Key Laboratory of Mountain Environment Evolvement and Regulation, Institute of Mountain Hazards and Environment, Chinese Academy of Science, No. 9, Block 4, South Renmin Road, Chengdu 610041, China.
Ecotoxicol Environ Saf. 2011 Sep;74(6):1630-5. doi: 10.1016/j.ecoenv.2011.04.002. Epub 2011 Apr 15.
Antioxidative responses of the mosses Hypnum plumaeforme, Thuidium cymbifolium, and Brachythecium piligerum to short-term Pb and Ni stress were investigated. Both Pb and Ni treatment increased the formation of reactive oxygen species and lipid peroxidation, decreased superoxide dismutase (SOD), and catalase (CAT) activities in H. plumaeforme and T. cymbifolium. However, SOD activity in B. piligerum was increased under 10mM Pb stress and Ni increased CAT activity in B. piligerum under 1mM Ni stress. Peroxidase (POX) activity in the three mosses was increased by Pb and Ni exposure, indicating that POX plays an important role in preventing heavy metal-induced oxidative stress. The accumulation of O(2)(-) and H(2)O(2) in mosses is related to the decline in SOD and CAT activities. B. piligerum is the most sensitive and T. cymbifolium is the most tolerant species to Pb and Ni stress among the three bryophytes.
研究了短时间 Pb 和 Ni 胁迫对藓类植物羽藓、垂枝藓和密叶绢藓抗氧化反应的影响。Pb 和 Ni 处理均增加了活性氧物质的形成和脂质过氧化，降低了羽藓和垂枝藓中超氧化物歧化酶（SOD）和过氧化氢酶（CAT）的活性。然而，在 10mM Pb 胁迫下，B. piligerum 的 SOD 活性增加，在 1mM Ni 胁迫下，Ni 增加了 B. piligerum 的 CAT 活性。三种藓类植物的过氧化物酶（POX）活性均因 Pb 和 Ni 暴露而增加，表明 POX 在防止重金属诱导的氧化应激中发挥重要作用。O(2)(-)和 H(2)O(2)在藓类植物中的积累与 SOD 和 CAT 活性的下降有关。在这三种苔藓植物中，B. piligerum 对 Pb 和 Ni 胁迫最为敏感，而垂枝藓最为耐受。
