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Indiragandhi P.,Youlee Joo,Jeong-Oh Yang,Gil-Hah Kim 한국응용곤충학회 2008 한국응용곤충학회 학술대회논문집 Vol.2008 No.10
Tobacco whitefly-Bemisia tabaci is considered one of the most important pests in tropical and subtropical agriculture, as well as in production systems in glasshouses in temperate zones. Principle research on the identity of B. tabaci began with the recognition of more than one biotype differing in life history parameters, host plant associations, plant-related damage and insecticide resistance. Our laboratory strains of B. tabaci were identified and classified as biotype B and Q, through mtCOI PCR. Also, they were tested for their host plant preference and reaction to different insecticide. Biotype Q prefers to feed on red pepper and tomato, was less susceptible to tested insecticides, for instance acetamipirid, spinosad and thiamethoxam, than the biotype B (feed on tomato alone). There has been a report on the presence of gut bacteria in B. argentifolii (= B. tabaci biotype B) and its influence on the host insect processes. Hence, as a further pursuit, we examined our laboratory B. tabaci biotypes B and Q for their gut bacteria, whether these two biotypes are differed with each other. Gut bacterial strains isolated by standard surface sterilization method was identified through 16S rRNA gene sequence. Gut bacterial strains of B. tabaci biotypes B and Q and their close relatives retrieved from the public database (NCBI) indicated that the biotype B was less diversified only with four genera viz., Bacillus, Micrococcus, Pseudomonas and Staphylococcus, whereas the biotype Q diversified with six such as Bacillus, Janibacter, Micrococcus, Staphylococcus, Stenotrophomonas, and Streptomyces. Results of the present investigation suggesting that there may be a relationship with gut bacterial strains and susceptibility to insecticides and host plant preference of B. tabaci biotype B and Q.
Comparison of Bacterial Diversity Isolated from the Twospotted Spider Mite Resistant to Acaricide
P. Indiragandhi,Changmann Yoon,Yoo-Lee Ju,Suwon Cho,Gil-Hah Kim 한국응용곤충학회 2009 한국응용곤충학회 학술대회논문집 Vol.2009 No.05
This study was performed to investigate the bacterial diversity isolated from the twospotted spider mite and to interpret their correlation between insect bacteria and acaricide resistance. Twospotted spider mite, Tetranychus urticae was used the resistance strains, which developed over eight years to the six acaricides such as abamectin, acequinocyl, bifenozate, etoxazole, fenpropathrin, and pyridaben, respectively. After cultivating the bacteria from body maceration, bacterial colony was selected and identified through 16S rRNA gene sequences. We are identified six genus from Pyridaben resistant strain, five genus from acequinocyl, three genus from abamectin, bifenozate, etoxazole, and two genus from fenpropathrin. However, we could not found correlation between bacterial density and diversity (phylotypes) among these resistant strains. By analyzing the diversity of population microorganisms, fenpropathrin was showed 40% of Cs value (Similarity coefficient) with susceptible strain, however, abamectin and pyridaben were perfectly different (0%) with susceptible strain. It remains to be learned about how microorganisms co-evolutionary developed with their host insect correlating to the resistance and how microorganisms play role in acaricide resistant mite.
Kyoung-A Kim,P. Indiragandhi,R. Anandham,P. Palaniappan,P. Trivedi,M. Madhaiyan,Gwang-Hyun Han,Tong-Min Sa 한국토양비료학회 2008 한국토양비료학회지 Vol.41 No.1
Pseudomonas sp. PRGB06, a bacterial strain isolated from diamondback moth (Plutella xylostella) gut, was examined for its plant growth promotion and biofertilizing traits. The bacteria growth was observed under various conditions of carbon sources, temperature, pH and salt concentrations. In addition, the mechanisms of antagonism and phosphate solubilization were investigated. The bacterial strain PRGB06, grew well using most of the tested carbon sources. The best growth was observed at 30℃ and pH 7. The inhibition of the pathogenic fungi was likely due to the volatile antifungal metabolite and ammonia gas produced by the bacteria. A significant positive relationship was found between the phosphate solubilization and acid production. When inoculated with PRGB06 in vitro and in gnotobiotic condition, red pepper and maize showed increase in root length, seedling vigor and dry bio-mass.
( R. Anandham ),( P. Indiragandhi ),( M. Madhaiyan ),( Jong Bae Chung ),( Kyoung Yul Ryu ),( Hyeong Jin Jee ),( Tong Min Sa ) 한국미생물 · 생명공학회 2009 Journal of microbiology and biotechnology Vol.19 No.1
The mixotrophic growth with methanol plus thiosulfate was examined in nutrient-limited mixotrophic condition for Methylobacterium goesingense CBMB5 and Methylobacterium fujisawaense CBMB37. Thiosulfate oxidation increased the growth and protein yield in mixotrophic medium that contained 150mM methanol and 20mM sodium thiosulfate, at 144 h. Respirometric study revealed that thiosulfate was the most preferable reduced inorganic sulfur source, followed by sulfite and sulfur. M. goesingense CBMB5 and M. fujisawaense CBMB37 oxidized thiosulfate directly to sulfate, and intermediate products of thiosulfate oxidation such as polythionates, sulfite, and sulfur were not detected in spent medium and they did not yield positive amplification for tested soxB primers. Enzymes of thiosulfate oxidation such as rhodanese and sulfite oxidase activities were detected in cell-free extracts of M. goesingense CBMB5, and M. fujisawaense CBMB37, and thiosulfate oxidase (tetrathionate synthase) activity was not observed. It indicated that both the organisms use the "non-S4 intermediate" sulfur oxidation pathway for thiosulfate oxidation. It is concluded from this study that M. goesingense CBMB5, and M. fujisawaense CBMB37 exhibited mixotrophic metabolism in medium containing methanol plus thiosulfate and that thiosulfate oxidation and the presence of a "Paracoccus sulfur oxidation" (PSO) pathway in methylotrophic bacteria are species dependant.