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( Sandipan Samaddar ),( Gwang Hyun Han ),( Puneet Singh Chauhan ),( Poulami Chatterjee ),( Sunyoung Jeon ),( Tongmin Sa ) 한국미생물 · 생명공학회 2019 Journal of microbiology and biotechnology Vol.29 No.2
Soils amended for long-term with high levels of compost demonstrated greater abundance of bacterial members of the phylum Bacteroidetes whereas a decreasing trend in the relative abundance of phylum Acidobacteria was noted with increasing levels of compost. Metabolic profiles predicted by PICRUSt demonstrated differences in functional responses of the bacterial community according to the treatments. Soils amended with lower compost levels were characterized by abundance of genes encoding enzymes contributing to membrane transport and cell growth whereas genes encoding enzymes related to protein folding and transcription were enriched in soils amended with high levels of compost. Thus, the results of the current study provide extensive evidence of the influence of different compost levels on bacterial diversity and community structure in paddy soils.
( Sandipan Samaddar ),김기윤 ( Kiyoon Kim ),( Poulami Chatterjee ),전선영 ( Sunyoung Jeon ),사동민 ( Tongmin Sa ) 한국환경농학회 2017 한국환경농학회 학술대회집 Vol.2017 No.-
Ammonia oxidation is the first and rate-limiting step in nitrification, the oxidation of ammonia to nitrate via nitrite. However, we know little about archaeal population under field conditions, or how their relative contributions to soil nitrification respond to the combination of cropping treatment and seasonal conditions. Archaea especially Ammonia oxidizing archaea are responsible for the rate limiting step in nitrification; a key nitrogen (N) loss pathway in agricultural systems. Among the factors reported to influence the abundance and diversity of archaea are fertilizers (ammonium addition).The main objective of this study is to investigate the abundance and diversity of archaeal community especially nitrifying archaea in paddy fields under five different treatments (No fertilizer (CON), Chemical Fertilizer (CF), Compost (CO), Chemical fertilizer along with Compost (FCO), P & K [N free] (NFR) and how it is correlated to physicochemical parameters and nitrification potential in soil. Soil samples were collected from paddy fields of Department of Southern Area Crop Science, Paddy Crop research Division, Miryang, Republic of Korea and were used to characterize the abundance and diversity of ammonia oxidizing archaeal community based on ammonia monooxygenase gene (amoA). Soil enzyme activities, chemical parameters and nitrification potential were determined in laboratory using standard procedures. Soil nucleic acid was extracted from 0.25 grams of soil using PowerSoil DNA isolation kit (MoBIO, Carlsbad, CA, USA) following the manufacturer`s protocol. Quantitative PCR (qPCR) reactions were performed on a Rotor-Gene 6000 real-time rotary qPCR analyzer (Corbett Research) using SYBR Green PCR master mix (Applied Biosystems). Pyrosequencng of amoA gene was performed on a 454 GS FLX Platform by Macrogen, South Korea. Results revealed the treatments lead to considerable changes in community structure of nitrifying archaea and lead to separate taxonomical placement in a reference tree. The soil factor organic matter was found to contribute significantly for shaping this change in community structure.
( Poulami Chatterjee ),( Sandipan Samaddar ),( Md Abdul Halim ),강연경 ( Yeongyeong Kang ),사동민 ( Tongmin Sa ) 한국환경농학회 2017 한국환경농학회 학술대회집 Vol.2017 No.-
Plant growth and agriculture is largely affected by soil salinity. Increasing trend of salinity stress limits plant metabolism and development. This study was carried out to find out the effect of soil salinity on plant physiology and defense mechanism. As a result of abiotic stress and biotic stress plant emits higher amount of volatile organic compounds (VOC), which tries to help plant to survive under adverse environmental conditions, but this emission is detrimental to the environment. Furthermore, we studied the inoculation effect of halotolerant ACC deaminase-producing bacteria to control volatile emission, impact on photosynthetic machinery in rice plants under saline condition. In this study, we exposed IR29 (salt sensitive) and FL478 (moderately salt tolerant) rice plants to salt stress at different concentrations, such as 0, 50, 100 mM and compared the effect of salt stress on gas exchange attributes, ethylene emission, emission of biogenic volatile organic compounds, between these two rice cultivars. Ethylene is considered as a stress marker for plants. We observed that ethylene emission was markedly higher in salt sensitive rice cultivar, but recovered after Bioinoculation. Higher concentration of salt treatment remarkably reduced Photosynthesis, stomatal conductance to water vapour, and light-adopted photosystem II (PSII) quantum yield estimated by maximum chlorophyll fluorescence (Fv/Fm); IR29 is a known salt sensitive cultivar and FL478 is a moderately salt tolerant cultivar. A clear difference in their photosynthetic activities were observed in response to gas exchange parameters. 1-8-Cineole and δ3-Carene were highly emitted monoterpenes detected under high saline condition. Emission of sesquiterpenes namely, longifolene and α-caryophyllene were markedly higher after 10th day of salt exposure. However, the rate of emission was reduced after Bioinoculation and bacterial inoculation (RS16: Brevibacterium iodinum) in both the cultivars, has recovered rice plants from mild to severe stress.