生态环境学报 ›› 2021, Vol. 30 ›› Issue (5): 968-975.DOI: 10.16258/j.cnki.1674-5906.2021.05.009
收稿日期:
2020-11-11
出版日期:
2021-05-18
发布日期:
2021-08-06
作者简介:
代金霞,教授,博士,硕士研究生导师,研究方向为微生物资源开发与利用。E-mail:daijx05@163.com
基金资助:
DAI Jinxia(), TIAN Pingya, SHEN Cong, LIU Shuang
Received:
2020-11-11
Online:
2021-05-18
Published:
2021-08-06
摘要:
开展盐渍化土壤中耐盐植物根际促生菌研究,有助于利用根际促生菌改良盐碱土壤。以前期分离自宁夏银北盐碱区耐盐植物根际土壤的110株细菌为材料,测定了菌株解磷、产IAA、产ACC脱氨酶和铁载体等促生特性,通过高活性菌株的交互作用,筛选出11个互不拮抗的菌株进行了菌种鉴定和复合菌群的构建,并验证了高效菌群C3和C8对植物幼苗的促生效果。结果表明:不同菌株的促生能力差别较大,其中23株细菌能够溶解无机磷,解磷量在2.90—70.92 mg∙L-1之间;6株能够产生ACC脱氨酶,酶活性最高为1.56 μmol∙mg-1∙h-1;46株菌具有产IAA的能力,IAA产量在1.33—34.74 mg∙L-1之间;24株菌能够产生铁载体。筛选出的11个高活性菌株分别隶属于芽孢杆菌属、假单胞菌属和鞘氨醇杆菌属,每4个菌株为组合共构建出9组复合菌群,其中C8组合ACC脱氨酶活性最高,达到3.67 μmol∙mg-1∙h-1;其次是C3组合,为2.77 μmol∙mg-1∙h-1;产生的IAA和解磷量分别在4.62—13.30 mg∙L-1和3.52—56.96 mg∙L-1之间,均为C3组合最高;产铁载体能力表现为C1—C4组合较强。盆栽实验表明,接种复合菌群C3和C8能明显促进苜蓿和柳枝稷幼苗生物量的增长。C3的促生效果尤为显著,与对照相比,使苜蓿和柳枝稷幼苗的株高分别增长54.93%和50.96%,地上鲜质量/干质量分别增加113.8%/119.6%和124.6%/82.08%,具备开发为微生物菌剂的潜能。
中图分类号:
代金霞, 田平雅, 沈聪, 刘爽. 耐盐植物根际促生菌筛选及促生效应研究[J]. 生态环境学报, 2021, 30(5): 968-975.
DAI Jinxia, TIAN Pingya, SHEN Cong, LIU Shuang. Screening of Rhizosphere Bacteria from Salt Tolerant Plants and Their Growth Promoting Effects[J]. Ecology and Environment, 2021, 30(5): 968-975.
菌株 Strain | A/Ar | 产铁能力Siderophores | 菌株 Strain | A/Ar | 产铁能力 Siderophores | 菌株 Strain | A/Ar | 产铁能力 Siderophores |
---|---|---|---|---|---|---|---|---|
GQ4 | 0.333±0.011 | ++++ | JJC11 | 0.234±0.002 | ++++ | MX18 | 0.152±0.002 | +++++ |
GQ7 | 0.255±0.016 | ++++ | KDZ6 | 0.271±0.008 | ++++ | MX22 | 0.180±0.005 | +++++ |
GQ9 | 0.242±0.023 | ++++ | KDZ10 | 0.277±0.005 | ++++ | MX23 | 0.480±0.066 | +++ |
GQ12 | 0.440±0.031 | +++ | KDZ12 | 0.156±0.011 | +++++ | MX26 | 0.328±0.009 | ++++ |
GQ13 | 0.338±0.019 | ++++ | CL11 | 0.309±0.055 | ++++ | MX30 | 0.280±0.056 | ++++ |
LZJ13 | 0.190±0.011 | +++++ | MX2 | 0.735±0.027 | ++ | MX31 | 0.228±0.009 | ++++ |
LZJ20 | 0.818±0.025 | + | MX4 | 0.573±0.063 | +++ | MX32 | 0.283±0.026 | ++++ |
JJC9 | 0.256±0.010 | ++++ | MX14 | 0.469±0.005 | +++ | MX16 | 0.346±0.002 | ++++ |
表1 菌株产铁载体能力
Table 1 Ability of siderophores secretion of tested strains
菌株 Strain | A/Ar | 产铁能力Siderophores | 菌株 Strain | A/Ar | 产铁能力 Siderophores | 菌株 Strain | A/Ar | 产铁能力 Siderophores |
---|---|---|---|---|---|---|---|---|
GQ4 | 0.333±0.011 | ++++ | JJC11 | 0.234±0.002 | ++++ | MX18 | 0.152±0.002 | +++++ |
GQ7 | 0.255±0.016 | ++++ | KDZ6 | 0.271±0.008 | ++++ | MX22 | 0.180±0.005 | +++++ |
GQ9 | 0.242±0.023 | ++++ | KDZ10 | 0.277±0.005 | ++++ | MX23 | 0.480±0.066 | +++ |
GQ12 | 0.440±0.031 | +++ | KDZ12 | 0.156±0.011 | +++++ | MX26 | 0.328±0.009 | ++++ |
GQ13 | 0.338±0.019 | ++++ | CL11 | 0.309±0.055 | ++++ | MX30 | 0.280±0.056 | ++++ |
LZJ13 | 0.190±0.011 | +++++ | MX2 | 0.735±0.027 | ++ | MX31 | 0.228±0.009 | ++++ |
LZJ20 | 0.818±0.025 | + | MX4 | 0.573±0.063 | +++ | MX32 | 0.283±0.026 | ++++ |
JJC9 | 0.256±0.010 | ++++ | MX14 | 0.469±0.005 | +++ | MX16 | 0.346±0.002 | ++++ |
菌株(序列号) Strain (accession No.) | 参比菌株(相似性/%) Reference strain (Similarity/%) | 革兰氏染色 Gram staining | 硝酸盐还原 Nitrate reduction | 淀粉水解 Starch hydrolysis | V.P反应 V.P reaction | H2O2酶 H2O2 enzyme |
---|---|---|---|---|---|---|
MX26 (MG735408) | B. subtilis (99%) | + | + | + | + | + |
MX31 (MG735410) | P. brassicacearum (98%) | - | - | - | - | + |
MX32 (MG735411) | S. kitahiroshimense (98%) | - | + | - | - | + |
GQ2 (MG735393) | P. brassicacearum (99%) | - | - | - | - | + |
GQ4 (MG735367) | B. atrophaeus (99%) | + | + | + | + | + |
GQ11 (MG735392) | P. brassicacearum (99%) | - | - | - | - | + |
GQ13 (MG735363) | B. atrophaeus (99%) | + | + | + | + | + |
KDZ12 (MG735374) | B. cereus (99%) | + | + | - | + | + |
JJC11 (MG735369) | B. subtilis (99%) | + | + | + | + | + |
LZJ3 (MG735396) | P. brassicacearum (99%) | - | - | - | - | + |
LZJ12 (MG735380) | B. subtilis (100%) | + | + | + | + | + |
表2 菌株的16S rDNA序列相似性和部分生理生化特征
Table 2 16S rDNA sequence similarity and partial physiological and biochemical characteristics of strains
菌株(序列号) Strain (accession No.) | 参比菌株(相似性/%) Reference strain (Similarity/%) | 革兰氏染色 Gram staining | 硝酸盐还原 Nitrate reduction | 淀粉水解 Starch hydrolysis | V.P反应 V.P reaction | H2O2酶 H2O2 enzyme |
---|---|---|---|---|---|---|
MX26 (MG735408) | B. subtilis (99%) | + | + | + | + | + |
MX31 (MG735410) | P. brassicacearum (98%) | - | - | - | - | + |
MX32 (MG735411) | S. kitahiroshimense (98%) | - | + | - | - | + |
GQ2 (MG735393) | P. brassicacearum (99%) | - | - | - | - | + |
GQ4 (MG735367) | B. atrophaeus (99%) | + | + | + | + | + |
GQ11 (MG735392) | P. brassicacearum (99%) | - | - | - | - | + |
GQ13 (MG735363) | B. atrophaeus (99%) | + | + | + | + | + |
KDZ12 (MG735374) | B. cereus (99%) | + | + | - | + | + |
JJC11 (MG735369) | B. subtilis (99%) | + | + | + | + | + |
LZJ3 (MG735396) | P. brassicacearum (99%) | - | - | - | - | + |
LZJ12 (MG735380) | B. subtilis (100%) | + | + | + | + | + |
组合编号 Combination number | ACC脱氨酶活性 ACC deaminase/(μmol∙mg-1∙h-1) | IAA量 IAA production/(mg∙L-1) | 有效磷含量 Vailable phosphorus/(mg∙L-1) | 产铁载体 Siderophores |
---|---|---|---|---|
C1: MX26, MX31, MX32, GQ11 | 1.43±0.182c | 12.26±0.205b | 41.97±4.882b | +++++ |
C2: MX26, MX31, GQ4, GQ11 | 0.84±0.025d | 12.03±0.194b | 47.54±5.208b | +++++ |
C3: MX26, MX31, MX32, LZJ3 | 2.77±0.001b | 13.30±0.472a | 56.96±3.255a | +++++ |
C4: MX26, MX31, GQ4, LZJ3 | 0.25±0.058e | 12.62±0.302b | 3.52±0.295e | +++++ |
C5: MX26, KDZ12, LZJ3, JJC11 | 0.13±0.025e | 4.62±0.370e | 24.77±1.174c | ++++ |
C6: GQ2, LZJ3, KDZ12, GQ13 | 0.36±0.034e | 5.93±0.103d | 13.51±1.979d | +++ |
C7: GQ2, LZJ3, KDZ12, JJC11 | 0.12±0.007e | 5.25±0.326d | 14.34±0.143d | ++++ |
C8: MX26, KDZ12, LZJ3, LZJ12 | 3.67±0.303a | 8.07±0.063c | 54.12±2.529a | ++++ |
C9: GQ2, LZJ3, KDZ12, LZJ12 | 0.24±0.011e | 8.61±0.213c | 13.58±0.449d | ++++ |
表3 复合菌群的促生能力
Table 3 Ability of the growth-promoting of compound bacteria
组合编号 Combination number | ACC脱氨酶活性 ACC deaminase/(μmol∙mg-1∙h-1) | IAA量 IAA production/(mg∙L-1) | 有效磷含量 Vailable phosphorus/(mg∙L-1) | 产铁载体 Siderophores |
---|---|---|---|---|
C1: MX26, MX31, MX32, GQ11 | 1.43±0.182c | 12.26±0.205b | 41.97±4.882b | +++++ |
C2: MX26, MX31, GQ4, GQ11 | 0.84±0.025d | 12.03±0.194b | 47.54±5.208b | +++++ |
C3: MX26, MX31, MX32, LZJ3 | 2.77±0.001b | 13.30±0.472a | 56.96±3.255a | +++++ |
C4: MX26, MX31, GQ4, LZJ3 | 0.25±0.058e | 12.62±0.302b | 3.52±0.295e | +++++ |
C5: MX26, KDZ12, LZJ3, JJC11 | 0.13±0.025e | 4.62±0.370e | 24.77±1.174c | ++++ |
C6: GQ2, LZJ3, KDZ12, GQ13 | 0.36±0.034e | 5.93±0.103d | 13.51±1.979d | +++ |
C7: GQ2, LZJ3, KDZ12, JJC11 | 0.12±0.007e | 5.25±0.326d | 14.34±0.143d | ++++ |
C8: MX26, KDZ12, LZJ3, LZJ12 | 3.67±0.303a | 8.07±0.063c | 54.12±2.529a | ++++ |
C9: GQ2, LZJ3, KDZ12, LZJ12 | 0.24±0.011e | 8.61±0.213c | 13.58±0.449d | ++++ |
指标 Item | CK | C3 | C8 | |||
---|---|---|---|---|---|---|
测定值 Measured value | 增长率 Growth rate/% | 测定值 Measured value | 增长率 Growth rate/% | |||
株高 Plant height/cm | 8.68±0.548c | 13.45±2.262a | 54.93 | 10.73±0.519b | 23.61 | |
根长 Root length/cm | 12.96±0.896a | 13.38±1.898a | 3.27 | 14.93±1.461a | 15.20 | |
地上鲜质量Fresh mass on the ground/g | 0.150±0.025c | 0.320±0.071a | 113.80 | 0.245±0.052b | 63.69 | |
地下鲜质量 Fresh mass underground/g | 0.044±0.007c | 0.073±0.019a | 66.09 | 0.055±0.013b | 24.79 | |
地上鲜质量 Dry mass on the ground/g | 0.037±0.007c | 0.081±0.019a | 119.60 | 0.062±0.012b | 67.57 | |
地下鲜质量 Dry mass underground/g | 0.022±0.005c | 0.033±0.008a | 49.92 | 0.027±0.006ab | 24.13 |
表4 复合菌群对苜蓿幼苗生物量的影响
Table 4 The effect of compound bacteria on the biomass of Medicago sativa seedlings
指标 Item | CK | C3 | C8 | |||
---|---|---|---|---|---|---|
测定值 Measured value | 增长率 Growth rate/% | 测定值 Measured value | 增长率 Growth rate/% | |||
株高 Plant height/cm | 8.68±0.548c | 13.45±2.262a | 54.93 | 10.73±0.519b | 23.61 | |
根长 Root length/cm | 12.96±0.896a | 13.38±1.898a | 3.27 | 14.93±1.461a | 15.20 | |
地上鲜质量Fresh mass on the ground/g | 0.150±0.025c | 0.320±0.071a | 113.80 | 0.245±0.052b | 63.69 | |
地下鲜质量 Fresh mass underground/g | 0.044±0.007c | 0.073±0.019a | 66.09 | 0.055±0.013b | 24.79 | |
地上鲜质量 Dry mass on the ground/g | 0.037±0.007c | 0.081±0.019a | 119.60 | 0.062±0.012b | 67.57 | |
地下鲜质量 Dry mass underground/g | 0.022±0.005c | 0.033±0.008a | 49.92 | 0.027±0.006ab | 24.13 |
指标 Item | CK | C3 | C8 | |||
---|---|---|---|---|---|---|
测定值 Measured value | 增长率 Growth rate/% | 测定值 Measured value | 增长率 Growth rate/% | |||
株高 Plant height/cm | 11.99±0.116c | 18.10±0.632a | 50.96 | 15.71±0.239b | 31.03 | |
根长 Root length/cm | 16.55±0.719b | 17.96±0.328a | 8.52 | 17.49±0.208a | 5.68 | |
地上鲜质量 Fresh mass on the ground/g | 0.044±0.006b | 0.099±0.011a | 124.60 | 0.092±0.016a | 109.10 | |
地下鲜质量 Fresh mass underground/g | 0.048±0.010c | 0.074±0.009b | 54.86 | 0.083±0.012a | 73.89 | |
地上鲜质量 Dry mass on the ground/g | 0.018±0.001b | 0.032±0.002a | 82.08 | 0.031±0.003a | 76.67 | |
地下鲜质量 Dry mass underground/g | 0.021±0.004b | 0.027±0.004a | 31.59 | 0.032±0.003a | 58.30 |
表5 复合菌群对柳枝稷幼苗生物量的影响
Table 5 The effect of compound bacteria on the biomass of Panicum virgatum seedlings
指标 Item | CK | C3 | C8 | |||
---|---|---|---|---|---|---|
测定值 Measured value | 增长率 Growth rate/% | 测定值 Measured value | 增长率 Growth rate/% | |||
株高 Plant height/cm | 11.99±0.116c | 18.10±0.632a | 50.96 | 15.71±0.239b | 31.03 | |
根长 Root length/cm | 16.55±0.719b | 17.96±0.328a | 8.52 | 17.49±0.208a | 5.68 | |
地上鲜质量 Fresh mass on the ground/g | 0.044±0.006b | 0.099±0.011a | 124.60 | 0.092±0.016a | 109.10 | |
地下鲜质量 Fresh mass underground/g | 0.048±0.010c | 0.074±0.009b | 54.86 | 0.083±0.012a | 73.89 | |
地上鲜质量 Dry mass on the ground/g | 0.018±0.001b | 0.032±0.002a | 82.08 | 0.031±0.003a | 76.67 | |
地下鲜质量 Dry mass underground/g | 0.021±0.004b | 0.027±0.004a | 31.59 | 0.032±0.003a | 58.30 |
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