干旱胁迫对3种槭树科植物生理特性的影响

以鸡爪槭Acer palmatum，复叶槭Acer negundo和羽毛槭Acer palmatumDissectum 2年生实生苗为试材，采用聚乙二醇6000（PEG 6000）模拟干旱胁迫方法，研究干旱胁迫对鸡爪槭、复叶槭、羽毛槭幼苗生理特性的影响。结果显示:随着干旱胁迫程度的增强，3种槭树科Aceraceae植物幼苗总生物量、地上生物量、根生物量呈降低趋势；根冠比、丙二醛（MDA）质量摩尔浓度、脯氨酸（Pro）质量分数逐渐增加；鸡爪槭和羽毛槭叶片过氧化物酶（POD）活性先升高后降低，复叶槭过氧化物酶活性持续升高；羽毛槭叶片超氧化物歧化酶（SOD）活性呈先升后降的趋势，其他2 种则持续升高。3种槭树科植物幼苗均可通过调节自身生物量、MDA质量摩尔浓度、游离脯氨酸质量分数以及提高保护酶活性来适应轻度和中度干旱胁迫环境；通过隶属函数综合评价分析，3种槭树科植物幼苗耐旱性由强到弱为复叶槭＞鸡爪槭＞羽毛槭。图4表2参11

Effect of drought stress on physiological characteristics of three plants of Aceraceae

The effect of drought stress on physiological characteristics of three Aceraceae species, namely, Acer palmatum, Acer negundo, Acer palmatum Dissectum were studied, an experiment was conducted using 2-year-old seedlings with polyethylene glycol （PEG 6000） simulated drought stress. Results showed that with the enhancement of drought stress intensity, the total biomass, above ground biomass, and root biomass of three plants of Aceraceae plants tend to decrease, while root-shoot ratio, malondialdehyde （MDA） content, and proline content increased gradually; the peroxidase activity in Acer palmatum and Acer palmatum Dissectum increased first and then decreased, but continuously elevated in Acer negundo; the superoxide dismutase activity in Acer palmatum Dissectum increased first and then decreased, while the other two continuously elevated. Conclusions showed that three plants of Aceraceae seedlings adapt to mild and moderate drought stress through adjust its own biomass, MDA content, free proline content and improve protective enzyme activity; through membership function comprehensive evaluation and analysis, the drought tolerance of three plants of Aceraceae plants from high to low is: Acer negundo ＞ Acer palmatum ＞ Acer palmatum Dissectum.［Ch, 4 fig. 2 tab. 11 ref.］