Longitudinal distribution of the cytokinins and ABA in the developing tubers showed that levels oft-ZR were higher in parts of the proximal side of the stem than in other, lower parts of the tubers.

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Authors and Affiliations

  1. Department of Horticulture, Kagoshima University, 890, Korimoto Kagoshima, Japan

    Tomoaki Matsuo, Hidehiko Mitsuzono, Ritsuko Okada & Saburo Itoo

Authors
  1. Tomoaki Matsuo
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  2. Hidehiko Mitsuzono
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  3. Ritsuko Okada
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  4. Saburo Itoo
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Matsuo, T., Mitsuzono, H., Okada, R. et al. Variations in the levels of major free cytokinins and free abscisic acid during tuber development of sweet potato. J Plant Growth Regul 7, 249–258 (1988). https://doi.org/10.1007/BF02025267

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  • DOI: https://doi.org/10.1007/BF02025267

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