期刊
SOIL BIOLOGY & BIOCHEMISTRY
卷 97, 期 -, 页码 83-91出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.soilbio.2016.03.004
关键词
Biofertilizer; Climate change; Greenhouse gas; Mitigation technology; Plant growth-promoting rhizobacteria
类别
资金
- Japan Society for the Promotion of Science [14F04390]
- Program for Promotion of Basic and Applied Researches for Innovations in Bio-oriented Industry [26037B]
- Science and Technology Research Promotion Program for Agriculture, Forestry, Fisheries and Food Industry [27004C]
- Grants-in-Aid for Scientific Research [14F04390, 15J09200] Funding Source: KAKEN
The aim of this study was to screen nitrous oxide (N2O)-reducing denitrifier strains showing both N2O mitigation and plant growth-promoting (PGP) effects in soil systems, and the effects of selected strains were monitored in soil and plant, analyzed, and comparatively evaluated. Forty denitrifier strains affiliated with Azospirillum and Herbaspirillum, previously isolated from three different paddy soils, were evaluated. Of these, 11 produced indole-3-acetic acid (>5 jig mL(-1)), 9 promoted the growth of red clover (Trifolium pratense L. var. Medium) or timothy (Phleum pratense L. var. Horizon) on agar plates, and 7 were inoculated into two different soils for cultivating red clover and timothy in a greenhouse. Compared with non-inoculated control, N2O flux from red clover soil and from timothy soil were significantly lower 8 and 14 days and 9 days onwards, respectively, after inoculation with these seven strains. Cumulative N2O emissions from red clover soil were significantly lowered through inoculation with these seven strains. The growth parameters, including plant height, leaf area, fresh weight or dry weight, of the two pasture plants were significantly greater in soils inoculated with most of these seven strains than in non inoculated soils. The uptake of C and N by the two pasture plants was significantly greater in soils inoculated with most of these seven strains than in non-inoculated soils. In conclusion, inoculating N2O reducing denitrifiers to pasture soil could mitigate N2O emissions and simultaneously promote the growth of pasture plants in a greenhouse. These strains will be invaluable microbiological resources for developing novel biofertilizers. (C) 2016 Elsevier Ltd. All rights reserved.
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