盐胁迫对鸢尾叶片生理指标的影响

用质量分数分别为0、0.3%、0.6%、0.9%的NaCl营养液对德国鸢尾8#(Iris germanica‘white andblue’)和蓝蝴蝶(I.tectorum)植株进行根际盐胁迫,处理时间为4 d和8 d。结果表明:两种鸢尾受盐胁迫后,随着NaCl浓度提高和胁迫时间延长,叶片的质膜相对透性增大,而蓝蝴蝶的膜透性增大程度比德国鸢尾更为明显。MDA含量也是蓝蝴蝶高于德国鸢尾8#。说明了在盐胁迫下德国鸢尾8#叶片质膜受损伤的程度较轻。德国鸢尾8#叶内保护酶SOD活性及渗透调节物质脯氨酸和可溶性蛋白含量都显著高于蓝蝴蝶。研究证实了德国鸢尾8#比蓝蝴蝶具有相对较强的抗盐能力,其较小的质膜透性和MDA含量,较高的SOD活性和脯氨酸及可溶性蛋白含量是鸢尾属5个重要的抗盐生理指标。

Effects of Salt Stress on Some Physiological Indexes in Iris Leaves

Iris germanica 8~# and Iris tectorum were treated with different concentrations of NaCl solutions: 0,0.3%,0.6% and 0.9%.The samples were analyzed for salt resistance after 4 days and 8 days of contact time.The results showed that the relative permeability of plasma membrane and the MDA content of I.germanica 8~# were lower than I.tectorum.The SOD activity,proline and soluble protein contents of I.germanica 8~# were much higher than I.tectorum.This research confirms that I.germanica 8~# has a higher ability for salt resistance than that of I.tectorum.Low permeability and low MDA content,along with high SOD activity and high proline and soluble prolein contents are five important physiological indexes for salinity resistance in Iris L.