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Characterization and ecological role of free-living nitrogen-fixing bacteria isolated from the rhizoplane of Melastoma malabathricum inhabiting acidic plain lands in Kalimantan

机译:从加利曼丹酸性平原上居住的黄萎病菌根际平面分离的固氮细菌的特性和生态作用

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摘要

The rhizoplane microorganisms of Melastoma malabathricum, distributing throughout the acid sulfate and peat soils of South Kalimantan, Indonesia, were investigated, using a soft gel media of N-free Winogradsky's mineral solution solidified with 0.3 % gellan gum. Two bacteria, Sphingomonas rosa EC-K013 and Burkholderia cepacia EC-K014 belonging to the subclasses of α- and β-Proteobacteria, respectively, emerged in the nitrogen-free medium. Inoculation of S. rosa EC-K013 in the M. malabathricum seedlings grown in N-free, 1/4 Hoagland's No. 2 medium (pH 3.0) resulted in better growth of the seedlings. In the soft gel medium, EC-K013 also stimulated the growth of a root-associating fungus, tentatively identified as Nectria sp. and a nitrogen-fixer, Mesorhizobium sp., suggesting that S. rosa plays an important role in promotion of microfloral devlopment around the rhizosphere of some acidic soil-adapting plants.
机译:使用0.3%吉兰糖胶固化的无N的Winogradsky矿物质溶液的软凝胶介质,研究了分布于印度尼西亚南加里曼丹的酸性硫酸盐和泥炭土壤中的马拉巴甜菜根瘤菌。在无氮培养基中出现了两种细菌,分别是罗氏鞘氨醇单胞菌EC-K013和洋葱伯克霍尔德菌EC-K014,它们分别属于α-和β-变形杆菌属。在无氮,1/4 Hoagland No. 2培养基(pH 3.0)中生长的马拉巴沙门氏菌幼苗中接种罗莎沙门氏菌EC-K013可使幼苗更好地生长。在软凝胶培养基中,EC-K013还刺激了根系真菌的生长,该真菌初步鉴定为Nectria sp。和固氮菌Mesorhizobium sp。的研究表明,罗莎沙门氏菌在促进某些酸性土壤适应植物根际周围的微生物群落发育方面起着重要作用。

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