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利用营养液水培法,研究了5个阿特拉津(atrazine)浓度(1、2、4、8和16mg·L-1)下水葱(Scirpus tabernaemontani)鲜重、叶片相对含水量(RWC)、丙二醛(MDA)含量、过氧化物酶(POD)活性、根系活力和叶绿素含量等的变化。结果表明,水葱在阿特拉津胁迫下,鲜重、RWC、叶绿素含量均有不同程度的下降,根系活力和POD活性降低,同时MDA含量上升,膜脂过氧化程度加剧。由于阿特拉津的降解,这种不良影响随处理时间的延长而减弱。但其对叶绿素含量的影响具持久性;培养60天内,叶绿素含量仍显著低于正常水平。阿特拉津浓度越高,对水葱的植物毒性越高,当浓度高于8mg·L-1时,水葱的生长和生理活动受到显著影响(p<0.05);低于1mg·L-1时,与对照无显著差异。
Using nutrient solution hydroponics, the fresh weight of Scirpus tabernaemontani, leaf relative water content (RWC) and water content of five atrazine concentrations (1, 2, 4, 8 and 16 mg · L -1) , Malondialdehyde (MDA) content, peroxidase (POD) activity, root activity and chlorophyll content. The results showed that under the stress of atrazine, the fresh weight, RWC and chlorophyll contents of water onions decreased to some extent, the activities of root system and POD decreased, while the contents of MDA increased and the lipid peroxidation intensified. Due to the degradation of atrazine, this adverse effect diminishes as the treatment time increases. However, its effect on chlorophyll content has a lasting effect; within 60 days, the content of chlorophyll is still significantly lower than the normal level. The higher the concentration of atrazine, the higher the phytotoxicity of water onions. When the concentration was higher than 8 mg · L-1, the growth and physiological activities of water onions were significantly affected (p <0.05) 1, no significant difference with the control.