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( Aritra Roy Choudhury ),( Mak Chanratana ),( Shamim Ahmed ),( Md Abdul Halim ),사동민 ( Tongmin Sa ) 한국환경농학회 2017 한국환경농학회 학술대회집 Vol.2017 No.-
The formulation of plant growth promoting bacteria as a potential bioinoculant to combat against various biotic and abiotic stresses have been shown to be beneficial for both plants and environment. The industrial application and market value of bioinoculants compared to conventional fertilizers are not high. The major limitations are low quality and the lack of applicable formulation for bioinoculants. These bioinoculants need proper carrier materials for delivery into the agricultural lands for their enhanced functionality, survivability and increase in their shelf life during storage. This study was conducted to compare the plant growth promoting effects of immobilized M. oryzae CBMB20 in chitosan and alginate beads on tomato plant under greenhouse conditions. The immobilized M. oryzae CBMB20 in various formulations were c ted in tomato (Solanum lycopersicum) seeds using 1% (w/v) carboxymethyl cellulose as an adhesive. Various physiological properties of plants such as plant length, dry weight of root and shoot, etc were measured after 15 days of transplanting. The survivability of M. oryzae CBMB20 and degradation of carrier material in soil was checked in regular intervals during the growing stage of tomato plant. The application of chitosan immobilized M. oryzae CBMB20 indicated up to 1.3 fold increase in the shoot and root lengths as well as plant dry weight of tomato plant under greenhouse condition compared to other treatments. The chitosan treated tomato seeds showed significant increase in germination percentage and chlorophyll content. Immobilized M. oryzae CBMB20 showed 1.5 fold higher survivability in tomato rhizosphere soil compared to free cells with around 4.35 log CFU g<sup>-1</sup> of soil for chitosan at 21 DAS. The alginate beads got fully degraded whereas there was partial degradation of chitosan beads after 30 days. Chitosan was able to keep a considerable survivability of M. oryzae CBMB20 for over 20 days. These observations confer that chitosan is more suitable carrier material for immobilizing M. oryzae CBMB20. Furthermore, such formulation holds good promise to be utilized with other PGPB strains and crops for potential large scale application in agricultural fields.
( 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.
( Kishore Kumar Joshi ),( Varun Kumar ),( Ramesh Chand Dubey ),( Dinesh Kumar Maheshwari ),( Vivek K. Bajpai ),( Sun Chul Kang ) 한국환경농학회 2006 한국환경농학회지 Vol.25 No.3
Pseudomonas aeruginosa GRC2, siderophore-producing strain, inhibited growth of Macrophomina phaseolina in vitro and reduced charcoal rot in seeds of Brassica juncea in field when coated with adaptive strains. P. aeruginosa GRC2 and Azotobacter chroococcum AC1 produced indole-3-acetic acid and solubilized insoluble phosphate. A. chroococcum AC1 fixed nitrogen asymbiotically. Urea and diammonium phosphate-adaptive variant strains of P. aeruginosa and A. chroococcum strongly inhibited M. phaseolina in comparison to parental strains. Bacterization of seeds induced seed germination, seedling growth, and enhanced yield of B. juncea by 10.87% as compared to full doses of urea and diammonium phosphate. Both adaptive strains of chemical fertilizers aggressively colonized roots, showing effectiveness to growth and developments of B. juncea.
Suriyachadkun Chanwit,Chunhachart Orawan,Srithaworn Moltira,Tangchitcharoenkhul Rungnapa,Tangjitjareonkun Janpen 한국미생물·생명공학회 2022 Journal of microbiology and biotechnology Vol.32 No.11
Zinc-solubilizing bacteria can convert the insoluble form of zinc into soluble forms available to plants. This study was conducted to isolate and screen zinc-solubilizing actinobacteria from rhizosphere soils and to assess their effect on vegetable soybean growth. In total, 200 actinobacteria strains belonging to 10 genera were isolated from rhizosphere soil samples. Among these isolates, four showed zinc solubilization with solubilizing index values ranging from 3.11 to 3.78 on Bunt and Rovira agar supplemented with 0.1% zinc oxide. For the quantitative assay, in broth culture, strains CME34 and EX51 solubilized maximum available zinc contents of 529.71 and 243.58 μg/ml. Furthermore, indole-3-acetic acid (IAA) and ammonia were produced by these two strains, the strain CME34 produced the highest amount of IAA 4.62 μg/ml and the strain EX51 produced the highest amount of ammonia 361.04 μg/ml. In addition, the phosphate-solubilizing abilities in Pikovskaya’s medium of CME34 and EX51 were 64.67 and 115.67 μg/ml. Based on morphological and biochemical characterization and 16S rDNA sequencing, the strains CME34 and EX51 were closely related to the genus Streptomyces. In a greenhouse experiment, single-strain inoculation of Streptomyces sp. CME34 or EX51 significantly increased the shoot length, root length, plant dry weight, number of pods per plant and number of seeds per plant of vegetable soybean plants compared to the uninoculated control. These findings facilitated the conclusion that the two Streptomyces strains have potential as zinc solubilizers and can be suggested as bioinoculants to promote the growth and yield of soybean.