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Arbuscular mycorrhiza augments cadmium tolerance in soybean by altering accumulation and partitioning of nutrient elements, and related gene expression

文献类型： 外文期刊

作者： Cui, Guangjuan 1 ; Ai, Shaoying 2 ; Chen, Kang 1 ; Wang, Xiurong 1 ;

作者机构： 1.South China Agr Univ, Root Biol Ctr, State Key Lab Conservat & Utilizat Subtrop Agrobi, Guangzhou 510642, Guangdong, Peoples R China

2.Guangdong Acad Agr Sci, Inst Agr Resources & Environm, Guangzhou 510640, Guangdong, Peoples R China

关键词： Glycine max; Cd; Rhizophagus irregularis; Essential nutrient elements; Translocation and distribution; Molecular mechanism

期刊名称：ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY （ 影响因子：6.291； 五年影响因子：6.393 ）

ISSN： 0147-6513

年卷期： 2019 年 171 卷

页码：

收录情况： SCI

摘要： Arbuscular mycorrhizal (AM) fungi can protect plants against cadmium (Cd) stress, and are the most prominent symbiotic fungi for contribution to phytoremediation. However, the tolerance mechanism for AM symbiosis on Cd toxicity still remains unclear, especially the related molecular mechanisms. In this study, different Cd treatments were applied to two soybean genotypes with different Cd tolerance in the presence or absence of AM fungal inoculation. The results showed that Cd addition obviously decreased AM colonization. AM symbiosis significantly increased plant dry weight, root growth, and P acquisition in Cd-tolerant HX3 genotype at Cd addition treatments. The effectiveness was associated with a concomitant increased expression of the AM inducible phosphate (Pi) transporter genes GmPT8, GmPT9, GmPT10, and upregulated expression of P-type heavy metal ATPase gene GmHMA19. Additionally, AM fungal inoculation effectively impacted the partitioning of Mg, Cu and Zn, including increased Mg, and decreased Cu and Zn relative concentrations in shoots of Cd tolerant HX3. Taken together, these results suggest that AM symbiosis can alleviate Cd toxicity in soybean through enhanced P nutrition, up-regulated expression of AM inducible GmPTs and GmHMA19, as well as, the alteration of the partitioning of essential nutrient elements.

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