Arbuscular mycorrhizal fungi regulate plant mineral nutrient uptake and partitioning in iron ore tailings undergoing eco-engineered pedogenesis

IF 5.2 2区农林科学 Q1 SOIL SCIENCE

Pedosphere Pub Date : 2024-04-01 DOI:10.1016/j.pedsph.2023.04.004

Zhen LI , Songlin WU , Yunjia LIU , Qing YI , Merinda HALL , Narottam SAHA , Junjian WANG , Yuanfang HUANG , Longbin HUANG

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引用次数: 0

Abstract

Excess available K and Fe in Fe ore tailings with organic matter amendment and water-deficiencies may restrain plant colonization and growth, which hinders the formation of eco-engineered soil from these tailings for sustainable and cost-effective mine site rehabilitation. Arbuscular mycorrhizal (AM) fungi are widely demonstrated to assist plant growth under various unfavorable environments. However, it is still unclear whether AM symbiosis in tailings amended with different types of plant biomass and under different water conditions could overcome the surplus K and Fe stress for plants in Fe ore tailings, and if so, by what mechanisms. Here, host plants (Sorghum sp. Hybrid cv. Silk), either colonized or noncolonized by the AM fungi (Glomus spp.), were cultivated in lucerne hay (LH, C:N ratio of 18)- or sugarcane mulch (SM, C:N ratio of 78)-amended Fe ore tailings under well-watered (55% water-holding capacity (WHC) of tailings) or water-deficient (30% WHC of tailings) conditions. Root mycorrhizal colonization, plant growth, and mineral elemental uptake and partitioning were examined. Results indicated that AM fungal colonization improved plant growth in tailings amended with plant biomass under water-deficient conditions. Arbuscular mycorrhizal fungal colonization enhanced plant mineral element uptake, especially P, both in the LH- and SM-amended tailings regardless of water condition. Additionally, AM symbiosis development restrained the translocation of excess elements (i.e., K and Fe) from plant roots to shoots, thereby relieving their phytotoxicity. The AM fungal roles in P uptake and excess elemental partitioning were greater in LH-amended tailings than in SM-amended tailings. Water deficiency weakened AM fungal colonization and functions in terms of mineral element uptake and partitioning. These findings highlighted the vital role AM fungi played in regulating plant growth and nutrition status in Fe ore tailings technosol, providing an important basis for involvement of AM fungi in the eco-engineered pedogenesis of Fe ore tailings.

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丛枝菌根真菌调节生态工程成土过程中铁矿尾矿中植物对矿物质营养的吸收和分配

铁矿尾矿中过量的可利用钾和铁以及有机物质的添加和缺水可能会抑制植物的定植和生长，从而阻碍利用这些尾矿形成生态工程土壤，以实现可持续和具有成本效益的矿区恢复。大量事实证明，丛枝菌根（AM）真菌可在各种不利环境下帮助植物生长。然而，AM 在不同类型的植物生物量和不同水质条件下与尾矿共生是否能克服铁矿尾矿中植物所面临的过剩钾和铁胁迫，以及如果能克服，是通过什么机制实现的，目前仍不清楚。这里，在水分充足（尾矿持水量为 55%）或缺水（尾矿持水量为 30%）的条件下，在苜蓿干草（LH，C:N 比为 18）或甘蔗地膜（SM，C:N 比为 78）改良的铁矿尾矿中栽培了寄主植物（高粱杂交种，Silk），这些寄主植物有的被 AM 真菌（Glomus 菌属）定殖，有的未被定殖。对根部菌根的定殖、植物生长以及矿物质元素的吸收和分配进行了研究。结果表明，在缺水条件下，AM 真菌的定殖改善了添加了植物生物量的尾矿中植物的生长。丛枝菌根真菌的定殖提高了植物对矿质元素的吸收，尤其是对钾的吸收，在 LH 和 SM 改良过的尾矿中均是如此，与水条件无关。此外，AM共生的发展抑制了过量元素（如钾和铁）从植物根部向嫩枝的转移，从而减轻了它们的植物毒性。在 LH-amended 尾矿中，AM 真菌在 P 吸收和过量元素分配中的作用比在 SM-amended 尾矿中更大。缺水削弱了 AM 真菌的定殖以及在矿物元素吸收和分配方面的功能。这些发现突显了 AM 真菌在铁矿尾矿技术溶胶中调节植物生长和营养状况的重要作用，为 AM 真菌参与铁矿尾矿生态工程化成土过程提供了重要依据。

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来源期刊

Pedosphere 环境科学-土壤科学

CiteScore

11.70

自引率

1.80%

发文量

147

审稿时长

5.0 months

期刊介绍： PEDOSPHERE—a peer-reviewed international journal published bimonthly in English—welcomes submissions from scientists around the world under a broad scope of topics relevant to timely, high quality original research findings, especially up-to-date achievements and advances in the entire field of soil science studies dealing with environmental science, ecology, agriculture, bioscience, geoscience, forestry, etc. It publishes mainly original research articles as well as some reviews, mini reviews, short communications and special issues.