Abstract
SummaryCurcuma alismatifolia has become popular as an ornamental plant because of its colourful, long-lasting, and repeated growth of inflorescences. The effects of temperature on N and C assimilation and transport during the initial flowering stage were investigated using 15N and 13C. Treatments at 15ºC, 25ºC, or 35ºC had no significant effect on total 15N absorption by the plants. However, the distribution of 15N was affected by temperature. The concentration of 15N in new rhizomes and leaves was lower at 15ºC than at 25ºC, although the concentrations of 15N in old rhizomes and old storage roots were higher. The concentration of 15N in roots and leaves was lower at 35ºC than at 25ºC. Total plant 13C concentrations were highest at 25ºC, followed by 15ºC, and lowest at 35ºC. The concentration of 13C in new rhizomes was the highest, followed by leaves and inflorescences at 25ºC. The concentrations and distribution of 13C in new rhizomes and in new storage roots were highest at 25ºC. These results indicate that temperature regulates the assimilation and transport of N and C, with the optimum temperature being between 25º – 35ºC.
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