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Indiragandhi, Pandiyan,Anandham, Rangasamy,Madhaiyan, Munusamy,Kim, Gil-Hah,Sa, Tongmin Oxford University Press 2008 FEMS microbiology letters Vol.289 No.1
<P>Siderophore production by entomo- and phytopathogens, plus the cross-utilization of these siderophores and expression of outer membrane receptor proteins (OMRPs) by Diamondback moth (DBM) gut bacterial strains, were all examined. All the tested strains grew in the presence of 2, 2'-dipyridyl, and the Brachybacterium sp. PSGB10, Pseudomonas sp. PRGB06, and Serratia marcescens FLGB16 strains were found to cross-utilize the siderophores of various entomopathogens, including Bacillus thuringiensis. A sodium dodecyl sulfate-polyacrylamide gel electrophoresis analysis also showed the presence of the OMRPs responsible for the siderophore cross-utilization. In contrast, Stenotrophomonas sp. PRGB08 was unable to cross-utilize siderophores and did not express OMRPs. Thus, siderophore cross-utilization and OMRP expression by the DBM gut bacterial strains would seem to support the potential for microbial populations in the insect gut to evolve efficient mechanisms to overcome any iron limitation imposed by the host insect and eventually contribute to the defense mechanism of the host insect. Furthermore, it is important to consider that other biologically active metabolites produced by insect gut microorganisms may also confer a protective effect on a host insect species.</P>
Pandiyan Indiragandhi,Chang Mann Yoon,Jeong Oh Yang,Soo Won Cho,Tong Min Sa,Gil Hah Kim 한국응용생명화학회 2010 Applied Biological Chemistry (Appl Biol Chem) Vol.53 No.5
Whiteflies are sap-sucking insects belonging to the hemipteran order. They are well known for their menace to agriculture, as pests and vectors, and are reported for their bacterial and Rickettsia association in B biotype. In the present investigation, cul
Indiragandhi, Pandiyan,Yoon, Chang-Mann,Yang, Jeong-Oh,Cho, Soo-Won,Sa, Tong-Min,Kim, Gil-Hah The Korean Society for Applied Biological Chemistr 2010 Applied Biological Chemistry (Appl Biol Chem) Vol.53 No.5
Whiteflies are sap-sucking insects belonging to the hemipteran order. They are well known for their menace to agriculture, as pests and vectors, and are reported for their bacterial and Rickettsia association in B biotype. In the present investigation, culture-dependent and -independent methods were used to reveal the bacterial phylotypes associated with B and Q biotypes. Cultivable bacterial phylotypes varied with respect to growth media and biotypes. Twenty different bacterial genera, including 31 species belong to Actinobacteria, 'alpha'-, 'beta'-, 'gamma'- Proteobacteria, and Firmicutes were isolated from both the biotypes. Of the seventeen phylotypes, Bacillus, Kocuria, Moraxellla, Micrococcus, Sphingomonas and Staphylococcus were common to both B and Q biotypes. Moreover, B biotype was associated with Acinetobacter, Deinococcus, Modestobacter, Microbacterium, and Pseudomonas, whereas Q biotype was associated with Arthrobacter, Bradyrhizobium, Janibacter, Morganella, Naxibacter, and Streptomyces. Application of a culture-independent method revealed the presence of additional symbiotic bacteria: Rickettsia in B biotype and Halomonas in Q biotype, as well as primary endosymbiont in both biotypes, which could not be obtained through culture-dependent method. Presence of Staphylococcus, Micrococcus (in both B and Q biotypes), and Bacillus (only in B biotype) in all developmental stages of B. tabaci indicated their close association with host insect.
( Chang Mann Yoon ),( Pandiyan Indiragandhi ),( Rangasamy Anandham ),( Soo Won Cho ),( Tong Min Sa ),( Gil Hah Kim ) 한국응용생명화학회 2010 Applied Biological Chemistry (Appl Biol Chem) Vol.53 No.4
Investigations of the diversity of bacteria in acaricide resistant and susceptible populations from the whole mite extracts of twospotted spider mite-Tetranychus urticae were made using 8 different bacterial growth media and identified through 16S rRNA gene sequence analysis. The pyridaben resistant population was diversified with six genera including Chryseobacterium, Sphingomonas, Acidovorax, Herbaspirillum, Janthinobacterium, and Xenophilus, whereas the acequinocyl resistant population was associated with Bacillus, Pasteurella, Staphylococcus, Enterobacter, and Pseudomonas. The fenpropathrin resistant population harbored only two phylotypes (Pantoea and Pseudomonas). Citrobacter, Enterobacter, and Pantoea were recovered from the susceptible population. No correlation was observed between bacterial density and bacterial diversity. Of the 8 different growth media, R2A supported a greater number of cultivable bacterial phylotypes followed by Luria Bertani and brain heart infusion agar. This study suggests that knowledge of the diversity of bacterial phylotypes present in host insect pest species may be useful for developing biological approaches in insect-microbe interaction.
Yoon, Chang-Mann,Indiragandhi, Pandiyan,Anandham, Rangasamy,Cho, Soo-Won,Sa, Tong-Min,Kim, Gil-Hah The Korean Society for Applied Biological Chemistr 2010 Applied Biological Chemistry (Appl Biol Chem) Vol.53 No.4
Investigations of the diversity of bacteria in acaricide resistant and susceptible populations from the whole mite extracts of twospotted spider mite-Tetranychus urticae were made using 8 different bacterial growth media and identified through 16S rRNA gene sequence analysis. The pyridaben resistant population was diversified with six genera including Chryseobacterium, Sphingomonas, Acidovorax, Herbaspirillum, Janthinobacterium, and Xenophilus, whereas the acequinocyl resistant population was associated with Bacillus, Pasteurella, Staphylococcus, Enterobacter, and Pseudomonas. The fenpropathrin resistant population harbored only two phylotypes (Pantoea and Pseudomonas). Citrobacter, Enterobacter, and Pantoea were recovered from the susceptible population. No correlation was observed between bacterial density and bacterial diversity. Of the 8 different growth media, R2A supported a greater number of cultivable bacterial phylotypes followed by Luria Bertani and brain heart infusion agar. This study suggests that knowledge of the diversity of bacterial phylotypes present in host insect pest species may be useful for developing biological approaches in insect-microbe interaction.
Chang Mann Yoon,Pandiyan Indiragandhi,Rangasamy Anandham,Soo Won Cho,Tong Min Sa,Gil Hah Kim 한국응용생명화학회 2010 Journal of Applied Biological Chemistry (J. Appl. Vol.53 No.4
Investigations of the diversity of bacteria in acaricide resistant and susceptible populations from the whole mite extracts of twospotted spider mite-Tetranychus urticae were made using 8 different bacterial growth media and identified through 16S rRNA gen