Abstract
This paper reports the first unambiguous observation of the differentiation of proplastids to amyloplasts in shoot apical meristem during the tuberization of taro. The differentiation mechanism from proplastids to amyloplasts was examined during tuberization of taro. Shoot tips during in vitro tuberization of taro were sampled and observed every 2 days using a transmission electron microscope. The enlargement of proplastids, accumulation of thylakoids and grana were observed in the cells of shoot apical meristem. After 8 days of the culture, starch grains deposition was distinctly observed in the amyloplasts. Binary fission and budding mode of proplastid division were found at the beginning of tuberization in taro. However, binary fission was the only division type shown by the amyloplasts.
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