1. Effect of plant age on endophytic bacterial diversity of balloon flower (Platycodon grandiflorum) root and their antimicrobial activities.
- Author
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Asraful Islam SM, Math RK, Kim JM, Yun MG, Cho JJ, Kim EJ, Lee YH, and Yun HD
- Subjects
- Anti-Bacterial Agents isolation & purification, Antibiosis, Antifungal Agents isolation & purification, Bacillus classification, Bacillus genetics, Bacillus isolation & purification, Bacillus metabolism, Biodiversity, Brevibacillus classification, Brevibacillus genetics, Brevibacillus isolation & purification, Brevibacillus metabolism, DNA, Bacterial genetics, Enterobacter classification, Enterobacter genetics, Enterobacter isolation & purification, Enterobacter metabolism, Micrococcus luteus classification, Micrococcus luteus genetics, Micrococcus luteus isolation & purification, Micrococcus luteus metabolism, Pest Control, Biological, Phylogeny, Plant Diseases microbiology, Platycodon growth & development, RNA, Ribosomal, 16S analysis, Rhizobium tropici classification, Rhizobium tropici genetics, Rhizobium tropici isolation & purification, Rhizobium tropici metabolism, Sequence Analysis, DNA, Soil Microbiology, Symbiosis, Anti-Bacterial Agents pharmacology, Antifungal Agents pharmacology, Bacteria classification, Bacteria genetics, Bacteria isolation & purification, Bacteria metabolism, Plant Roots microbiology, Platycodon microbiology
- Abstract
Balloon flower (Platycodon grandiflorum) is widely cultivated vegetable and used as a remedy for asthma in East Asia. Experiments were conducted to isolate endophytic bacteria from 1-, 3-, and 6-year-old balloon flower roots and to analyze the enzymatic, antifungal, and anti-human pathogenic activities of the potential endophytic biocontrol agents obtained. Total 120 bacterial colonies were isolated from the interior of all balloon flower roots samples. Phylogenetic analysis based on 16S rRNA gene sequences showed that the population of 'low G + C gram-positive bacteria' (LGCGPB) gradually increased 60.0-80.0% from 1 to 6 years balloon flower sample. On the other hand, maximum hydrolytic enzyme activity showing endophytic bacteria was under LGCGPB, among the bacterial strains, Bacillus sp. (BF1-1 and BF3-8), Bacillus sp. (BF1-2 and BF3-5), and Bacillus sp. (BF1-3, BF3-6, and BF6-4) showed maximum enzyme activities. Besides, Bacillus licheniformis (BF3-5 and BF6-6) and Bacillus pumilus (BF6-1) showed maximum antifungal activity against Phytophthora capsici, Fusarium oxysporum, Rhizoctonia solani, and Pythium ultimum. Moreover, Bacillus licheniformis was found in 3 and 6 years balloon flower roots, but Bacillus pumilus was found only in 6 years sample. It is presumed that older balloon flower plants invite more potential antifungal endophytes for there protection from plant diseases. In addition, Bacillus sp. (BF1-2 and BF3-5) showed maximum anti-human pathogenic activity. So, plant age is presumed to influence diversity of balloon flower endophytic bacteria.
- Published
- 2010
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