The responses of root exudates and microbiome in the rhizosphere of main plant and aromatic intercrops to soil Cr stress

IF 7.6 2区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES
Rui Li, Zhenglin Li, Kui Zhang, Cong Zhang, Yue Sun, Jie Zhang, Yi Zheng, Yuncong Yao, Xiaoxiao Qin
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Abstract

Soil chromium (Cr) stress has a well-recognized negative impact on plant growth, and intercropping is a commonly used method to mitigate heavy metal toxicity to main plants. However, the responses of root exudates-microbial and their interactions among soil zones to soil Cr stress are always in need of clarification in intercropping system. In this study, three intercropping patterns (CT, Malus only; TM, Malus×Mentha and TA, Malus×Ageratum) with different soil Cr addition levels (NCR, LCR, HCR) were applied, and the rhizosphere ecological traits in the main plant (FRS) and intercrop (ARS) were investigated. The results indicate that intercropping with either Mentha or Ageratum has a positive effect on main plants response to soil Cr stress, and intercropping with Ageratum showing a more significant effect. Importantly, we found that the rhizosphere of main plant tends to alleviate stress by accumulating organic acids and amino acids, while aromatic plants exhibit a broader accumulation of metabolites. Additionally, we identified five core differential microbial genera. Our findings provide novel insights into intercrop Cr detoxification in the main plant.

Abstract Image

主栽和芳香间作根系分泌物及根际微生物群对土壤铬胁迫的响应
土壤铬胁迫对植物生长的负面影响是众所周知的,间作是减轻重金属对主要植物毒性的常用方法。然而,间作系统中根系分泌物-微生物对土壤铬胁迫的响应及其在土壤带间的相互作用一直是一个需要澄清的问题。在本研究中,三种间作模式(CT,仅苹果;施用不同土壤Cr添加水平(NCR、LCR、HCR)的TM (Malus×Mentha)和TA (Malus×Ageratum),研究主株(FRS)和间作(ARS)根际生态性状。结果表明,薄荷间作和黑心草间作对主要植物对土壤Cr胁迫的响应均有正向影响,黑心草间作的影响更为显著。重要的是,我们发现主植物根际倾向于通过积累有机酸和氨基酸来缓解胁迫,而芳香植物则表现出更广泛的代谢物积累。此外,我们确定了五个核心的差异微生物属。我们的研究结果为研究作物间作对铬的解毒提供了新的见解。
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来源期刊
Environmental Pollution
Environmental Pollution 环境科学-环境科学
CiteScore
16.00
自引率
6.70%
发文量
2082
审稿时长
2.9 months
期刊介绍: Environmental Pollution is an international peer-reviewed journal that publishes high-quality research papers and review articles covering all aspects of environmental pollution and its impacts on ecosystems and human health. Subject areas include, but are not limited to: • Sources and occurrences of pollutants that are clearly defined and measured in environmental compartments, food and food-related items, and human bodies; • Interlinks between contaminant exposure and biological, ecological, and human health effects, including those of climate change; • Contaminants of emerging concerns (including but not limited to antibiotic resistant microorganisms or genes, microplastics/nanoplastics, electronic wastes, light, and noise) and/or their biological, ecological, or human health effects; • Laboratory and field studies on the remediation/mitigation of environmental pollution via new techniques and with clear links to biological, ecological, or human health effects; • Modeling of pollution processes, patterns, or trends that is of clear environmental and/or human health interest; • New techniques that measure and examine environmental occurrences, transport, behavior, and effects of pollutants within the environment or the laboratory, provided that they can be clearly used to address problems within regional or global environmental compartments.
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