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Endophytic consortium exhibits varying effects in mitigating cadmium toxicity in rice cultivars with distinct cadmium accumulation capacities

文献类型： 外文期刊

作者： Xiang, Jiyun 1 ; Li, Ni 2 ; Feng, Jiaxuan 1 ; Yin, JinYang 1 ; Wang, Yanli 1 ; Wang, Huan 1 ; Wang, Weiping 2 ; Yang, Zhiwei 1 ;

作者机构： 1.Capital Normal Univ, Coll Life Sci, Beijing, Peoples R China

2.Hunan Hybrid Rice Res Ctr, State Key Lab Hybrid Rice, Changsha, Peoples R China

关键词： Cadmium contamination; Rice; Endophytic bacteria; Plant growth promoting bacteria; Community structure

期刊名称：ENVIRONMENTAL TECHNOLOGY & INNOVATION （ 影响因子：7.1； 五年影响因子：7.1 ）

ISSN： 2352-1864

年卷期： 2024 年 36 卷

页码：

收录情况： SCI

摘要： Cadmium (Cd)-contaminated rice is the main source of Cd exposure that threatens food safety and human health. While plant growth-promoting bacteria (PGPB) have been reported to reduce Cd toxicity in rice, the effect of endophytic consortium is less understood compared to the single strain. Here, we reported that the PGPB consortium consisting of Cd-tolerant endophytic bacteria Pseudomonas sp. 4N2 and Bacillus sp. TB1 increased extracellular polymeric substance secretion and demonstrated a higher Cd removal rate compared to individual 4N2 and TB1. Further, two rice cultivar, namely the low-Cd-accumulating (LA) cultivar 728B and the high-Cd-accumulating (HA) cultivar BB, were inoculated with the 4N2-TB1 consortium. As expected, the consortium had a more pronounced effect on 728B, from which the endophytic bacteria were screened. The 4N2TB1 consortium was found to facilitate the growth of rice seedlings and enhance their anti- oxidation activity. Moreover, the consortium significantly reduced Cd transfer coefficient from root to shoot through Cd immobilization in rice roots, resulting in a reduction from 30 % to 6 % in 728B and from 31 % to 13 % in BB. Furthermore, alpha-diversity analysis indicated an increased diversity and richness of the root bacterial community after 4N2-TB1 inoculation. Also, redundancy analysis confirmed a positive correlation between rice biomass and Cd content with a specific assemblage of bacteria including Bacillus and Leifsonia. . These results demonstrated that the 4N2-TB1 consortium may alleviate Cd stress in rice cultivars through recruiting PGPB and Cdbinding bacteria on the root surface, thus strengthening the immobilization of Cd in rice roots.

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