Abstract:

To study the absorption and transfer of selenium in different organs of konjac at various growth stages by adding different concentrations of exogenous selenium into soil, the hybrid variety ‘Anmo128’ was selected as the material, and a pot experiment was carried out to detect the content of selenium in different organs at different growth stages of konjac by repeatedly watering the root of konjac with sodium selenite solution of different concentrations. The results show that: (1) in konjac leaf-spreading stage, with the increase of selenium concentration, the content of selenium of each organ gradually increases, with an order of bulb > petiole > leaves; (2) in konjac bulbous period, the content of selenium in each organ could reach the maximum value under different selenium concentrations, when the selenium concentration exceeds 16 mg/kg, the selenium content in leaves and bulbs significantly decreases, indicating that the high-selenium treatment could have an impact on the growth and development of plants; (3) with the increase of selenium concentration, the content of selenium in leaves, petioles and bulb shows a trend of accumulation first and then a decrease, and the content reaches the top when the concentration is 16 mg/kg; with the konjac growing to maturity, the selenium content in leaves and petioles presents a trend of transfer to the bulb; (4) the contents of selenium in leaves at different development stages are interactional, the selenium content in petiole is eventually transferred by other ways, and selenium has a tendency of transfer from other organs to the bulb. Therefore, the optimum selenium concentration range for the growth and development of konjac and the accumulation of selenium in each organ is≤16 mg/kg, and the contents of selenium in different organs of konjac at different growth stages have interaction and transfer.

Key words: konjac, exogenous selenium, different organs, selenium contents, enrichment and transfer, pot experiment