Upadhayay Viabhav Kumar, Gangola Saurabh, Taj Gohar, Gaurav Kumar, Rani Anju, Kumar Sunil, Garg Shivanshu, Gupta Gaurav, Ali Haider, Siddiqui Sazada, Alamri Saad A M, Mittal Amit, Alrumman Sulaiman A, Pandey Mayank
Department of Microbiology, College of Basic Sciences & Humanities, Dr. Rajendra Prasad Central Agricultural University, Pusa, Samastipur, Bihar, India.
Department of Microbiology, Graphic Era Deemed to be University, Dehradun, India.
Front Microbiol. 2025 Jun 25;16:1575514. doi: 10.3389/fmicb.2025.1575514. eCollection 2025.
The term "zinc-solubilizing bacteria" (ZSB) refers to a specific group of soil bacteria that are associated with zinc-solubilizing activity in the soil through a variety of mechanisms. The functional use of ZSB has been proposed for the zinc (Zn) biofortification of crops to address Zn malnutrition. The application of zinc-solubilizing bacterial inoculants that harbor significant plant probiotic traits offers an eco-friendly approach to producing crops with improved Zn content in various edible parts of plants. In soil, ZSB solubilize complex forms of Zn compounds by producing organic acids and employing other mechanisms (such as the secretion of "siderophore," extrusion of "proton," expression of "oxidoreductive systems" on cell membranes, and secretion of "chelated ligands"), making the resulting soluble form of zinc readily accessible to plants. ZSB also act as plant growth stimulators, demonstrating both direct and indirect mechanisms that promote robust plant growth. In recent years, the application of two or more ZSB strains in a consortium has gained attention as a cost-effective alternative for Zn biofortification. This approach may serve as a promising strategy for promoting plant growth and optimizing yield performance. This review discusses various methods of Zn biofortification, highlighting ZSB and their consortia in increasing Zn content in grains and other edible crop parts, as well as the mechanisms involved in Zn solubilization by these bacteria. This insight paves the way for developing eco-friendly strategies that integrate microbial-based solutions to improve crop nutrient bioavailability.
“锌溶解细菌”（ZSB）一词指的是一类特定的土壤细菌，它们通过多种机制在土壤中发挥锌溶解活性。有人提出利用ZSB的功能对作物进行锌（Zn）生物强化，以解决锌营养不良问题。应用具有重要植物益生菌特性的锌溶解细菌接种剂，为在植物的各个可食用部分提高锌含量来生产作物提供了一种生态友好的方法。在土壤中，ZSB通过产生有机酸和采用其他机制（如分泌“铁载体”、“质子”外排、细胞膜上“氧化还原系统”的表达以及“螯合配体”的分泌）来溶解复杂形式的锌化合物，使产生的可溶性锌形式易于被植物吸收。ZSB还作为植物生长刺激剂，展示了促进植物茁壮成长的直接和间接机制。近年来，将两种或更多种ZSB菌株组合应用作为锌生物强化的一种经济有效的替代方法受到了关注。这种方法可能是促进植物生长和优化产量表现的一种有前景的策略。本综述讨论了锌生物强化的各种方法，重点介绍了ZSB及其组合在提高谷物和其他可食用作物部分锌含量方面的作用，以及这些细菌溶解锌的机制。这一见解为制定整合基于微生物的解决方案以提高作物养分生物有效性的生态友好策略铺平了道路。
