外生菌根真菌（EMF）耐铬的生理与分子机制研究
毕业论文关键词：外生菌根真菌；Cr胁迫；耐铬基因
Study on the Physiological and Molecular Mechanisms of Ectomycorrhizal Fungi Resistant Chromium
Student majoring in National Life Science and Technique Talent-training Base
Abstract: The effects of Cr treatment on the growth of EMF strain, the pH of fungi, the amount of organic acids secreted by fungi, the secretion and the key enzymes of organic acid secretion were studied in two strains of Pisolithus, which were different from Cr tolerance. The In addition, the Cr tolerance and the susceptible strains were analyzed before and after Cr treatment. The molecular mechanism of Cr (VI) reduction was studied by transcriptome analysis and gene differential expression. The results showed that EMF had the ability of Exoplasmic barrier and some adsorption capacity to Cr, and Cr (VI) could be reduced to Cr (III). At high concentration of Cr, the cells could be decomposed by oxalic acid and Cr Chelate the way to ease the poison. In the subsequent transcript group analysis, we also found that the 316 strains of specific strains of specific upregulation, comprehensive pre-experimental phenomenon concluded that this part of the up-regulated gene is on the high-priced chromium reduction part of the gene; at the same time according to the comparison of two strains of genetic differences, Resistant strains to increase isocitrate lyase activity related to 48 genes. The results of this study provide a theoretical basis for studying the physiological and molecular mechanisms of Cr resistance of ectomycorrhizal fungi
Key words: Ectomycorrhizal Fungi; anti-chromium traits; gene expression
目 录
摘要…1
关键词1
Abstract …1
Key words1
1 材料与方法…2
1.1 实验材料…2
1.1.1外生菌根真菌菌株2
1.1.2培养基…2
1.2耐铬菌株的筛选及耐铬能力的测定2
1.2.1耐铬菌株的筛选2
1.2.2 Cr胁迫对耐性与敏感菌株生长的影响…2
1.3 EMF对Cr的吸收与Cr(VI)还原能力的探究…2
1.3.1菌液与样品液的配制…2
1.3.2总Cr的测定…3
1.3.3 Cr(VI)含量的测定…3
1.4 Cr处理后菌液pH的变化…3
1.5 Cr对EMF分泌低分子量有机酸的影响…3
1.6 Cr处理前后有机酸分泌关键酶活性的检测分析…3
1.6.1苹果酸脱氢酶…3
1.6.2异柠檬酸裂解酶3
1.7转录组测序4
2 结果与分析….4
2.1 Cr耐性菌株和敏感菌株的筛选4
2.2原生质膜对Cr的屏障与吸收作用…5
2.3 EMF对Cr(VI)的还原作用6
2.4 Cr对外生菌根真菌分泌有机酸的影响…7
2.5 Cr处理前后调控有机酸（草酸）分泌的关键酶活性的变化…7
2.5.1苹果酸脱氢酶…7