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All Journal Biodiversitas Journal of Biological Diversity
TRUONG QUOC TAT
Faculty of Technology and Engineering, Dong Thap University. 783 Pham Huu Lau Street, Ward 6, Cao Lanh City 870000, Vietnam
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology

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Characterization and identification of potential cellulolytic bacteria for bio-degradation of durian shell waste in Mekong Delta, Vietnam TRUONG QUOC TAT; NGUYEN DUY KHANH; QUACH VAN CAO THI
Biodiversitas Journal of Biological Diversity Vol. 25 No. 11 (2024)
Publisher : Society for Indonesian Biodiversity

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/biodiv/d251128

Abstract

Abstract. Tat TQ, Khanh ND, Thi QVC. 2024. Characterization and identification of potential cellulolytic bacteria for bio-degradation of durian shell waste in Mekong Delta, Vietnam. Biodiversitas 25: 4284-4291. Microorganisms play crucial roles in the decomposition of plant biomass. This study aimed to isolate, screen, and identify potential mesophilic cellulose-degrading bacterial (CDB) strains from natural compost from durian shells (DS). Results revealed that a total of fifteen aerobic strains were isolated at 37°C, thirteen of which exhibited enzymatic degradation of cellulose, with cellulolytic index (CI) values ranging from 0.34 to 3.22. Five strains with CI values greater than 2.0 presented potential extracellular cellulase enzyme activity, with carboxymethyl cellulase (CMCase) at 0.18-0.31 U/mL and filter paper cellulase (FPase) at 0.03-0.19 U/mL. The DSC.03 and DSC.04 strains showed the highest CMCase and FPase activities, respectively. Subsequently, molecular identification and phylogenetic analysis confirmed DSC.03 (PP851408.1) and DSC.04 (PP851410.1) isolates as Bacillus subtilis and Bacillus velezensis, respectively. The maximum bio-degradation percentages were 86.85% for filter paper and 48.72% for dry DS powder, which occurred in the mixed-culture treatment of the two selected strains after 15 days of incubation under shaking conditions at 150 rpm and 37°C. These findings indicate for the first time that natural durian shell compost contains potential cellulose-degrading bacterial communities with high extracellular enzyme-producing ability and active interactions with each other, which can be beneficial for the fermentation or composting of DS waste.
Isolation and identification of salt-tolerant, phosphorus-solubilizing bacterial strains from rice soil in rice-shrimp farming systems in Tien Giang Province, Vietnam TRUONG QUOC TAT
Biodiversitas Journal of Biological Diversity Vol. 25 No. 10 (2024)
Publisher : Society for Indonesian Biodiversity

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/biodiv/d251047

Abstract

Abstract. Tat TQ. 2024. Isolation and identification of salt-tolerant, phosphorus-solubilizing bacterial strains from rice soil in rice-shrimp farming systems in Tien Giang Province, Vietnam. Biodiversitas 25: 3868-3875. This study aimed to isolate, select, and identify the phosphate-soluble bacterial (PSB) pathogens from eight salt-affected soil samples collected from paddy rice fields in the Go Cong Dong and Tan Phu Dong districts of Tien Giang Province, Vietnam. Bacteria were isolated on Pikovskaya’s agar media supplemented with 1% NaCl, and the amount of phosphorus dissolved in liquid NBRIP was supplemented with various concentrations of NaCl via molybdate coloration to evaluate the salt tolerance and phosphorus solubility of the isolated bacterial strains. The result showed that from 8 saline soil samples, a total of 15 strains of phosphorus solubilizing bacteria were isolated and 2 (code 1.7 and 6.1) of them showed good phosphorus solubilization. In addition, isolates 1.7 and 6.1 exhibited good growth and phosphorus solubilization in liquid NBRIP media supplemented with NaCl at concentrations ranging from 1.0% to 5.0%. Molecular analysis results showed that strains 1.7 and 6.1 were identified as Burkholderia vietnamiensis 1.7 and Priestia aryabhattai 6.1, respectively. These results show that B. vietnamiensis 1.7 and P. aryabhattai 6.1 can be used as biofertilizers for rice cultivation in salty soils in Tien Giang Province, reducing the cost and use of chemical fertilizers.
Co-Authors NGUYEN DUY KHANH QUACH VAN CAO THI