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Decoding the link between bacterial diversity and enzymatic activities of soil from Cymbopogon flexuosus growing dryland
Applied Soil Ecology ( IF 4.8 ) Pub Date : 2021-07-28 , DOI: 10.1016/j.apsoil.2021.104150
Priyambada Singh 1, 2, 3 , Vineet Yadav 1, 3 , Yogita Deshmukh 1 , Paurabi Das 1, 3 , Raghavendra Pratap Singh 1 , Nasreen Bano 4 , Mithun Kumar 2 , Ashutosh K. Shukla 3, 5 , Alok Krishna 2, 3 , Puja Khare 1, 3
Affiliation  

The rhizospheric microbial communities and enzymes involved in nutrient mineralization play a vital role in plant and soil health particularly under abiotic stress conditions. Hence, the investigation has been made on the activities of enzymes involved in carbon, nitrogen, phosphorus, and sulfur cycles and metabolic potentials microbial communities of rhizospheric soil of drought-affected areas planted with Cymbopogon flexuosus (lemongrass). The slips of C. flexuosus were planted in the six drought-affected areas of India along with one irrigated region as control following randomized block design. The pH of soils varied from 5.7 to 9.4, whereas, microbial biomass content ranged from 80 μg g−1 (sodic soil) to 813 μg g−1 (black humus granitic soil) μg g−1. Enhanced enzymatic activities were found after two years at all the experimental sites planted with C. flexuosus. In comparison with the drought-affected site, higher microbial diversity (highest Shannon Index) was observed at the irrigated site. The results showed that soil microbiota was dominated by Proteobacteria followed by Firmicutes and Acidobacteria, whereby, Methylobacterium, Escherichia-Shigella, Sphingomonas, Microbacterium, and Brevibacillus were the dominant genera in the study zone. Acidic soils (pH: 5.7) were observed to have a relatively higher abundance of Acidobacteria, while, alkaline soils (pH: 9.4) demonstrated a higher relative abundance of Proteobacteria. The dominance of Escherichia-Shigella and Sphingomonas was observed in all drought sites and these microbes are involved in carbon metabolism. The relative abundance of Methylobacterium was higher in soils having higher microbial biomass and carbon content. Results revealed that despite the homogenizing effect of the lemongrass cover, the soil pH accounted for an important fraction of the variance of microbial composition and enzymatic activity.



中文翻译:

解读Cymbopogon flexuosus生长旱地土壤细菌多样性与酶活性之间的联系

参与营养矿化的根际微生物群落和酶在植物和土壤健康中起着至关重要的作用,尤其是在非生物胁迫条件下。因此,调查已对参与碳,氮,磷和硫循环和代谢电位的种植有干旱影响地区根际的微生物群落的酶的活性曲序香茅(香茅)。根据随机区组设计,在印度六个受干旱影响的地区和一个灌溉地区种植C. flexuosus 纸条作为对照。土壤的 pH 值从 5.7 到 9.4 不等,而微生物生物量含量从 80 μg g -1(碱土)到 813 μg g -1不等(黑色腐殖质花岗岩土壤) μg g -1。两年后,在所有种植C. flexuosus的试验点发现酶活性增强。与受干旱影响的地点相比,在灌溉地点观察到更高的微生物多样性(最高香农指数)。结果表明,土壤微生物群以变形菌为主,其次是厚壁菌门和酸菌门,其中,甲基杆菌属大肠杆菌-志贺菌属鞘氨醇单胞菌属微杆菌属短杆菌属为研究区的优势属。观察到酸性土壤(pH 值:5.7)具有相对较高的酸杆菌丰度,而碱性土壤(pH 值:9.4)则表现出相对较高的变形菌丰度。在所有干旱地点都观察到埃希-志贺氏菌鞘氨醇单胞的优势,这些微生物参与碳代谢。在微生物生物量和碳含量较高的土壤中,甲基杆菌的相对丰度较高。结果表明,尽管柠檬草覆盖物具有均质作用,但土壤 pH 值占微生物组成和酶活性变化的重要部分。

更新日期:2021-07-29
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