| 韩航,陈雪娇,侯晓龙,刘爱琴,蔡丽平,周垂帆,马祥庆.Cd胁迫对类芦生长及酶活性的影响[J].农业环境科学学报,2016,35(4):647-653. |
| Cd胁迫对类芦生长及酶活性的影响 |
| Effects of cadmiumstresses on growth and antioxidant activities of Neyraudia reynaudiana |
| 投稿时间：2015-11-15 |
| DOI：10.11654/jaes.2016.04.006 |
| 中文关键词: 类芦 镉胁迫 形态响应 酶活性 吸收 |
| 英文关键词: Neyraudia reynaudiana cadmium stress phytoremediation antioxidant activity uptake |
| 基金项目:国家科技支撑计划项目(2014BAD15B02);国家自然科学基金项目(41401364);国家林业局林业公益性行业科研项目(201304303);农业高校产学合作科技重大项目(2013N5002);福建农林大学林学院院青年基金项目(6112C039J);福建省自然科学基金项目(2013J01073) |
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| 中文摘要: |
| 以类芦为材料,测定不同Cd胁迫浓度下类芦相关形态生理指标,探讨类芦在Cd污染矿区正常生长的响应机制。结果表明:低Cd浓度处理对类芦分蘖数、叶片数、株高、最大叶长有一定促进作用,随Cd浓度的增加,抑制作用逐渐增强;Cd胁迫对类芦根长和表面积有显著抑制作用,但对根平均直径(Cd≤100 mg·kg-1)和根体积(Cd≤50 mg·kg-1)有显著促进作用;Cd胁迫下类芦抗氧化酶活性下降,MDA含量升高,根系和地上部分生物量等指标均逐渐减小,阻碍了类芦的生长;不同Cd浓度胁迫下类芦根系及地上部分Cd含量逐渐增加,且转运系数大于1,对Cd具有一定富集能力。研究表明,Cd胁迫会抑制抗氧化酶活性等阻碍类芦正常生长,类芦通过调整生长格局、提高根系平均直径和表面积、刺激地上部分富集转运能力来适应Cd胁迫。 |
| 英文摘要: |
| Neyraudia reynaudiana is a hard plant that can grow in poor soil, even in heavy metal polluted soils. Here we examined physiological indexes of N. reynaudiana under different Cd stresses and discussed the response mechanisms of N. reynaudiana growth in Cd-polluted mining area. Low Cd concentrations had certain promotional effects on the number of tiller and leaf, the plant height and the maximum leaf length. However, increasing Cd concentrations caused inhibitory effects on plant. The length and surface area of N. reynaudiana roots were significantly inhibited even at low Cd stresses. However, the average diameter and volume of the roots were promoted by ≤100 mg Cd·kg-1 and ≤50 mg Cd·kg-1, respectively. Cadmium stresses reduced antioxidant activity, but increased MDA content of N.reynaudiana. Cadmium content gradually increased in the roots and aboveground parts of N. reynaudiana under different Cd stresses. Transfer coefficient of Cd was greater than one, indicating the accumulation ability of Cd by the plant. These findings indicate that Cd stresses inhibit the activity of antioxidant enzymes, resulting in the decreases in the growth of N. reynaudiana; however, N. reynaudiana could adapt the Cd stresses through adjusting the growth pattern, increasing root diameter and surface area and stimulating the transportation capacity of Cd to the aboveground. |
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