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Distinctive phyllosphere bacterial communities in tropical trees.
Kim, Mincheol,Singh, Dharmesh,Lai-Hoe, Ang,Go, Rusea,Abdul Rahim, Raha,Ainuddin, A N,Chun, Jongsik,Adams, Jonathan M Springer-Verlag 2012 Microbial ecology Vol.63 No.3
<P>Recent work has suggested that in temperate and subtropical trees, leaf surface bacterial communities are distinctive to each individual tree species and dominated by Alpha- and Gammaproteobacteria. In order to understand how general this pattern is, we studied the phyllosphere bacterial community on leaves of six species of tropical trees at a rainforest arboretum in Malaysia. This represents the first detailed study of 'true' tropical lowland tree phyllosphere communities. Leaf surface DNA was extracted and pyrosequenced targeting the V1-V3 region of 16S rRNA gene. As was previously found in temperate and subtropical trees, each tree species had a distinctive bacterial community on its leaves, clustering separately from other tree species in an ordination analysis. Bacterial communities in the phyllosphere were unique to plant leaves in that very few operational taxonomic units (0.5%) co-occurred in the surrounding soil environment. A novel and distinctive aspect of tropical phyllosphere communities is that Acidobacteria were one of the most abundant phyla across all samples (on average, 17%), a pattern not previously recognized. Sequences belonging to Acidobacteria were classified into subgroups 1-6 among known 24 subdivisions, and subgroup 1 (84%) was the most abundant group, followed by subgroup 3 (15%). The high abundance of Acidobacteria on leaves of tropical trees indicates that there is a strong relationship between host plants and Acidobacteria in tropical rain forest, which needs to be investigated further. The similarity of phyllosphere bacterial communities amongst the tree species sampled shows a significant tendency to follow host plant phylogeny, with more similar communities on more closely related hosts.</P>
Seunghee KIM,Jeongho LEE,Hyerim SON,Ji Yeh HONG,Min Young JEONG,Su Jin CHOI,Kang Hyun LEE,Rusea GO,Sangho CHOI,Hah Young YOO 한국생물공학회 2021 한국생물공학회 학술대회 Vol.2021 No.10
Since ancient times, some plants with antibacterial, anti-inflammatory and antioxidant properties have been used in traditional medicine. In this study, the tropical plants from Malaysia were obtained by the International Center for Biological Materials Research (IBMRC), and the antibacterial activity of 87 samples was investigated. The antibacterial activity was determined by the disc diffusion method using gram-positive and gram-negative bacteria. As a result, 6 extracts that significantly represented an inhibition zone against Gram-positive bacteria are as follows: Rhodamnia uniflora, Melastoma molle, Ochanostachys amentacea, Syzygium attenuatum, Melastoma muticu, Garcinia mangostana. In addition, extracts from G. mangostana and Leea indica showed antibacterial activity against Gram-negative bacteria. In conclusion, it was confirmed that extract from G. mangostana has high antibacterial activity and can be used as an antimicrobial substance with a wide range because it can be applied to both gram-positive and gram-negative.
Tropical Soil Bacterial Communities in Malaysia: pH Dominates in the Equatorial Tropics Too
Tripathi, Binu M.,Kim, Mincheol,Singh, Dharmesh,Lee-Cruz, Larisa,Lai-Hoe, Ang,Ainuddin, A. N.,Go, Rusea,Rahim, Raha Abdul,Husni, M. H. A.,Chun, Jongsik,Adams, Jonathan M. Springer-Verlag 2012 Microbial ecology Vol.64 No.2