Abstract
Localization of Si, P, K and Ca in hull during the ripening period was investigated by X-ray analysis. The results obtained are as follows: In the fertile hull Si was not found in the outer epidermis cells but in the part between the epidermis cells and the cuticle. However, 40 days after heading, in the sterile hull, Si was observed not only in the part mentioned above but also in the inner epiderm. Distribution of P, K and Ca was low in the part between the outer epidermis cells and the cuticle where Si was observed but more abundant in other parts as well as in the parenchyma. From these results, it was shown that the translocation of nutrient took place through the parenchyma, and the localization of Si showed a significant correlation with transpiration.
