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Silicon modification improves biochar?s ability to mitigate cadmium toxicity in tomato by enhancing root colonization of plant-beneficial bacteria

文献类型： 外文期刊

作者： Jin, Xue 1 ; Rahman, Muhammad Khashi u 1 ; Ma, Changli 1 ; Zheng, Xianqing 2 ; Wu, Fengzhi 1 ; Zhou, Xingang 1 ;

作者机构： 1.Northeast Agr Univ, Dept Hort, Key Lab Biol & Genet Improvement Hort Crops Northe, Minist Agr & Rural Affairs, Harbin 150030, Peoples R China

2.Shanghai Acad Agr Sci, Inst Eco Environm & Plant Protect, Shanghai 201403, Peoples R China

3.Changjiang 600, Harbin, Heilongjiang, Peoples R China

关键词： Modified biochar; Silicon; Heavy metal toxicity; Bacterial diversity; Plant-beneficial bacteria

期刊名称：ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY （ 影响因子：6.8； 五年影响因子：6.9 ）

ISSN： 0147-6513

年卷期： 2023 年 249 卷

页码：

收录情况： SCI

摘要： Modification of biochar, such as impregnation with minerals, can improve biochar's efficacy to mitigate heavy metal toxicity in plants. Biochar amendments can alter plant rhizosphere microbiome, which has profound ef-fects on plant growth and fitness. Here, we tested whether rhizosphere microbiome is involved in the ability of silicon (Si)-modified biochar to mitigate cadmium toxicity in tomato (Solanum lycopersicum L.). We demonstrated that Si modification altered biochar's physico-chemical properties and enhanced its ability to mitigate cadmium toxicity in tomato. Particularly, the Si-modified biochar contained higher content of Si and increased plant-available Si content in the soil. The rhizosphere microbiome transplant experiment showed that changes in rhizosphere microbiome contributed to the mitigation of cadmium toxicity by biochar amendments. The raw biochar and Si-modified biochar differently altered tomato rhizosphere bacterial community composition. Both biochars, especially the Si-modified biochar, promoted specific bacterial taxa (e.g., Sphingomonas, Lysobacter and Pseudomonas spp.). Subsequent culturing found these promoted bacteria could mitigate cadmium toxicity in tomato. Moreover, both biochars stimulated tomato to recruit plant-beneficial bacteria with Si-modified biochar having stronger stimulatory effects, indicating that the positive effects of biochar on plant-beneficial bacteria was partially mediated via the host plant. Overall, Si modification enhanced biochar's ability to mitigate cadmium toxicity, which was linked to the stimulatory effects on plant-beneficial bacteria.

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