Abstract
Three day/night temperatures (30/15°, 24/19°, 17/12°) combined each with three levels of soiltemperatures (35°, 30°, 24° ; 30°, 24°, 17° ; 24°, 17°, 12°) were used to compare the growth and chemical composition in "Konnyaku" plant under these conditions. At favorable air-and/or soil-temperatures for the assimilates to translocate into the tuber, the sugar/mannose plus starch ratio and TAC concentrations of leaf-blade, leaf-stalk and roots were lowest, concurrently with the greatest growth of tuber and whole plant. The RGR was keenly correlated with NAR, the latter being highly correlated with the size of pallisade cells. In the regime of this experiment, 24° day air-temperature combined with 24° to 30° soil-temperatures were favorable for tuber-growth.
