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EGUCHI Toshihiko

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Environmental factors such as temperature, humidity and light intensity strongly affect crop productivity. To make an optimal condition for crop production, I am working on the elucidation of environmental effects on the growth and development of storage organs in crop plants, especially in sweetpotatoes. A storage root, or a tuberous root, of sweetpotato is a root having a region of localized thickening, and the storage organ grows below ground. I developed a new method for on-line measurement of diurnal change in tuberous root growth under the controlled environments. This system is also applicable for the growth analysis of potato tuber. By using the system, I found that the tuberous root growth was affected by humidity condition of the shoot through leaf transpiration. Temperature condition of the fibrous root also had a strong effect on the tuberous root growth as well as tuberous root temperature. Furthermore, I am trying to elucidate the mechanism of the tuberous root formation. I have already obtained the cultivation technique that ensures the formation of the storage organ in a specific part of a specific root. I am searching exogenous and endogenous factors required for the tuberous root formation using the technique now.

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