AMF对Cd胁迫下虎尾草生长、生理特性及Cd积累的影响

Arbuscular Mycorrhizal Fungi impact on Chloris virgata growth, physiological characteristics and Cd accumulation under Cd stress

    摘要
  • 摘要: 以虎尾草为宿主植物，根内根孢囊霉和摩西斗管囊霉为菌剂，采用温室盆栽的方式进行Cd污染模拟试验，研究丛枝菌根真菌（AMF）对Cd胁迫下虎尾草生长、生理特性以及Cd积累的影响．结果表明：1)未接种AMF时，低质量分数Cd（5 mg·kg−1）能促进虎尾草的生长，高质量分数Cd（50 mg·kg−1）则抑制其生长；随着Cd2+质量分数增加，虎尾草的抗氧化酶活性（POD）、根系活力呈先上升后下降的趋势，可溶性糖、可溶性蛋白、叶绿素和丙二醛的含量呈上升趋势；2)无Cd胁迫时，AMF促进了虎尾草的生长，虎尾草的POD、可溶性糖含量增加；3)所有Cd胁迫处理下虎尾草地下部Cd质量分数大于地上部；接种AMF后，虎尾草地上Cd富集系数均增强；4)在一定Cd质量分数范围内，AMF提高了虎尾草的根系活力、POD、光合色素含量，增强了虎尾草对Cd的耐受性．本研究结果可为土壤Cd污染修复提供一定的实验依据．

     

    Abstract: Chloris virgata was used as the host plant and Rhizoctonia solani and Aspergillus niger as mycorrhizal agents, to mimic cadmium pollution in greenhouse pots． Arbuscular Mycorrhizal Fungi (AMF) impacts on growth, physiological characteristics, and cadmium accumulation of C. tigris under cadmium stress were studied． When not inoculated with AMF, low concentrations of cadmium (5 mg·kg−1) promoted C. tigris growth, but high concentrations (50 mg·kg−1) inhibited growth． With increasing Cd2+ concentrations, antioxidant enzyme activity (POD) and root vigor of C. tigris increased and then decreased, contents of soluble sugars, soluble proteins, chlorophyll, and malondialdehyde all increased． In the absence of cadmium stress, AMF promoted C. tigris growth, to increase the contents of POD and soluble sugar． Under cadmium stress, cadmium concentration in C. tigris was greater than the aboveground． After AMF inoculation, the aboveground cadmium concentration coefficients of C. tigris were enhanced． Within a certain cadmium concentration range, AMF increased the root vitality of C. tigris, POD contents and photosynthetic pigments, enhanced C. tigris tolerance to cadmium． This work will be helpful for the remediation of soil cadmium pollution．

     

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