Abstract:

In this experiment，osmotic regulation substances，antioxidant substances and ion were compared between Lilium regale Wilson（salt tolerance）and‘Sorbonne’（salt sensitiveness）. The results showed that the change trend of these substances was the same in two lilies and L. regale Wilson produced more substances content than‘Sorbonne’. Soluble protein，proline content increased with the concentration of alkaline-salt（NaHCO₃）increasing. Soluble sugar and AsA content increased under lower concentration of NaHCO₃ stress，then decreased under higher concentration and the activities of SOD and GR had the same trend. The activities of APX and GSH content decreased sharply under higher concentration of NaHCO₃. Na⁺ mainly accumulated in middle leaves and upper leaves in‘Sorbonne’，but stem and middle leaves in L. regale Wilson. Middle leaves and upper leaves seemed to be main storage organs for Na⁺ in‘Sorbonne’，but stem and middle leaves in L. regale Wilson. Compared with‘Sorbonne’，L. regale Wilson had higher K⁺/Na⁺ ratios in root，middle leaves and upper leaves. The content of oxalic acid，lactic acid and acetic acid in L. regale Wilson increased，as well as malic acid and acetic acid in‘Sorbonne’. All the data indicated that compared with‘Sorbonne’，L. regale Wilson could increase SOD activity and AsA content under low concentration of NaHCO₃，increase soluble protein content and maintain established soluble sugar content under higher concentration of NaHCO₃，all of which are good explanations for its alkaline-salt tolerance.

Key words: lily, alkaline-salt stress, NaHCO3, osmotic regulation, antioxidant substances regulation, ion regulation, organic acid regulation