The distribution of aerobic bacteria in Chinese cropland is linked to the soil texture

作者：Xiao Jiamin, Haonan Wu, Chao Xu, Yajun Hu, Zhiwen Xu, Zhang Dongxu, Li Abo, Wei Xiao-Meng, Ge Tida, Wei Gehong · 发表于：Frontiers in Microbiology · 年份：2025 · DOI：10.3389/fmicb.2025.1541460 · 被引用次数：2 · 研究领域：Soil Carbon and Nitrogen Dynamics、Microbial Community Ecology and Physiology、Legume Nitrogen Fixing Symbiosis

Aerobic bacteria extensively drive the carbon cycle in soil owing to their vigorous respiration; however, their geographical distribution and mechanisms remain poorly understood. The citric acid synthetase-encoding gene ( gltA ), which encodes the key enzyme in the tricarboxylic acid cycle of aerobic respiration, was used as a marker gene to investigate the geographical distribution of aerobic bacteria in Chinese agricultural fields. The abundance and diversity of gltA -harboring bacteria changed unimodally as the latitude increased, with peak values at middle latitudes, where the dominant species showed the lowest relative abundance. Despite the different water management practices, our data found little difference in the abundance, diversity, or relative abundance of the dominant species of gltA -harboring bacteria between paddy and upland soils on a large scale, which was significantly affected by the soil type (black, fluvo-aquic, and red), which can be defined by the soil texture. Linear regression and random forest model analyses indicated that soil texture strongly regulated the community of gltA -harboring bacteria, particularly the abundance of this functional guild. Generally, less abundant and diverse gltA -harboring bacteria were observed in soils with higher clay content. We identified biomarkers in the different soil types using linear discriminant analysis effect size analysis. The results suggest a significant correlation between soil texture and most of these...