泽泻和慈姑叶片对低温胁迫的响应

以泽泻和慈姑叶片为试验材料,研究其在0、-10、-15、-20℃低温胁迫下叶片中可溶性糖(WSC)、游离脯氨酸(Pro)含量、过氧化物酶(POD)、过氧化氢酶(CAT)活性及相对电导率等5个生理生化指标的变化。结果表明,在0℃时2个植物的POD和CAT活性显著增加,之后随温度的降低而下降,在-20℃无活性。随着温度的降低,叶片相对电导率、可溶性糖和脯氨酸含量均有所增加,但增加幅度不同,综合5项指标分析得出,慈姑的抗寒性强于泽泻。

Effects of low temperature stress on leaves of Alisma orientale and Sagittaria sagittifolia

The leaves of two alismataceae plants were used to study the changes of soluble sugar,proline content,peroxidase (POD),catalase activity(CAT)and the relative conductivity under the different low tem-perature stress (0 ℃,-10 ℃,-15 ℃,-20 ℃).The results showed two plants have a significant increase in the activity of POD and CAT at 0 ℃.The activity of POD and CAT decreased with decreasing temperature,and there was no activity of both components at -20 ℃.But,the activity of POD and CAT in S .sagittifolia were higher than that in A.orientale at same temperature.With increasing low temperature stress,the contents of rel-ative conductivity,soluble sugar and proline in leaves were increased,but,the extent of increase was different. Baes on the integrated five indexes,the cold resitance of S .sagittifolia were stronger than A.orientale .