-路径通过缓冲树根球酸化减轻重金属应力,从而减轻重金属应力
Zhihao Pang1, Weisong Yin1, Yuxiao Wang2
1Ministry of Education Key Laboratory of Environment Remediation and Ecological Health, College of Environmental & Resource Sciences, Zhejiang University, Hangzhou 310058, China.
The Science of the total environment
|September 8, 2023
概括
的吸收减少了大米根的酸化,降低了重金属的生物可用性. 这种新的机制涉及增加可溶和缓冲土壤pH值,减轻重金属压力并改善植物健康.
科学领域:
- 植物科学 植物科学
- 环境科学 环境科学
- 生物化学 生物化学
背景情况:
- 重金属污染对全球粮食安全构成重大威胁.
- 草圈酸化加剧了重金属的生物可用性,增加了植物的吸收.
- (Si) 是植物有益的元素,已知可以减轻压力,但其在树根球过程中的作用尚未得到研究.
研究的目的:
- 为了研究吸收对大米根球酸化的影响.
- 阐明对根排泄物和分配的影响的潜在机制.
- 通过根球修饰来确定在减轻重金属应力中的作用.
主要方法:
- 对处理和未处理的水品种 (Japonica和Indica) 的比较分析.
- 在根排泄物中的有机酸和总有机碳的量化.
- 定量PCR (q-PCR) 用于评估与质子和有机酸分泌有关的基因表达.
- 分析米苗中的分配情况.
- 营养溶液模拟,以评估重金属的生物可用性和植物吸收在不同的酸化水平下.
主要成果:
- 的吸收显著减少了大米品种的根酸性.
- 根排泄物中总有机碳,酸和酸的度在处理后下降.
- 通过处理,对质子和有机酸分泌的基因表达被降低了35-61%.
- 处理使米苗中的可溶比例从52.0%增加到61.7%,同时减少了细胞壁.
- 减少了树根球的酸化导致溶液中的自由Cr3+减少了43%,这有助于63%的Cr (III) 应力减轻.
结论:
- 通过缓冲树脂层酸化和增加植物可溶度来减轻重金属的吸收.
- 这项研究揭示了对面对重金属压力的植物有益影响的新机制.
- 这些发现为使用肥提高利用效率,减少重金属积累和管理土壤pH提供了理论基础.
相关概念视频
The Phosphorus Cycle
37.5K
Unlike carbon, water, and nitrogen, phosphorus is not present in the atmosphere as a gas. Instead, most phosphorus in the ecosystem exists as compounds, such as phosphate ions (PO43-), found in soil, water, sediment and rocks. Phosphorus is often a limiting nutrient (i.e., in short supply). Consequently, phosphorus is added to most agricultural fertilizers, which can cause environmental problems related to runoff in aquatic ecosystems.
37.5K
Other Stress Responses in Bacteria
33
Bacteria have global regulatory systems that control several types of stress mechanisms. These include Pho regulon and the heat shock response, which are essential systems for environmental adaptation, such as nutrient limitation and proteotoxic stress. The Pho regulon and the heat shock response exemplify bacterial resilience, enabling rapid adaptation to fluctuating environmental conditions.Pho RegulonBacteria require phosphorus for essential cellular processes, including nucleic acid...
33
Metabolism of Chemolithotrophs
40
Chemolithotrophs are microorganisms that obtain energy by oxidizing inorganic molecules such as hydrogen gas (H₂), ammonia (NH₃), reduced sulfur compounds (H₂S, S²⁻), and ferrous iron (Fe²⁺). Unlike heterotrophic organisms that rely on organic carbon, chemolithotrophs transfer electrons from these inorganic donors to the electron transport chain (ETC), generating a proton motive force (PMF) that drives ATP synthesis through oxidative phosphorylation.
40
Sulfur Assimilation
38
Sulfur is an essential element in biological systems, contributing to synthesizing key biomolecules, including amino acids such as cysteine and methionine, and cofactors such as coenzyme A and biotin. Microorganisms primarily assimilate sulfur as sulfate (SO₄²⁻) from the environment, which must undergo a series of biochemical transformations before it can be incorporated into cellular components. As sulfate is highly oxidized, it must undergo assimilatory sulfate reduction to...
38
Responses to Salt Stress
13.2K
Salt stress—which can be triggered by high salt concentrations in a plant’s environment—can significantly affect plant growth and crop production by influencing photosynthesis and the absorption of water and nutrients.
13.2K
Bioremediation
18.9K
Bioremediation is the use of prokaryotes, fungi, or plants to remove pollutants from the environment. This process has been used to remove harmful toxins in groundwater as a byproduct of agricultural run-off and also to clean up oil spills.
18.9K


