Isolasi dan Karakterisasi Bakteri Tanah Sawah di Kecamatan Medan Satria dan Bekasi Utara, Kota Bekasi, Jawa Barat

2017 ◽  
Vol 3 (4) ◽  
pp. 187 ◽  
Author(s):  
Arief Pambudi ◽  
Nita Noriko ◽  
Endah Permata Sari
Keyword(s):  
Plant Growth ◽  
Soil Bacteria ◽  
Rice Field ◽  
Plant Growth Promoting Rhizobacteria ◽  
Fertilizer Application ◽  
Rice Production ◽  
Production Costs ◽  
Soil Conditions ◽  
Nitrogen Fixation Activity ◽  
Growth Promoting

<p><em>Abstrak -</em><strong> </strong><strong>Produksi padi di Indonesia setiap tahun mengalami peningkatan, namun peningkatan ini belum mampu memenuhi kebutuhan nasional sehingga impor masih harus dilakukan. Salah satu masalah dalam produksi beras adalah penggunaan pupuk berlebih yang tidak hanya meningkatkan biaya produksi, namun juga merusak kondisi tanah. Aplikasi bakteri tanah sebagai Plant <em>Growth Promoting Rhizobacteria</em> (PGPR) dapat menjadi salah satu solusi terhadap masalah ini. Penelitian ini bertujuan untuk mengisolasi bakteri tanah dari 3 lokasi sawah daerah Bekasi, membandingkan keberadaan total bakteri pada ketiga lokasi tersebut,  dan melakukan karakterisasi isolat berdasarkan karakter yang dapat memicu pertumbuhan tanaman. Dari ketiga lokasi, diperoleh total 59 isolat dan 5 diantaranya berpotensi sebagai PGPR karena kemampuan fiksasi Nitrogen, melarutkan Fosfat, katalase positif, dan motil. Dari ketiga lokasi pengambilan sampel, BK1 memiliki jumlah total bakteri terendah karena aplikasi pemupukan dan pestisida berlebih yang ditandai tingginya kadar P total, serta tingginya residu klorpirifos, karbofuran, dan paration. Kondisi fisik tanah BK1 juga didominasi partikel liat yang menyebabkan tanah menjadi lebih padat. Peningkatan jumlah penggunaan pupuk tidak selalu diikuti peningkatan produktivitas tanaman.</strong></p><p> </p><p><strong><em>Kata Kunci</em></strong><strong><em> </em></strong>- <em>Bakteri tanah, Rhizosfer sawah, PGPR, Pupuk Hayati</em></p><p><strong> </strong></p><p><em>Abstract</em><strong> - </strong><strong>Rice production in Indonesia has increased annually, but this increase has not reached national demand,so imports still done. </strong><strong>One of the problems in rice production is the use of excessive fertilizers that not only increase production costs, but also decreased the soil conditions. The application of soil bacteria as Plant Growth Promoting Rhizobacteria (PGPR) can be the one solution to face this problem. The objective of this study was isolate soil bacteria from 3 locations of rice field in Bekasi, compare the total bacteria in the three locations, and characterize isolates based on the character that can promote plant growth. From three locations, a total of 59 isolates were obtained and 5 of them were potential as a PGPRs due to its Nitrogen fixation activity, Phosphate solubilization, positive catalase, and motility. From three sampling sites, BK1 has the lowest TPC value because of excessive  fertilizers and pesticides application which indicated by high total P levels, and also high chlorpyrifos, carbofuran and paration residues. The physical condition of BK1 soil is also dominated by clay particles which causes the soil more solid. Increasing of fertilizer application is not always followed by increased plant productivity.</strong></p><p><strong> </strong></p><p><strong><em>Keywords</em></strong> - <em>Biofertilizer, PGPR, Rice field rhizosphere, Soil Bacteria</em></p>

scholarly journals Molecular characterization of Plant Growth Promoting Rhizobacteria using 16S rRNA sequences in the organic rice field of Sukorejo Village, Central Java, Indonesia

2018 ◽  
Vol 19 (6) ◽  
pp. 2157-2162
Author(s):  
SLAMET SANTOSA ◽  
SUTARNO SUTARNO ◽  
EDI PURWANTO ◽  
SURANTO SURANTO ◽  
SAJIDAN SAJIDAN
Keyword(s):  
16S Rrna ◽  
Plant Growth ◽  
Rice Field ◽  
Plant Growth Promoting Rhizobacteria ◽  
Organic Rice ◽  
Central Java ◽  
Plant Growth Promoting ◽  
Growth Promoting ◽  
Rrna Sequences ◽  
16S Rrna Sequences

Santosa S, Sutarno, Purwanto E, Suranto, Sajidan. 2018. Molecular characterization of Plant Growth Promoting Rhizobacteria using 16S rRNA sequences in the organic rice field of Sukorejo Village, Central Java, Indonesia. Biodiversitas 19: 2157-2162. Plant Growth Promoting Rhizobacteria (PGPR) are rhizosphere bacteria that can be utilized to increase plant growth and suppress plant diseases. PGPR concentrate on the concept of sustainable agriculture due to their role as biostimulant by synthesizing and regulating the concentration of various phytohormones and as biofertilizers. It is important to determine the original PGPR found in the roots of rice plants. This study aimed to identify PGPR based on 16S rRNA sequences. The bacterial strain was isolated from the rhizospheric soil of IR 64 organic and inorganic rice fields in the region of Sragen District, Central Java, Indonesia. The bacterial isolates were grown on the Luria Bertani (LB) Agar Medium. There were 10 colonies obtained with different morphological variations, nine of those were from the organic rice field. Molecular characterization using 16R rRNA sequences suggested the identity the nine isolates were of Pseudomonas aeruginosa strain RI-98-1, Stenotrophomonas maltophilia strain S431, Bacillus subtilis strain CEB2, Bacillus cereus strain ATCC 14579 clone EA195, S. maltophilia strain 5517, Exiguobacterium acetylicum strain SSA-3, Serratia nematodiphila strain HC4, Bacillus cereus strain ANP221, and Acinetobacter junii strain M. pstv. 21.4 Pseudomonas and Bassilus produce phytohormones (auxins) and convert inorganic phosphate to organic and Stenotropomonas can increase the growth of Acinetobacter and Exigobacterium as phosphate solvents in the soil.

A novel procedure for rapid isolation of plant growth promoting pseudomonads

1995 ◽  
Vol 41 (6) ◽  
pp. 533-536 ◽  
Author(s):  
Bernard R. Glick ◽  
Damir M. Karaturovíc ◽  
Peter C. Newell
Keyword(s):  
Plant Growth ◽  
Soil Bacteria ◽  
Acc Deaminase ◽  
Plant Growth Promoting Rhizobacteria ◽  
Bacterial Strains ◽  
Seedling Root ◽  
N Source ◽  
Plant Growth Promoting ◽  
Promote Plant Growth ◽  
Growth Promoting

A rapid and novel procedure for the isolation of plant growth promoting rhizobacteria (PGPR) is described. This method entails screening soil bacteria for the ability to utilize the compound 1-aminocyclopropane-1-carboxylate (ACC) as a sole N source, a trait that is a consequence of the presence of the activity of the enzyme ACC deaminase. This trait appears to be limited to soil bacteria that are also capable of stimulating plant growth. Seven different soil samples from two geographically disparate locations were found to contain pseudomonads that were able to to utilize ACC as a N source. Each of the seven strains was shown, by the ability of the bacterium to promote canola seedling root elongation under gnotobiotic conditions, to be a PGPR. The method described here may be used to replace the otherwise slow and tedious process of testing individual bacterial strains for their ability to promote plant growth, thereby significantly speeding up the process of finding new PGPR.Key words: plant growth promoting rhizobacteria, PGPR, 1-aminocyclopropane-1-carboxylate, ACC, ACC deaminase, bacterial fertilizer, soil bacteria.

Effects of root colonizing bacteria on nodulation of soybean roots by Bradyrhizobium japonicum

1987 ◽  
Vol 33 (6) ◽  
pp. 498-503 ◽  
Author(s):  
D. R. Polonenko ◽  
F. M. Scher ◽  
J. W. Kloepper ◽  
C. A. Singleton ◽  
M. Laliberte ◽  
...  
Keyword(s):  
Plant Growth ◽  
Aeromonas Hydrophila ◽  
Bradyrhizobium Japonicum ◽  
Soil Bacteria ◽  
Plant Growth Promoting Rhizobacteria ◽  
Field Soil ◽  
Plant Growth Promoting ◽  
Glycine Max L ◽  
Soybean Roots ◽  
Growth Promoting

Eighteen strains of soybean root colonizing soil bacteria were tested for interference with nodulation of soybeans (Glycine max (L.) Merrill) grown in a field soil – perlite mix or in a soil-less planting medium. Seventeen of the strains were identified as Pseudomonas fluorescens or Pseudomonas putida and one as Aeromonas hydrophila. All strains colonized soybean roots at levels of log 3.9 to 5.7 cfu/g root. Although nine strains increased significantly the weights of nodules formed by Bradyrhizobium japonicum 110 on soybeans grown in the soil–perlite mix, numbers of nodules increased in only three treatments. Significant increases in nodule numbers were not observed when the soil bacteria were tested with B. japonicum 118, and only two treatments increased nodule weights when compared with the controls. One of the 18 treatments increased and 1 decreased significantly the dry weights of shoots of plants inoculated with B. japonicum 110 and grown in the soil-less mix. Only one treatment reduced the dry weights of roots. Several strains stimulated increases in the dry weights of shoots and roots of plants inoculated with B. japonicum 118, but these effects were not correlated with changes in nodule numbers or weights. The results suggest that root colonizing bacteria generally do not interfere with the ability of B. japonicum to form nodules in soybean roots and that certain strains may actually enhance nodulation and plant growth. The relevance of these results for the development of improved Bradyrhizobium inoculant products by the addition of selected plant growth promoting rhizobacteria is discussed.

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