Abstract

This study was conducted to determine the variation of growth and propagule production in the response of 19 clones of Sagittaria trifolia L., collected from six locations in southern Kyoto Prefecture, to four levels of nitrogen application (0, 8, 16 and 32kg/10a). Clonal variation was found in the nitrogen response to plant growth. Both sexual reproduction by achenes and vegetative reproduction by tubers increased with the increase in plant growth. The pattern of increase differed among the clones. The nitrogen response pattern differed according to the characteristics mentioned above. The increasing extent of sexual reproduction was higher than that of the vegetative one.The relationship between dry weight of the heaviest tuber and the number of tubers per ramet differed extensively among the clones. The nitrogen response of this relationship also differed. Of the 19 clones, 7 increased only in number, while 12 increased in both number and dry weight of the heaviest tuber. Although the heaviest tuber weight differed among the nitrogen levels, except in the case of two clones showing poor growth at 32N, the different nitrogen levels scarcely affected the frequency distribution of tuber weight.Based on the four characteristics of plant length, achene production, tuber production and the relationship between dry weight of the heaviest tuber and the number of tubers per ramet, the 19 clones were divided into four patterns. Intra-locational variation of these patterns was recognized in three of the six locations examined.

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