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- Title
CELLULOLYTIC BACTERIA CAPABLE OF NITROGEN FIXATION IN SALINE-SODIC GRASSLAND SOILS .
- Authors
H. L., WANG; Z. K., GONG; J. H., WU; D., WANG; D. B., LIU; D. L., WANG
- Abstract
Cellulolytic plate bacteria are considered to be the major drivers of litter decomposition and play critical roles in soil conditioning and nutrient cycling. With the goal to identify strategies used by soil cellulolytic bacteria to overcome nitrogen limitation characteristic of saline-sodic grasslands, cellulolytic strains were isolated from the soil of such habitats in northeast China and their abilities to fix nitrogen were evaluated. Sequencing of the 16S rRNA gene indicated that Streptomyces strains were the most abundant cellulolytic microorganisms in this saline-sodic soil. Most of the isolates exhibited extracellular carboxymethyl cellulase (CMCase) and xylanase activities. Importantly, all the cellulolytic isolates from grassland soils with various vegetation types demonstrated nitrogen-fixing activities ranging from 10.80 to 33.36 nmol C2H4·h-1 ·ml-1 . The cellulolytic isolates also exhibited indole-3-acetic (IAA) acid production abilities ranging from 2.40 to 80.69 μg·ml-1 . These findings provided the first evidence that cellulolytic bacteria likely adapted to the low-nitrogen saline-sodic grassland soils with the acquisition of nitrogenfixing abilities
- Subjects
CHINA; CELLULOLYTIC bacteria; GRASSLAND soils; NITROGEN fixation; NUTRIENT cycles; SOIL microbiology; XYLANASES
- Publication
Applied Ecology & Environmental Research, 2021, Vol 19, Issue 2, p867
- ISSN
1589-1623
- Publication type
Article
- DOI
10.15666/aeer/1902_867879