異なる高度の間で相互移植されたイタドリの形態的変化

抄録

Mature Polygonum cuspidatum Sieb. et Zucc. transplanted from basal elevation to higher elevations changed its growth form to dwarf with an increasing altitude of transplantation sites, but the plants from montane, subalpine, and alpine zones did not change theirs after transplanting into the montane zone was the most on the plants from the basal zone. It decreased with the increase of their original habitat's altitude. With the exception of leaves and stems of the plants from the alpine zone, the biomass rates of plants transplanted into basal and montane zones were nearly equal to specific values for the same organs in spite of their different original habitats. However, the biomass rates of the subterranean organ of the plants transplanted from basal and montane zones into the subalpine zone were smaller than the specific value for the organ. Morphological changes in P. cuspidatum shown by altitudinal transplantation suggest that the species has altitudinally various variants as an ecotype.