Characteristics of bacterial communities in rhizosphere and bulk soil in Fe-deficient citrus growing in coastal saline-alkali land

作者：Tianchi Jiang, Jiuzhou Chen, Yu Huang, Xiaoyan Chang, WU Yu-ping, Gaoping Liu, Runze Wang, Kuan Xu, Lingli Lu, Haizhong Lin, Shengke Tian · 发表于：Frontiers in Plant Science · 年份：2024 · DOI：10.3389/fpls.2023.1335843 · 被引用次数：21 · 研究领域：Plant Micronutrient Interactions and Effects、Soil Carbon and Nitrogen Dynamics、Plant Stress Responses and Tolerance

Aims Citruses often occur with imbalance in iron nutrition in coastal saline-alkali lands, which severely limits the yield and quality of the fruit. In the rhizosphere, the salt content plays a crucial role in reducing uptake of iron, as well as the activity and abundance of bacteria. However, few studies have explored how salt content affects the effectiveness of iron and the community structure of bacteria across different vertical spatial scales. Methods We investigated the citrus rhizosphere (0–30 cm) and bulk (0–60 cm) soil microenvironments of the coastal saline soil were analyzed using the 16S rRNA amplicon and inductively coupled plasma-optical emission spectroscopy. Results We found that the nutrient-related elements in the rhizosphere and bulk soil decreased with increasing soil depth, while the salinity-related elements showed the opposite trend. The nutrient-related element content in the rhizosphere was higher than that in the bulk, whereas the salinity-alkaline-related element content was lower than that in the bulk. The structure and diversity of bacterial communities are affected by the rhizosphere and soil depth. In the bulk, there are enriched bacteria such as WB1-A12, Nitrospiraceae and Anaerolineae that are tolerant to salt-alkali stress. In the rhizosphere, bacteria that promote plant nutrient absorption and secretion of iron carriers, such as Pseudomonas , Streptomyces , and Duganella , are prominent. Conclusions The soil depth and rhizosphere affect soi...