Cadmium stress on growth and resistance of hybrid tulip trees：Liriodendron chinense × Liriodendron tulipifera

Key words: 
• botany /
• cadmium（Cd） stress /
• Liriodendron chinense × Liriodendron tulipifera /
• physiological response /
• resistance

Abstract: To understand the resistant ability of tulip tree hybrid（Liriodendron chinense × Liriodendron tulipifera） under the soil Cd（cadmium） stress，annual seedlings from five families labeled NEF11 to NEF15 of tulip tree hybrid planted in plastic pots with 0，100 and 200 mg·kg-1 soil Cd stress were studied. The results showed that the leaves of the annual seedlings turned yellow and roots rotted as the Cd stress strengthened. There were very significant different among the five families to resistant the soil Cd stress. The membrane penetrability and malondialdehyde（MDA）content in the leaves increased with the Cd stress prolong and strengthened. Change tendency of SOD activities among the five families was different under 100 mg·kg-1 Cd stress，and the SOD activities increased at first and then decreased under 200 mg·kg-1 Cd stress. The SOD activities in NEF11 decreased the largest at last，and its decline rate was 41.5% over the ck（contrasting）. Subordinate function analysis for resistant ability to soil Cd stress of the five families was in the order: NEF14＞NEF15＞NEF12＞NEF13＞NEF11. [Ch，3 fig. 3 tab. 16 ref.]