Abstract: Our objective was to explore the effects of continued Al stress on growth and physiological characteristics of Nasturtium officinale and Myriophyllum aquaticum seedlings. Nasturtium officinale and Myriophyllum aquaticum seedlings were treated with continued Al₂(SO₄)₃·18H₂O(0,300,600,900,1 200 mg/kg)in plastic pots with soil.We studied the effects of continued Al stress on growth and physiological characteristics after 30 days.The results showed that with Al³⁺ treatment under 300 mg/kg,the Nasturtium officinale root length,root biomass,chlorophyll content reached the maximum peak,while the growth of Myriophyllum aquaticum was almost not affected by Al.Further study on physiological index found that with the increase of soil aluminum concentration, Nasturtium officinale membrane damage of malondialdehyde (MDA) content increased;relating the index of tolerance,with the soil aluminum concentration increasing,ascorbate peroxidase (APX) activity increased,soluble protein content (Pr),peroxidase (POD) activity,catalase (CAT) activity were increased first and then decreased;proline (Pro) content,superoxide dismutase (SOD) activity decreased.With the increase of soil aluminum concentration, Myriophyllum aquaticum Pr content tended to increase,SOD content increased first and then decreased,the other trend physiological characteristics were similar with Nasturtium officinale.The index showed, Nasturtium officinale was more sensitive to Al than Myriophyllum aquaticum.So there was some difference between Nasturtium officinale and Myriophyllum aquaticum when response to Al stress,but they have shown good growth characteristics,they have shown for aluminum stress better tolerated.

Key words: Aluminum stress, Nasturtium officinale R.Br., Myriophyllum aquaticum, Chlorophyll, Malondialdehyde, Proline, Antioxidase

CLC Number: 

• S63.01