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Bacteria Sphingobium yanoikuyae Sy310 enhances accumulation capacity and tolerance of cadmium in Salix matsudana Koidz roots.
Environmental Science and Pollution Research ( IF 5.8 ) Pub Date : 2020-03-28 , DOI: 10.1007/s11356-020-08474-0
Xiaoyi Zeng 1 , Lu Pang 1 , Yunru Chen 1 , Xiangshi Kong 1 , Junxiu Chen 2 , Xingjun Tian 1
Affiliation  

Abstract

Phytoremediation assisted by plant growth-promoting bacteria (PGPB) is considered an effective strategy for cadmium (Cd) removal in contaminated sites. This study uses a hydroponic experiment to investigate how Sphingobium yanoikuyae Sy310 affects Cd accumulation capacity and tolerance of Salix matsudana Koidz (S. matsudana) roots. The results showed that Cd induced growth change and physiological response on S. matsudana roots, displaying with reduced root length, increased antioxidant enzyme activities, and most importantly, enhanced cell wall polysaccharide contents. The Sy310 inoculation enhanced Cd accumulation in roots and alleviated the Cd toxic effects by regulating root growth, antioxidant enzyme system, and cell wall polysaccharide remodeling. Under Cd stress, Sy310 significantly induced increased root length and biomass, as well as higher root IAA level and Cd retention in cell walls. The Sy310 inoculation enhanced root pectin and hemicellulose 1 content, and pectin methylesterase activity, indicating that more amount of -COOH and -OH in cell walls for binding Cd. With Sy310-regulated extensive Cd regional sequestration in root cell walls and enhanced catalase activity, the root H2O2 and malondialdehyde content decreased, which contributes to improve Cd tolerance of S. matsudana roots. Furthermore, the Sy310 inoculation did not affect root cell wall structure and oxidative stress in the absence of Cd, representing a well-symbiotic relationship between Sy310 and S. matsudana. Therefore, Sy310 plays an important role in expediting the phytoremediation process of Cd with S. matsudana and has practical application potential.



中文翻译:

细菌Sphingobium yanoikuyae Sy310增强了松柳(Salix matsudana Koidz)根中镉的积累能力和耐受性。

摘要

植物促进细菌(PGPB)辅助的植物修复被认为是在受污染场所去除镉(Cd)的有效策略。本研究利用水培试验研究了鞘脂鞘氨醇单胞菌Sy 310如何影响S. matsudana)根的Cd积累能力和耐性。结果表明,Cd诱导松材线虫根的生长变化和生理响应,根长减小,抗氧化酶活性增强,最重要的是细胞壁多糖含量增加。该SY310接种可通过调节根生长,抗氧化酶系统和细胞壁多糖重塑来增强根中Cd的积累并减轻Cd的毒性作用。在镉胁迫下,Sy 310显着诱导了根长和生物量的增加,以及更高的根IAA水平和镉在细胞壁中的保留。的SY 310接种增强的根果胶和半纤维素1含量和果胶甲酯酶活性,这表明结合镉-COOH和-OH的在细胞壁更多量。通过Sy 310调节的根细胞壁中广泛的Cd区域螯合和增强的过氧化氢酶活性,根H 2 O 2和丙二醛含量降低,从而有助于提高Cd的耐镉性。S. matsudana的根。此外,在没有Cd的情况下,接种Sy 310不会影响根细胞壁结构和氧化应激,这代表Sy 310和松散假单胞菌之间具有良好的共生关系。因此,SY 310起着加速镉与植物修复过程中起重要作用:绦柳,具有实际应用的潜力。

更新日期:2020-03-28
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