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ABDJAD ASIH NAWANGSIH
Department of Plant Protection, Faculty of Agriculture, Institut Pertanian Bogor. Jl. Agatis, Dramaga, Bogor 16680, West Java, Indonesia
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology

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TRFLP analysis for revealing the diversity of rice phyllosphere bacteria SRI MARTINA WIRASWATI; ARIS TRI WAHYUDI; IMAN RUSMANA; ABDJAD ASIH NAWANGSIH
Biodiversitas Journal of Biological Diversity Vol. 19 No. 5 (2018)
Publisher : Society for Indonesian Biodiversity

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/biodiv/d190521

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Wiraswati SM, Wahyudi AT, Rusmana I, Nawangsih AA. 2018. TRFLP analysis for revealing the diversity of rice phyllosphere bacteria. Biodiversitas 19: 1743-1749. Phyllosphere environment of rice plant is usually inhabited by diverse bacteria which mostly contribute beneficial effects to the plant fitness. TRFLP method is a rapid and straightforward method to determine the bacterial diversity of many environments, including rice phyllosphere environment. This study aimed to analyze rice phyllosphere bacterial diversity of healthy rice plant cultivar Ciherang obtained from Sukabumi, Jasinga, and Situgede. The bacterial genomes were amplified and digested with two restriction enzymes, i.e., MspI and BstUI. The bacterial diversity (H’ index) and evenness (E index) were calculated from the peak value. From TRFs analysis, Betaproteobacteria and Pseudomonadales were dominantly found in nearly all samples with different relative abundance. In addition, Alphaproteobacteria and Gammaproteobacteria were also dominant in the several samples. The unique bacteria groups were inhabited in the sample from specific regions with certain growth phase. This finding informs us that the geographical factors might be more influent than the growth phase factor. Furthermore, the bacterial diversity and evenness of the metagenomic approach are higher than cultivation-dependent approach.
Screening and characterization of actinomycetes isolated from soybean rhizosphere for promoting plant growth UMI FATMAWATI; ANJA MERYANDINI; ABDJAD ASIH NAWANGSIH; Aris Tri Wahyudi
Biodiversitas Journal of Biological Diversity Vol. 20 No. 10 (2019)
Publisher : Society for Indonesian Biodiversity

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/biodiv/d201027

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Abstract. Fatmawati U, Meryandini A, Nawangsih AA, Wahyudi AT. 2019. Screening and characterization of actinomycetes isolated from soybean rhizosphere for promoting plant growth. Biodiversitas 20: 2970-2977. Actinomycetes which colonized plant rhizosphere has a vital role in improving plant growth by producing Indole-3-Acetic Acid (IAA). The aim of this study was to evaluate the potency of actinomycetes isolated from soybean rhizosphere as promoter agents for plant growth in vitro. Fifty actinomycetes isolates were successfully isolated from soybean rhizosphere. Based on the colorimetric methods, 35 isolates can produce IAA in various concentration, in the range of 0.46-30.6 mg/L. Seed germination assay using Ragdoll methods revealed that 26 isolates significantly promoted germination parameters, including the hypocotyl and the radicular length, the number of the lateral roots, and dry weight of the plant. Also, 14 from 26 isolates showed phosphate solubilizing activity in different phosphate-solubilizing index ranging from 1.25-2.62. Eight isolates were able to grow in N-free medium, indicating that these isolates have the ability in fixing nitrogen. Out of 23 from 26 isolates were detected to produce siderophore. All the tested isolates show chitinase production except ASR 55. Based on the observed parameters, it showed that there are four potential isolates (ASR 46, ASR 58, ASR 75 and ASR 76) as promising plant-growth promoters, phosphate solubilizer, nitrogen fixer, siderophore and chitinase producer. Based on the result of 16S rRNA sequence analysis, four potential isolates were identified as Streptomyces spp. in different taxa of strains and species.
Rice phyllosphere bacteria producing antifungal compounds as biological control agents of blast disease SRI MARTINA WIRASWATI; ABDJAD ASIH NAWANGSIH; IMAN RUSMANA; Aris Tri Wahyudi
Biodiversitas Journal of Biological Diversity Vol. 21 No. 4 (2020)
Publisher : Society for Indonesian Biodiversity

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/biodiv/d210401

Abstract

Abstract. Wiraswati SM, Nawangsih AA, Rusmana I, Wahyudi AT. 2020. Rice phyllosphere bacteria producing antifungal compounds as biological control agents of blast disease. Biodiversitas 21: 1273-1278. In vitro analysis of rice phyllosphere bacteria can be developed as biocontrol agents of blast disease using their antifungal activity. To prove the efficacy of bacterial isolates in reducing the severity of blast disease, a greenhouse experiment was conducted. Furthermore, antifungal compounds produced by potential bacterial isolate were also identified using Thin Layer Chromatography (TLC) and Liquid Chromatography-Mass Spectrometry/ Mass Spectrometry (LC-MS/MS) analysis. The application of seven rice phyllosphere bacterial isolates significantly reduced the severity of blast disease in rice (var: Ciherang). Surprisingly, the isolate STGG 14 is the most effective with 70.83% of blast disease reduction. Isolate STGG 14 has been identified as Bacillus subtilis subsp. subtilis which is known as various bioactive compounds producer. It was confirmed through identification of antifungal compounds produced by isolate STGG 14. The bioautography test shows that crude bioactive compounds from isolate STGG 14 could inhibit P. oryzae race 173. On the further analysis using LC-MS/MS, four bioactive compounds isolated from isolate STGG 14 were identified as moracin C, psoralen, 4,6-dimethyl-3 (4’-hydroxyphenyl) coumarin and xanthotoxin. All identified compounds except moracin C, belong to the coumarin group. According to the previous studies, among all compounds, psoralen and xanthotoxin displayed antifungal activity against several fungal pathogens.
Co-Authors ANJA MERYANDINI Aris Tri Wahyudi ARIS TRI WAHYUDI IMAN RUSMANA IMAN RUSMANA SRI MARTINA WIRASWATI SRI MARTINA WIRASWATI UMI FATMAWATI