Steinberger Yosef, Levi May, Applebaum Itaii, Sherman Chen, Doniger Tirza, Unc Adrian
The Mina & Everard Goodman Faculty of Life Sciences, Bar-Ilan University, Ramat Gan 5290002, Israel.
School of Science and the Environment, Memorial University of Newfoundland, Corner Brook, NL A2H 5G4, Canada.
Microorganisms. 2025 Apr 7;13(4):838. doi: 10.3390/microorganisms13040838.
Wheat is the largest terrestrial agricultural crop globally. This study was conducted to determine the soil microbial biomass, soil CO evolution, and physiological profile in the rhizosphere of the winter wheat rain-fed along the development stages in a rain-fed semi-arid agro-ecosystem. The data show that a significant, over 100-fold increase in the utilization of four substrate groups (benzoic acid, amino acid, carbohydrates, and carboxylic acid) occurred in the wheat soil rhizosphere along the wheat growth phenology. After the stubble field stage, there was a notable decrease in the utilization of all four substrates. The occurrence of each substrate in the soil aligns with the below-ground rhythm of wheat plant biomass growth. The abundance of fine roots, categorizing wheat plant roots, in the soil at maturity and the stubble field stage may explain the heightened activity and diversity of copiotroph bacteria. This association suggests a potential link between the richness of fine roots and the increased activity and diversity of copiotroph bacteria in the soil. The findings clarify the impact of constraining abiotic factors, coupled with the phenological influences of wheat plants, and their combined effects on substrate utilization by microbial communities in a rain-fed wheat field.
小麦是全球最大的陆地农作物。本研究旨在确定雨养半干旱农业生态系统中冬小麦在不同发育阶段根际土壤微生物生物量、土壤CO释放量以及生理特征。数据表明，随着小麦生长物候期的推进，小麦根际土壤中四类底物（苯甲酸、氨基酸、碳水化合物和羧酸）的利用率显著增加，增幅超过100倍。茬田期过后，所有四类底物的利用率均显著下降。土壤中各类底物的出现情况与小麦植株地下生物量的生长节律相符。成熟期和茬田期土壤中作为小麦植株根系分类的细根丰度，可能解释了富营养细菌活性和多样性的提高。这种关联表明细根丰富度与土壤中富营养细菌活性和多样性增加之间存在潜在联系。研究结果阐明了限制性非生物因素的影响，以及小麦植株物候影响，及其对雨养麦田微生物群落底物利用的综合作用。
