【摘要】 探究粉黛乱子草在不同质量浓度的铜溶液、锌溶液和铜锌复合溶液胁迫下,对种子萌发特性和抗氧特征的影响.结果表明,在3种胁迫处理下,粉黛乱子草的发芽率、发芽势和发芽指数呈先增后减的趋势;活力指数、胚苗长、胚根长和幼苗鲜重随处理溶液质量浓度的升高呈逐级递减的趋势,胚根长受到的抑制作用显著大于胚苗长.Cu²⁺(≥100 mg·L^-1)、Zn²⁺(≥200 mg·L^-1)、Cu²⁺+Zn²⁺[≥(200 mg·L^-1+200 mg·L^-1)]胁迫对粉黛乱子草种子萌发及幼苗生长具有显著的抑制作用（P<0.05）.粉黛乱子草叶片中的丙二醛含量与处理溶液质量浓度呈正比;随着3种胁迫处理溶液质量浓度的增高,过氧化氢酶、过氧化物酶和超氧化物歧化酶活性呈先增后减的趋势.粉黛乱子草抗氧化酶系统在Cu²⁺、Zn²⁺及Cu²⁺+Zn²⁺胁迫下响应机制不同,对不同重金属的抗性能力存在差异.通过隶属函数法进行综合评析,粉黛乱子草对3种重金属胁迫的耐受性强弱依次为Zn²⁺>Cu²⁺+Zn²⁺>Cu²⁺.更多还原

【Abstract】 Muhlenbergia capillaris seeds were subject to different concentrations of Cu²⁺, Zn²⁺ and Cu²⁺+Zn²⁺ composite aqueous solutions, and the impacts on growth performances and antioxidant enzyme activities were evaluated. The results showed that germination rate, germination potential and germination index of M.capillaris all raised and then fell under 3 types of stress. Vigor index, seedling length, radicle length and fresh weight of seedlings decreased gradually when the stress aggravated. The inhibition effect on radicle length was significantly greater than that of seedling length. Cu²⁺(≥100 mg· L^-1), Zn²⁺(≥200 mg·L^-1) and Cu²⁺+Zn²⁺ [≥(200 mg·L^-1+200 mg·L^-1)] stress significantly inhibited seed germination and seedling growth of M.capillaris（P<0.05）. Malondialdehyde contents in leaves were proportional to the stress magnitude. Activities of catalase, peroxidase and superoxide dismutase elevated first and then declined when iron concentrations increased. The antioxidant enzyme system varied among different types of stress, demonstrating a different resistance to heavy metal type. Based on comprehensive evaluation and subordination function method, plant′s resistance to Zn²⁺, Cu²⁺+Zn²⁺ composite and Cu²⁺ declined in turn.更多还原