Effects of elevated CO2 concentration on Se accumulation and associated rhizobacterial community in Cardamine hupingshanensis

IF 3.9 2区农林科学 Q1 AGRONOMY Plant and Soil Pub Date : 2024-11-19 DOI:10.1007/s11104-024-07072-0

Huawei Zang, Wenyao Shi, Minyi Kau, Jiayuan Li, Jinxing Li, Wanying Zhang, Zeming Zhou, Bowen Sun, Linxi Yuan, Renbin Zhu

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Abstract

Background and aims

Selenium (Se) deficiency in soil and human diets may worsen with elevated atmospheric carbon dioxide (eCO₂). However, current research focused on essential nutrient elements, such as nitrogen, phosphorus and potassium, the effects of eCO₂ on Se accumulation in staple crops are understudied. Here, the Se-hyperaccumulator Cardamine hupingshanensis was selected to investigate the impacts on Se accumulation, and associated rhizobacterial communities under eCO₂ (800 ppm).

Methods

Simulated CO₂-elevated greenhouse experiments were conducted, and Se concentrations were measured using inductively coupled plasma mass spectrometry (ICP-MS). Bacterial communities in bulk, rhizosphere and rhizoplane soils were analyzed via high-throughput 16 S rRNA amplicon sequencing.

Results

The eCO₂ increased Se levels by three- to four-fold in C. hupingshanensis cultivated in natural soils. Rhizobacterial communities exhibited notable shifts under eCO₂ with increased relative abundances of Bacillaceae, Rhizobiaceae, Flavobacteriaceae and Xanthomonadaceae, but decreased Sphingomonadaceae, Gemmatimonadaceae and Micrococcaceae. Genera such as Nannocystis, Steroidobacter, Dactylosporangium and Brevundimonas, demonstrated significant positive correlation (P < 0.05) with total Se, bioavailable Se and pH in soils. The abundances of the bacteria involved in Se metabolism exhibited significant positive correlations (P < 0.05) with total inorganic carbon (TIC), total organic carbon (TOC) and carbon metabolism. Structural Equation Modelling analysis indicated that eCO₂ significantly increased soil bioavailable Se and C. hupingshanensis Se levels.

Conclusion

The eCO₂ promoted Se accumulation in C. hupingshanensis roots by regulating soil pH, TIC and bioavailable Se levels, while reshaping rhizobacterial communities. This study contributes to understanding associated mechanisms of Se accumulation under eCO₂, particularly in plant-rhizobacterial interactions.

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高浓度二氧化碳对平山红豆杉硒积累及相关根瘤菌群落的影响

背景和目的土壤和人类饮食中硒（Se）的缺乏可能会随着大气二氧化碳（eCO2）的升高而加剧。然而，目前的研究主要集中在氮、磷、钾等必需营养元素上，对二氧化碳对主要作物中硒积累的影响研究不足。在此，我们选择了硒超积累植物胡平山红豆杉（Cardamine hupingshanensis）来研究 eCO2（800 ppm）对硒积累以及相关根瘤菌群落的影响。通过高通量 16 S rRNA 扩增子测序分析了大体积土壤、根瘤菌层和根瘤土壤中的细菌群落。根瘤菌群落在 eCO2 条件下表现出明显的变化，芽孢杆菌科、根瘤菌科、黄杆菌科和黄单胞菌科的相对丰度增加，而鞘氨单胞菌科、宝石单胞菌科和微球菌科的相对丰度降低。Nannocystis、Steroidobacter、Dactylosporangium 和 Brevundimonas 等菌属与土壤中的总硒、生物可利用硒和 pH 值呈显著正相关（P < 0.05）。参与硒代谢的细菌丰度与总无机碳（TIC）、总有机碳（TOC）和碳代谢呈显著正相关（P < 0.05）。结构方程建模分析表明，eCO2 能显著提高土壤生物可利用硒的含量，并能显著提高胡杨根瘤菌的硒含量。这项研究有助于了解 eCO2 条件下硒积累的相关机制，特别是植物与根瘤菌之间的相互作用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Plant and Soil 农林科学-农艺学

CiteScore

8.20

自引率

8.20%

发文量

543

审稿时长

2.5 months

期刊介绍： Plant and Soil publishes original papers and review articles exploring the interface of plant biology and soil sciences, and that enhance our mechanistic understanding of plant-soil interactions. We focus on the interface of plant biology and soil sciences, and seek those manuscripts with a strong mechanistic component which develop and test hypotheses aimed at understanding underlying mechanisms of plant-soil interactions. Manuscripts can include both fundamental and applied aspects of mineral nutrition, plant water relations, symbiotic and pathogenic plant-microbe interactions, root anatomy and morphology, soil biology, ecology, agrochemistry and agrophysics, as long as they are hypothesis-driven and enhance our mechanistic understanding. Articles including a major molecular or modelling component also fall within the scope of the journal. All contributions appear in the English language, with consistent spelling, using either American or British English.