ABSTRACT
Objective: The effects of the reproductive growth on the source-sink relationship and source-sink characteristic indexes of Alisma plantago-aquatica were studied in order to provide a potential reference for the cultural techniques of high yield and quality and breeding. Methods: The dry weight in each part and the content of non-structure carbohydrates and nitrogen compounds in the leaves and tubers from the wiping off bolting and bolting plant were tested; The accumulative process of physiological indexes was compared. Results: Reproductive growth could benefit the accumulation of reproductive sink, go against the increase of source of leaves and vegetative sink, and obviously increase the plant total storage capacity and the total biomass. Wiping off the reproductive growth could increase the C/N ratio in the leaves at the later stages of plant growth and the tubers during the yield formative period, and promote the production of the leaves and tubers. Conclusion: During the process of cultivation, it is supposed to promptly adjust the plant C/N ratio by artificial measures for increasing the tuber production. The strains with suitable amounts and high C/N ratio in the leaves and high nitrogen content in the tubers at the later stages of the plant growth should be chosen for breeding.