NMT历史上的今天丨AGR ECOSYST ENVIRON、Ecotoxicol Environ Saf 文章发表

来源: 旭月(北京)科技有限公司   2019-10-22   访问量:438评论(0)


2018年10月22日,福建农林大学林文雄、林生利用NMT在Agriculture, Ecosystems and Environment上发表了标题为Rhizosphere responses to environmental conditions in Radix pseudostellariae under continuous monoculture regimes的研究成果。

2018年10月22日,华中农业大学孙学成、史凯丽利用NMT在Ecotoxicology and Environmental Safety 上发表了标题为Non-invasive microelectrode cadmium flux measurements reveal the decrease of cadmium uptake by zinc supply in pakchoi root (Brassica chinensis L.)的研究成果。

期刊:Agriculture, Ecosystems and Environment


标题:Rhizosphere responses to environmental conditions in Radix pseudostellariae under continuous monoculture regimes





The root exudates of Radix pseudostellariae, working as a rhizospheric intermediary between plants and microbes, can deteriorate the microbial community in the rhizosphere in a consecutive monoculture system.

We assessed the effects of artificially applied R. pseudostellariae root exudates on R. pseudostellariae seedling growth, rhizo-sphere soil microbial communities, and soil physicochemical properties. We found that phenolic acids and or-ganic acids acted as a driver of changes in the microbial community. High-throughput sequencing and qRT-PCR analysis demonstrated that treatment with phenolic acids significantly decreased the relative abundance of Trichoderma, Penicillium, Pseudomonadales, Xanthomonadales, and Streptomycetales.

Organic acids had a sig-nificant negative effect on the relative abundance of Pseudomonadales and Streptomycetales and significantly increased the abundance of Fusarium, Xanthomonadales, Micrococcales, and Gemmatimonadales. Analysis based on the noninvasive microtest technique indicated that root exudates increased H+ efflux and plasma membrane H+-ATPase activity in the pathogenic fungi and decreased them in the beneficial fungi.

These phenomena created an acidic environment for the inhibition of beneficial bacteria and accumulation of specialized plant pathogens. This study explains the mechanisms underlying the shift in microflora and structural disorder caused by root exudates in continuously monocultured R. pseudostellariae rhizosphere soil through responses to en-vironmental conditions.




有机酸对假单胞菌和链霉菌的相对丰度有明显的负面影响,并显着增加了镰刀菌,黄单胞菌,微球藻和Gemmatimonadales的丰度。基于非侵入性微测试技术的分析表明,根系分泌物增加了病原真菌中的H +流动和质膜H+ -ATPase活性,而减少了其有益真菌中的H+酶和质膜H+ -ATPase活性。


Fig. 7. Effect of Fusarium oxysporum on steady H+ fluxes in R. pseudostellariae roots. CK represents roots without F. oxysporum stimulation;F. oxysporum re-presents roots stimulated with F. oxysporum.

文章链接: https://linkinghub.elsevier.com/retrieve/pii/S0167880918304377

期刊:Ecotoxicology and Environmental Safety


标题:Non-invasive microelectrode cadmium flux measurements reveal the decrease of cadmium uptake by zinc supply in pakchoi root (Brassica chinensis L.)






Zinc (Zn) possesses similar properties to cadmium (Cd) and inhibits Cd uptake in plants. To get more detailed mechanisms of Zn-inhibited Cd uptake in pakchoi, a hydroponic experiment was conducted to investigate the effects of various Zn levels on Cd concentrations, real time flux of Cd, expressions of genes related to Cd uptake under Cd exposure.

The results showed that the Cd concentrations and Cd accumulations in pakchoi root de-creased with increasing Zn levels, which were coincident with that real time Cd influx and net Cd influx of pakchoi root decreased with increasing Zn levels by non-invasive micro-test technology (NMT). Additionally, the expressions of Cd-related transporters including BcNRAMP5, BcIRT1 and BcMGT1 decreased with the increase of Zn levels under Cd exposure, especially BcIRT1 with the highest decreased rates. Furthermore, the expressions of these genes decreased gradually with the prolongation of Zn treated time under Cd toxicity.

The results indicate that Zn inhibits Cd uptake by inhibition of the expressions of Cd-related transporters, especially BcIRT1 in pakchoi root.



结果表明,通过无创微试验技术,小白菜根中的Cd浓度和Cd积累量随Zn水平的升高而降低,这与小菜根的实时Cd输入量和Cd净含量随Zn含量的增加而降低。 (NMT)。另外,随着镉暴露下锌水平的升高,包括BcNRAMP5,BcIRT1和BcMGT1在内的Cd相关转运蛋白的表达下降,尤其是下降率最高的BcIRT1。此外,随着镉对镉的毒害作用时间的延长,这些基因的表达逐渐降低。


Fig. 3. Effects of Zn on net Cd2+ influxes in root of pak-choi by Non-invasive micro-test technology. The 10 d pakchoi seedlings treated with Zn deficiency Hoagland solution were used to analyze the Cd influx. The Zn con-centrations of 0 (Zn 0), 1 (Zn 1), 5 (Zn 5) and 10 μM (Zn 10) represented that the concentrations of Zn were added the basic solution containing 9 μM Cd. (A) The steady-state Cd2+ influx before and after the Zn supply into the basic solution. (B) Mean rates of Cd2+ influx of the time in A. Each point represents the mean of six roots from six in-dividual plants. Data are the means of 6 replicates ± standard error. Different lowercase represents significant differences between treatments (p < 0.05).

文章链接: https://doi.org/10.1016/j.ecoenv.2018.10.081

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