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Impact of rhizosphere microorganisms on arsenic (As) transformation and accumulation in a traditional Chinese medical plant
Environmental Science and Pollution Research ( IF 5.8 ) Pub Date : 2021-06-24 , DOI: 10.1007/s11356-021-14500-6
Jiao-Jiao Li 1 , Long Yang 1 , Cui-Ping Miao 2 , Ya-Jun Teng 3 , Zi-Hao Fu 1 , Chang-Lei Cheng 4 , Xue-Xiu Chang 1 , Yu Qian 1 , Li-Xing Zhao 2, 5
Affiliation  

Panax notoginseng is an important traditional medicinal plant, but the commercial value is threatened by root-rot disease caused by rhizosphere microbes and a potential health risk caused by plant arsenic (As) accumulation. Whether rhizospheric microbes isolated from P. notoginseng rhizosphere soil could impact As uptake and transport into P. notoginseng is not yet known. Among the three root-rot disease-causing pathogens Fusarium flocciferum (PG 1), Fusarium oxysporum (PG 2), and Fusarium solani (PG 3) and one root-rot disease biocontrol fungus Trichoderma koningiopsis (FC 1) and five biocontrol-exerting bacterial species Bacillus siamensis (BC 1), Delftia acidovorans (BC 2), Brevibacillus formosus (BC 3), Mortierella alpine (BC 4), and Bacillus subtilis (BC 5), one As-resistant pathogen and four biocontrol microorganisms with As-resistant ability were identified. The As-transforming ability of the identified fungi and bacteria was ranked in the order of FC 1 > PG 1 and BC 2 > BC 3 > BC 1, respectively. Then, the As-resistant biocontrol and pathogenic microbes were initiated to colonize the rhizosphere of 1-year-old P. notoginseng seedlings growing in artificially As(V)-contaminated soil to evaluate the impact of microbe inoculation on P. notoginseng As uptake and transport capacity. Concentration of As in P. notoginseng tissues decreased in the order of the sequence stem > root > leaf. Compared to treatment without colonization by microorganism, inoculation with microorganisms increased As root uptake efficiency and root As concentration, especially under treatment of inoculation by BC 2 and PG 1 + BC 2. As transport efficiency from root to stem decreased by inoculation with microorganism, especially under treatment with inoculation of BC 2 and PG 1 + BC 2. However, the impact of microorganism colonization on As stem to leaf transport efficiency was not obvious. In summary, inoculation with rhizosphere microbes may increase As accumulation in P. notoginseng root, especially when using bacteria with high As transformation ability. Therefore, it is necessary to evaluate the As transformation capacity before applying biological control microorganism to the rhizosphere of P. notoginseng.



中文翻译:

根际微生物对中药植物砷 (As) 转化积累的影响

三七是一种重要的传统药用植物,但其商业价值受到根际微生物引起的根腐病和植物砷 (As) 积累引起的潜在健康风险的威胁。从P. notoginseng根际土壤中分离出的根际微生物是否会影响 As 对P 的吸收和转运。三七还不知道。在三种根腐病致病病原体Fusarium flocciferum (PG 1)、Fusarium oxysporum (PG 2) 和Fusarium solani (PG 3) 和一种根腐病生防真菌Trichoderma koningiopsis (FC 1) 和五种生防植物中细菌种类Bacillus siamensis (BC 1), Delftia acidovorans (BC 2), Brevibacillus formosus (BC 3), Mortierella alpine (BC 4), and Bacillus subtilis (BC 5), 一种耐砷病原体和四种具有耐砷能力的生防微生物被确定。鉴定出的真菌和细菌转化砷能力的顺序分别为FC 1 > PG 1 和BC 2 > BC 3 > BC 1 。然后,启动抗砷生防和病原微生物在 1 年生P的根际定殖。在人工 As(V) 污染的土壤中生长的三七幼苗评估微生物接种对P的影响。三七具有摄取和转运能力。三七组织中As浓度按茎>根>叶的顺序降低。与未被微生物定植的处理相比,接种微生物提高了 As 根吸收效率和根 As 浓度,特别是在 BC 2 和 PG 1 + BC 2 接种处理下。由于接种微生物从根到茎的运输效率降低,特别是在接种BC 2 和PG 1 + BC 2 的处理下。然而,微生物定植对As茎叶转运效率的影响并不明显。总之,接种根际微生物可能会增加磷中砷的积累。三七根,特别是在使用具有高 As 转化能力的细菌时。因此,有必要在将生物控制微生物应用于P的根际之前评估 As 转化能力。三七

更新日期:2021-06-24
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