Role of arbuscular mycorrhizal fungi in cadmium tolerance in rice (Oryza sativa L): a meta-analysis

Ximei Li, Ruiyong Jing, Liyan Wang, Nan Wu, Zhenhua Guo
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引用次数: 8

Abstract

Rice is an important agricultural product consumed globally. Rice polluted by cadmium (Cd) poses serious health risks. Numerous studies have shown that arbuscular mycorrhizal fungi (AMF) decrease Cd concentrations in the grain, shoots, and roots of rice. However, one study showed that AMF increased the root Cd concentration in rice. Therefore, a meta-analysis of the contribution of AMF to rice Cd tolerance became necessary. This meta-analysis was conducted to analyze the role of AMF in Cd tolerance in rice by searching the following databases: ProQuest, PubMed, Scopus, and ScienceDirect. A total of 571 studies were found, of which nine studies and 25 datasets were used in the meta-analysis. The period of inclusion of research reports was from January 1992 to April 2022. The results showed that with the addition of Rhizophagus irregularis, Cd concentration in the roots was higher than in the control group, although the overall Cd concentration in the plant was reduced. Four species of AMF reduced Cd concentration in rice shoots and grain tissues. These AMF species increased the biomass of rice root and shoot tissues; however, they did not affect grain biomass. AMF decreased the transfer factor (TF), and the TF of Glomus versiforme (12.99%) was significantly lower than the other three AMF types. We proposed that Cd could be enriched in rice roots, and the transfer of Cd to the grain could be inhibited. At the time of grain harvesting, rice roots are removed from the soil, thus removing Cd from the soil. This operation can efficiently improve both land-bearing capacity and soil without affecting rice yield. Thus, Cd was enriched in rice roots, and the poten-tial for Cd transfer to the grain was inhibited due to the decreased TF. The future research must focus on how R. irregularis could improve the HMA3 gene expression in rice root, and prevents the transportation of Cd from the roots to shoots.
丛枝菌根真菌在水稻(Oryza sativa L)耐镉性中的作用:meta分析
水稻是全球消费的重要农产品。受镉污染的水稻存在严重的健康风险。大量研究表明,丛枝菌根真菌(AMF)可降低水稻籽粒、芽和根中的镉浓度。然而,一项研究表明,AMF增加了水稻根系Cd浓度。因此,有必要对AMF对水稻Cd耐受性的贡献进行荟萃分析。本荟萃分析通过检索以下数据库:ProQuest、PubMed、Scopus和ScienceDirect,分析AMF在水稻耐Cd性中的作用。共发现571项研究,其中9项研究和25个数据集用于meta分析。纳入研究报告的时间为1992年1月至2022年4月。结果表明,添加不规则食根菌后,虽然植株整体Cd浓度降低,但根系Cd浓度高于对照组。4种AMF降低了水稻茎部和籽粒组织中Cd的浓度。这些AMF物种增加了水稻根和茎组织的生物量;但对籽粒生物量影响不大。AMF降低了转移因子(TF),其中变种Glomus versiforme的TF(12.99%)显著低于其他3种AMF。我们认为Cd可以在水稻根系中富集,并且可以抑制Cd向籽粒的转移。在收获谷物的时候,水稻的根被从土壤中移除,从而从土壤中去除镉。在不影响水稻产量的情况下,有效地提高了土地承载能力和土壤。因此,Cd在水稻根系中富集,并且由于TF的减少,Cd向籽粒转移的潜力受到抑制。今后的研究重点应集中在如何提高水稻根中HMA3基因的表达,并阻止Cd从根向茎部的转运。
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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