谷子及其根际土壤微生物群落对铬胁迫的响应机制

doi:10.17521/cjpe.2022.0049

植物生态学报 ›› 2023, Vol. 47 ›› Issue (3): 418-433.DOI: 10.17521/cjpe.2022.0049

所属专题：光合作用；微生物生态学

谷子及其根际土壤微生物群落对铬胁迫的响应机制

白雪, 李玉靖, 景秀清, 赵晓东, 畅莎莎, 荆韬羽, 刘晋汝, 赵鹏宇()

太原师范学院生物科学与技术学院, 山西晋中 030619

收稿日期:2022-02-02 接受日期:2022-06-22 出版日期:2023-03-20 发布日期:2022-07-15
通讯作者: 赵鹏宇
作者简介:* (394382557@qq.com)
基金资助:
山西省重点研发项目(20163D221008-1);山西省高等学校科技创新项目(2020L0535);服务流域生态治理产业创新学科集群建设(山西省“1331工程”)

Response mechanisms of millet and its rhizosphere soil microbial communities to chromium stress

BAI Xue, LI Yu-Jing, JING Xiu-Qing, ZHAO Xiao-Dong, CHANG Sha-Sha, JING Tao-Yu, LIU Jin-Ru, ZHAO Peng-Yu()

College of Biological Sciences and Technology, Taiyuan Normal University, Jinzhong, Shanxi 030619, China

Received:2022-02-02 Accepted:2022-06-22 Online:2023-03-20 Published:2022-07-15
Contact: ZHAO Peng-Yu
Supported by:
Key Research and Development Program of Shanxi Province(20163D221008-1);Science and Technology Innovation Programs of Higher Education Institutions in Shanxi(2020L0535);Construction of Innovation Discipline Cluster Servicing Valley Ecological Governance Industry (Shanxi “1331 Project”)

摘要/Abstract

摘要：

重金属铬(Cr)污染对农田中农作物产生毒害作用并破坏土壤微生物群落稳态, 但不同农作物及其根际土壤微生物群落对Cr胁迫的响应机制均有所差异。该研究在时间序列上分析Cr胁迫对谷子(正名: 粱, Setaria italica)长势、谷子差异表达基因(DEGs)的功能途径及土壤微生物群落结构和功能等方面的影响, 阐明谷子及土壤微生物群落的响应机制, 为Cr胁迫下的谷子生长及污染土壤的生态修复治理提供理论依据。基于室内盆栽实验, 以谷子幼苗和种植谷子的土壤为实验材料, 在Cr胁迫前(CK)及胁迫后6 h和6 d (Cr_6h、Cr_6d)的时间序列上分别进行样本采集, 同时测量幼苗生理性状指标及土壤理化指标。通过转录组分析, 研究Cr胁迫时间序列上谷子幼苗基因表达及所富集的功能途径的变化趋势; 通过高通量测序分析, 研究Cr胁迫时间序列上土壤微生物群落结构、物种多样性、群落功能的动态变化过程及与土壤理化性质的相关性。结果发现: 1)转录组分析结果表明Cr胁迫诱导基因表达上调(上调DEGs 54%); Gene Ontology (GO)富集分析表明DEGs在CK和Cr_6h、Cr_6h和Cr_6d样本对中与光合作用相关的基因的表达显著下调; 在Cr_6h和Cr_6d样本对中与防御和损伤调控相关的基因的表达显著上调, 细胞壁及细胞膜和细胞分裂相关基因的表达下调。2)高通量测序结果表明Cr胁迫时间序列上土壤细菌与真菌在门、属水平组成变化显著; 细菌群落α多样性呈现出由应激到稳定的阶段性变化特征(CK、Cr_6h和Cr_6d的Shannon多样性指数分别为6.09、5.93和6.05; Simpson多样性指数分别为0.006 8、0.007 8和0.006 8; Chao多样性指数分别为2 818.49、2 630.73和2 769.38), 而真菌群落α多样性显著下降(Shannon-Wiener多样性指数分别为4.17、3.81和3.23); 细菌与真菌群落的β多样性在Cr胁迫时间序列的分布差异显著。3)土壤理化性质与微生物群落相关性分析表明土壤理化因子与多种真菌群落显著相关, 而与细菌群落的关联关系较弱。结果表明Cr胁迫在时间序列上通过降低叶绿素含量、光系统活性并影响类囊体等结构组分显著抑制了谷子幼苗的光合作用过程, 通过下调细胞壁及微管相关组分基因表达抑制叶片细胞的增殖分化过程, 但同时激活了植物防御系统以降低自身所受的毒害作用。同时土壤细菌与真菌群落通过群落组成结构及多样性的变化来适应Cr胁迫, 二者在胁迫时间序列上的响应程度和策略均有所不同。

关键词: 重金属胁迫, 时间序列, ‘晋谷21号’, 微生物群落, 高通量测序, 转录组分析

Abstract:

Aims Heavy metal chromium (Cr) contamination has toxic effects on crops and will disrupt soil microbial community homeostasis in agricultural soils. Nevertheless, the mechanisms underlying the responses of different crops and their rhizosphere soil microbial communities to Cr stress were different. By using time series data, this study analyzed the effects of Cr stress on ‘Jingu 21’ growth, functional pathways of differentially expressed genes (DEGs) in cereals and soil microbial community structure and function. Our objective was to elucidate the response mechanism of millet (Setaria italica) and soil microbial community, and provide a theoretical basis for the growth of cereals under Cr stress and the ecological restoration of the contaminated soil.

Methods We collected millet seedlings and soil samples from the pot experiments with planted millet before (CK) and 6-hour and 6-day after Cr stress (Cr_6h, Cr_6d), and determined the physiological traits of seedlings and soil physicochemical properties. The gene expression and the functional pathways enriched in the seedlings were investigated by transcriptome analysis; the dynamics of microbial community composition, structure, diversity as well as function in time series and their correlations with soil physicochemical properties were studied by high-throughput sequencing analysis.

Important findings 1) Transcriptome analysis showed that Cr stress induced up-regulation of gene expression (54% for up-regulated DEGs); GO enrichment analysis showed that DEGs significantly down-regulated the expression of photosynthesis-related genes in CK & Cr_6h, Cr_6h & Cr_6d samples, and also significantly up-regulated the expression of defense and damage regulation-related genes, and down-regulated the expression of cell wall and cell membrane and cell division-related genes in Cr_6h & Cr_6d samples. 2) High-throughput sequencing revealed a significant change in the composition of soil bacterial and fungal communities at the phylum and genus level during the time series of Cr stress. The α diversity of bacterial communities showed a phase change from stress to stability (Shannon-Wiener diversity index for CK, Cr_6h, Cr_6d were 6.09, 5.93, 6.05, respectively. Simpson diversity index for CK, Cr_6h, Cr_6d were 0.006 8, 0.007 8, 0.006 8, respectively; Chao diversity index for CK, Cr_6h, Cr_6d were 2 818.49, 2 630.73, 2 769.38, respectively), while the α diversity of fungal community decreased significantly (Shannon-Wiener diversity index for CK, Cr_6h, Cr_6d were 4.17, 3.81, 3.23, respectively). The distribution of β diversity of bacterial community in the Cr stress time series was significantly different from that of fungal community. 3) Correlation analysis between soil physicochemical properties and microbial communities showed that soil physicochemical factors were significantly correlated with a variety of fungal flora, but weakly correlated with bacterial flora. Cr stress significantly inhibited the photosynthesis of millet seedlings by reducing chlorophyll content, photosystem activity and affecting structural components such as thylakoid, and inhibited the proliferation and differentiation of leaf cells by down-regulating the expression of cell wall and microtubule-related components. At the same time, Cr stress also activated the plant defense system to overcome toxicity. Meanwhile, soil bacterial and fungal communities adapted to Cr stress through changing community composition and diversity, and their response levels and strategies differed in the stress time series.

Key words: heavy metal stress, time series, ‘Jingu 21’, microbial community, high-throughput sequencing, transcriptome analysis

白雪, 李玉靖, 景秀清, 赵晓东, 畅莎莎, 荆韬羽, 刘晋汝, 赵鹏宇. 谷子及其根际土壤微生物群落对铬胁迫的响应机制. 植物生态学报, 2023, 47(3): 418-433. DOI: 10.17521/cjpe.2022.0049

BAI Xue, LI Yu-Jing, JING Xiu-Qing, ZHAO Xiao-Dong, CHANG Sha-Sha, JING Tao-Yu, LIU Jin-Ru, ZHAO Peng-Yu. Response mechanisms of millet and its rhizosphere soil microbial communities to chromium stress. Chinese Journal of Plant Ecology, 2023, 47(3): 418-433. DOI: 10.17521/cjpe.2022.0049

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链接本文: https://www.plant-ecology.com/CN/10.17521/cjpe.2022.0049

https://www.plant-ecology.com/CN/Y2023/V47/I3/418

图/表 9

表1 铬(Cr)胁迫下土壤理化性质(平均值±标准差)

Table 1 Soil physical and chemical properties under chromium (Cr) stress (mean ± SD)

指标 Index	对照 Control	Cr胁迫6 h Cr stress for 6 h	Cr胁迫6 d Cr stress for 6 d
氮含量 Nitrogen content (mg·kg^-1)	38.89 ± 8.27^b	34.28 ± 3.43^b	80.83 ± 6.56^a
磷含量 Phosphorus content (mg·kg^-1)	53.83 ± 12.17^b	48.17 ± 5.50^b	111.28 ± 10.45^a
钾含量 Potassium content (mg·kg^-1)	117.34 ± 28.51^b	111.33 ± 11.71^b	262.00 ± 25.32^a
电导率 Electrical conductivity (us·cm^-1)	743.61 ± 127.88^b	663.89 ± 79.75^b	1628.78 ± 113.72^a
pH	6.90 ± 0.08^b	7.04 ± 0.12^b	7.29 ± 0.13^a

图1 铬(Cr)胁迫后谷子幼苗形态的变化。CK, 对照; Cr_6d, Cr胁迫6 d; Cr_6h, Cr胁迫6 h。

Fig. 1 Morphology changes of Setaria italica seedlings after chromium (Cr) stress. CK, control; Cr_6d, chromium stress for 6 d; Cr_6h, Cr stress for 6 h.

表2 铬(Cr)胁迫时间序列上谷子长势及生物量测定(平均值±标准差)

Table 2 Setaria italica growth and biomass determination in the chromium (Cr) stress time series (mean ± SD)

指标 Index	对照 Control	Cr胁迫6 h Cr stress for 6 h	Cr胁迫6 d Cr stress for 6 d
茎长 Stem length (cm)	5.86 ± 0.55^b	5.52 ± 0.55^b	7.73 ± 1.12^a
根长 Root length (cm)	4.18 ± 0.81^a	3.64 ± 0.23^a	3.83 ± 0.75^a
干质量 Dry mass (g)	0.003 1 ± 0.000 5^b	0.003 4 ± 0.000 5^b	0.005 0 ± 0.000 6^a
鲜质量 Fresh mass (g)	0.028 3 ± 0.005 3^b	0.029 4 ± 0.002 6^b	0.037 8 ± 0.005 1^a
叶绿素含量 Chlorophyll content (SPAD)	24.68 ± 1.70^a	18.84 ± 1.77^b	16.34 ± 2.00^b
氮含量 Nitrogen content (mg·g^-1)	7.49 ± 0.51^a	6.19 ± 0.52^b	5.45 ± 0.58^b

图2 铬(Cr)胁迫时间序列上谷子叶片中的差异表达基因(DEGs)。A-C, CK、Cr_6h、Cr_6d处理中谷子叶片DEGs火山图。蓝点、红点、灰点分别代表下调、上调和无显著变化基因。D, 不同处理谷子叶片中的DEGs Venn图。E, Cr胁迫下谷子叶片中DEGs的GO注释分析。CK, 对照; Cr_6d, Cr胁迫6 d; Cr_6h; Cr胁迫6 h。FC, 差异表达倍数; pa, 矫正的p值。

Fig. 2 Differentially expressed genes (DEGs) in leaves of Setaria italica in the chromium (Cr) stress time series. A-C, Volcano plots of DEGs in leaves of S. italica from three sample pairs. The blue, red and gray dots represent down-regulated, up-regulated and no significant change genes, respectively. D, Venn diagram showing the effect of different samples on DEGs in leaves of S. italica. E, GO annotation analysis of DEGs in leaves of S. italica under Cr treatment. CK, control; Cr_6d, Cr stress for 6 d; Cr_6h, Cr stress for 6 h. FC, differential expression multiple; pa, the adjusted p value.

图3 铬(Cr)胁迫下谷子叶片中差异表达基因(DEGs)的Gene Ontology (GO)富集分析。down, 下调; up, 上调。CK, 对照; Cr_6d, Cr胁迫6 d ; Cr_6h, Cr胁迫6 h。9-cis-epoxycarotenoid dioxygenase activity, 9-顺式-环氧类胡萝卜素双加氧酶活性; Alcohol group as acceptor, 醇基作为受体; Amylase activity, 淀粉酶活性; Amylopectin maltohydrolase activity, 支链淀粉麦芽糖水解酶活性; Anchored component of membrance, 膜的锚定成分; Anchored component of plasma membrane, 质膜的锚定成分; Apoplast, 质外体; Beta-amylase activity, β-淀粉酶活性; Catalytic activity, 催化活性; Cell redox homeostasis, 细胞氧化还原稳态; Cell wall organization or biogenesis, 细胞壁组织或生物发生; Cellular aromatic compound metabolic, 细胞芳香族化合物代谢; Chlorophy II binding, 叶绿素II结合; Chloroplast envelope, 叶绿体包膜; Chloroplast thylakoid membrance, 叶绿体类囊体膜; Cloroplast organization, 叶绿体组织; Containing compound metabolic process, 含复合代谢过程; Containing compound metabolic process, 含化合物代谢过程; Disulfide oxidoreductase activity, 二硫键氧化还原酶活性; DNA replication initiation, DNA复制起始; DNA replication, DNA复制; DNA-binding transcription factor activity, DNA结合转录因子活性; Electron transport chain, 电子传递链; Exoribonuclease complex, 外核糖核酸酶复合物; Exosome (RNase complex), 外泌体(核糖核酸酶复合物); Hetercycle metabolic process, 杂环代谢过程; Hydrogen peroxide catabolic process, 过氧化氢分解代谢过程; Hydrogen peroxide metabolic process, 过氧化氢代谢过程; Isoprenoid catabolic process, 类异戊二烯分解代谢过程; Jasmonic acid mediated signaling pathway, 茉莉酸介导的信号通路; Kinase activity, 激酶活性; Kinesin complex, 驱动蛋白复合物; Light harvesting in photosystem I, 光系统I光捕获; Magnesium-dependent protein serine, 镁依赖性蛋白丝氨酸; MCM complex, MCM复合物; Microtubule associated complex, 微管相关复合物; Microtubule, 微管; Microtubule-based movement, 基于微管的运动; Mitochondrial RNA metabolic process, 线粒体RNA代谢过程; Mitochondrial RNA modification, 线粒体RNA修饰; Movement of cell or subcellular component, 细胞或亚细胞成分的运动; mRNA modification, mRNA修饰; ncRNA metabolic processing, ncRNA代谢过程; ncRNA processing, ncRNA加工; Nuclear exosome (RNase complex), 核外泌体(核糖核酸酶复合体); Nucleolus, 核仁; Oxidoreductase activity acting on a sulfur group, 作用于硫的氧化还原酶活性; Oxidoreductase activity, 氧化还原酶活性; Phosphatase activity, 磷酸酶活性; Phosphoric ester hydrolase activity, 磷酸酯水解酶活性; Phosphorus metabolism process, 磷代谢过程; Phosphprylation, 磷酸化; Photosynthesis dark reaction, 光合作用暗反应; Photosynthesis light harvesting, 光合作用光捕获; Photosynthesis light reaction, 光合作用光反应; Photosynthesis, 光合作用; Photosynthetic membrane, 光合膜; Photosystem I, 光系统I; Photosystem II oxygen evolving complex, 光系统II氧演替复合物; Photosystem, 光系统; Photosythetic electron transport chain, 光合电子传递链; Plastic organization, 塑料组织; Plastid envelope, 质体包膜; Plastid processing, 质体加工; Plastid thylakoid membrance, 质体类囊体膜; Polymeric cytoskeletal fiber, 聚合细胞骨架纤维; Pre-replicative complex assembly in cell, 细胞内复制前复合物组装; Pre-replicative complex assembly, 复制前复合物组装; Preribosome, nucleolus, 前核糖体; Protein disulfide oxidoreductase activity, 蛋白质二硫键氧化还原酶活性; Protein kinase activity, 蛋白激酶活性; Protein serine/threonine kinase activity, 蛋白丝氨酸/苏氨酸激酶活性; Protein-chromophore linkage, 蛋白质-发色团键; Protein-chromophore linkage, 蛋白质-发色团连接; Reactive oxygen species metabolic process, 活性氧代谢过程; Reductive pentose-phosphate cycle, 还原性戊糖-磷酸循环; Regulation of defense response, 防御反应的调节; Response to abiotic stimulus, 对非生物刺激的反应; Response to heat, 对热的反应; Response to radiation, 对刺激的反应; Response to wounding, 对创伤的反应; RNA modification, RNA修饰; RNA processing, RNA加工; RNA surveillance, RNA监测; rRNA metabolic processing, rRNA代谢加工; rRNA modification, rRNA修饰; rRNA processing, rRNA加工; Sesquiterpenoid biosynthetic process, 倍半萜类生物合成过程; Sesquiterpenoid metabolic process, 倍半萜类代谢过程; SnoRNA 3?-end processing, snoRNA 3?端加工; snoRNA processing, snoRNA加工; snRNA metabolic process, snRNA代谢过程; Supramolecular fiber, 超分子纤维; Supramolecular polymer, 超分子聚合物; Thylakoid membrane, 类囊体膜; Transcription regulator activity, 转录调节活性; Transferase activity, 转移酶活性; U4 snRNA 3?-end processing, U4 snRNA 3?端加工; UDP-glycosyltransferase activity, UDP-糖基转移酶活性。pa, 矫正的p值。

Fig. 3 Gene Ontology (GO) enrichment analysis of differentially expressed genes (DEGs) in chromium (Cr) stressed Setaria italica leaves. pa, the adjusted p value. CK, control; Cr_6d, Cr stress for 6 d; Cr_6h, Cr stress for 6 h.

图4 铬(Cr)胁迫时间序列上谷子根际土壤细菌和真菌群落门水平与属水平群落结构及群落间差异。A、B, 细菌和真菌Venn图。图中的数字代表的是不同分组中分类操作单元的个数。C、D, 细菌和真菌门水平群落组成。E、F, 细菌和真菌属水平群落组成。CK, 对照; Cr_6d, Cr胁迫6 d; Cr_6h, Cr胁迫6 h。不同小写字母表示各处理间差异显著(p < 0.05)。

Fig. 4 Community structure and inter-community differences between bacterial and fungal communities in the rhizosphere soil of Setaria italica at phylum level and genus level in the chromium (Cr) stress time series. A, B, Bacterial and fungal Venn diagrams. Numbers in these figures represent the number of operational taxonomic units in different groups. C, D, Bacterial and fungal phylum-level community composition. E, F, Bacterial and fungal genus-level community composition. CK, control; Cr_6d, Cr stress for 6 d ; Cr_6h, Cr stress for 6 h. Different lowercase letters indicate significant differences among treatments (p < 0.05).

图5 铬(Cr)胁迫时间序列上土壤中细菌(A、C)与真菌(B、D)群落的α多样性及β多样性。A、B, 细菌和真菌群落的α多样性。不同小写字母表示不同处理间差异显著(p < 0.05)。C、D, 细菌和真菌群落的β多样性, 两样本点越接近, 表明两样本物种组成越相似。CK, 对照组; Cr_6d, Cr胁迫6 d ; Cr_6h, Cr胁迫6 h。Stress为反映模型合适程度的指标。

Fig. 5 Analysis of α-diversity and β-diversity of bacterial (A, C) and fungal (B, D) communities in the chromium (Cr) stress time series. A, B, α-diversity of bacterial and fungal communities. Different lowercase letters mean significant differences among treatments (p < 0.05). C, D, β-diversity of bacterial chromium fungal community. The closer the points of two samples, the more similar the species composition of the two samples. CK, control; Cr_6h, Cr stress for 6 h; Cr_6d, Cr stress for 6 d. Stress is a metric reflecting the suitability of the model.

图6 土壤理化因子与细菌(A)和真菌(B)群落的相关性分析。EC, 电导率; K, 钾含量, N, 氮含量; P, 磷含量。圆形点的大小表示相关系数的大小, 颜色表示相关系数的正负, 正方形色块表示相关性检验的p值。

Fig. 6 Correlation analysis of soil physicochemical factors with bacterial (A) and fungal (B) communities。EC, electrical conductivity; K, potassium content, N, nitrogen content; P, phosphorus content. The size of the circular dots indicates the magnitude of the correlation coefficient, the color indicates the positive or negative correlation coefficient, and the square color block indicates the p value of the correlation test.

表3 铬(Cr)胁迫时间序列上土壤微生物群落的功能预测分析(平均值±标准差)

Table 3 Functional prediction analysis of soil microbial community in the chromium (Cr) stress time series (mean ± SD)

功能分组 Guild		对照 Control	Cr胁迫6 h Cr stress for 6 h	Cr胁迫6 d Cr stress for 6 d
细菌 Bacterial	全局和概述 Global and overview maps	34 369 841.00 ± 4 720 050.73^a	34 518 331.33 ± 3 830 827.80^a	35 436 018.33 ± 2 851 467.46^a
	碳水化合物代谢 Carbohydrate metabolism	7 915 005.25 ± 1 088 978.09^a	7 977 677.58 ± 893 493.00^a	8 182 307.00 ± 66 8193.19^a
	氨基酸代谢 Amino acid metabolism	7 063 478.92 ± 966 823.00^a	7 092 711.17 ± 792 150.10^a	7 279 350.08 ± 586 179.57^a
	能量代谢 Energy metabolism	3 723 520.25 ± 510 073.28^a	3 742 113.67 ± 409 484.99^a	3 833 272.92 ± 303 226.45^a
	辅助因子和维生素代谢 Metabolism of cofactors and vitamins	3 596 104.96 ± 488 259.88^a	3 580 709.88 ± 393 862.62^a	3 674 852.42 ± 301 407.93^a
真菌 Fungal	未定义的腐生菌 Undefined saprotroph	11 919.33 ± 1 237.78^a	9 633.50 ± 2 636.32^a	18 537.33 ± 10 095.58^a
	动物病原体-内生菌-植物病原体-未定义腐生菌 Animal pathogen-endophyte-plant pathogen- undefined saprotroph	10 675.17 ± 1 585.46^ab	12 060.50 ± 1 946.59^a	7 946.33 ± 3 433.26^b
	动物病原体-粪便腐生菌-内生菌-附生植物- 植物腐生菌-木材腐生菌 Animal pathogen-dungsaprotroph-endophyte- epiphytelant saprotroph-wood saprotroph	7 631.33 ± 1 345.52^a	9 334.50 ± 2 107.57^a	6 545.83 ± 4 562.01^a
	植物病原体 Plant pathogen	10 021.17 ± 2 090.68^a	5 757.83 ± 1763.85^b	4 860.67 ± 2 198.03^b
	动物病原体-内生菌-地衣寄生虫-植物病原体- 土壤腐生菌-木材腐生菌 Animal pathogen-endophyte-lichen parasite-plant pathogen-soil saprotroph-wood saprotroph	1 255.17 ± 416.48^a	1 119.50 ± 217.63^a	11 740.17 ± 17 952.63^a

表3 铬(Cr)胁迫时间序列上土壤微生物群落的功能预测分析(平均值±标准差)

Table 3 Functional prediction analysis of soil microbial community in the chromium (Cr) stress time series (mean ± SD)

功能分组 Guild		对照 Control	Cr胁迫6 h Cr stress for 6 h	Cr胁迫6 d Cr stress for 6 d
细菌 Bacterial	全局和概述 Global and overview maps	34 369 841.00 ± 4 720 050.73^a	34 518 331.33 ± 3 830 827.80^a	35 436 018.33 ± 2 851 467.46^a
	碳水化合物代谢 Carbohydrate metabolism	7 915 005.25 ± 1 088 978.09^a	7 977 677.58 ± 893 493.00^a	8 182 307.00 ± 66 8193.19^a
	氨基酸代谢 Amino acid metabolism	7 063 478.92 ± 966 823.00^a	7 092 711.17 ± 792 150.10^a	7 279 350.08 ± 586 179.57^a
	能量代谢 Energy metabolism	3 723 520.25 ± 510 073.28^a	3 742 113.67 ± 409 484.99^a	3 833 272.92 ± 303 226.45^a
	辅助因子和维生素代谢 Metabolism of cofactors and vitamins	3 596 104.96 ± 488 259.88^a	3 580 709.88 ± 393 862.62^a	3 674 852.42 ± 301 407.93^a
真菌 Fungal	未定义的腐生菌 Undefined saprotroph	11 919.33 ± 1 237.78^a	9 633.50 ± 2 636.32^a	18 537.33 ± 10 095.58^a
	动物病原体-内生菌-植物病原体-未定义腐生菌 Animal pathogen-endophyte-plant pathogen- undefined saprotroph	10 675.17 ± 1 585.46^ab	12 060.50 ± 1 946.59^a	7 946.33 ± 3 433.26^b
	动物病原体-粪便腐生菌-内生菌-附生植物- 植物腐生菌-木材腐生菌 Animal pathogen-dungsaprotroph-endophyte- epiphytelant saprotroph-wood saprotroph	7 631.33 ± 1 345.52^a	9 334.50 ± 2 107.57^a	6 545.83 ± 4 562.01^a
	植物病原体 Plant pathogen	10 021.17 ± 2 090.68^a	5 757.83 ± 1763.85^b	4 860.67 ± 2 198.03^b
	动物病原体-内生菌-地衣寄生虫-植物病原体- 土壤腐生菌-木材腐生菌 Animal pathogen-endophyte-lichen parasite-plant pathogen-soil saprotroph-wood saprotroph	1 255.17 ± 416.48^a	1 119.50 ± 217.63^a	11 740.17 ± 17 952.63^a

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谷子及其根际土壤微生物群落对铬胁迫的响应机制

Response mechanisms of millet and its rhizosphere soil microbial communities to chromium stress

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