Akinyemi Muiz O, Tsipinana Sinawo, Alayande Kazeem A, Mokubedi Maphala, Adeleke Rasheed A
Unit for Environmental Sciences and Management, North-West University, Potchefstroom, 2520, South Africa.
Leeds Institute of Health Sciences, University of Leeds, Leeds, UK.
Curr Microbiol. 2025 Aug 3;82(9):430. doi: 10.1007/s00284-025-04404-w.
Soil microbial communities are key drivers of plant health and productivity, influencing nutrient cycling and energy flow. This study investigated the impact of environmental variables on the bacterial communities within the rhizospheres of maize and soybean, two economically important crops, across contrasting South African climates with identical agricultural practices. Using 16S rRNA amplicon sequencing, we conducted a comparative analysis of rhizosphere bacterial communities in the semi-arid steppe of Free State and the subtropical region of Mpumalanga. In the semi-arid steppe, Actinobacteriota (36.5%), Pseudomonadota (24.4%), and Chloroflexi (12.8%) were dominant, while the subtropical region had higher proportions of Actinobacteriota (34.8%), Pseudomonadota (27.6%), and Acidobacteriota (12.6%). Our findings indicate that while a core bacterial community persists across regions, environmental factors significantly influence the diversity of non-core taxa. For instance, in Mpumalanga, correlation analysis suggested that the abundance of families like Burkholderiaceae and Symbiobacteraceae were influenced by moisture and minimum daily temperature while in Free State, families such as WS2 and Legionellaceae were influenced by maximum daily temperature, soil pH, and texture. These findings underscore the influence of climate and soil properties on the rhizosphere microbiome and highlight the importance of understanding these patterns for enhancing crop production in changing environmental conditions.
土壤微生物群落是植物健康和生产力的关键驱动因素，影响着养分循环和能量流动。本研究调查了环境变量对玉米和大豆根际细菌群落的影响，这两种经济作物在南非不同气候条件下采用相同的农业 practices。利用 16S rRNA 扩增子测序，我们对自由州半干旱草原和姆普马兰加亚热带地区的根际细菌群落进行了比较分析。在半干旱草原，放线菌门（36.5%）、假单胞菌门（24.4%）和绿弯菌门（12.8%）占主导地位，而亚热带地区放线菌门（34.8%）、假单胞菌门（27.6%）和酸杆菌门（12.6%）的比例更高。我们的研究结果表明，虽然一个核心细菌群落在不同地区持续存在，但环境因素显著影响非核心分类群的多样性。例如，在姆普马兰加，相关性分析表明，伯克霍尔德菌科和共生杆菌科等科的丰度受湿度和每日最低温度的影响，而在自由州，WS2 和军团菌科等科受每日最高温度、土壤 pH 值和质地的影响。这些发现强调了气候和土壤性质对根际微生物组的影响，并突出了在不断变化的环境条件下理解这些模式对提高作物产量的重要性。
