scholarly journals Physiological changes and growth promotion induced in poplar seedlings by the plant growth-promoting rhizobacteria Bacillus subtilis JS

2018 ◽  
Vol 56 (4) ◽  
pp. 1188-1203 ◽  
Author(s):  
J. H. Jang ◽  
S. -H. Kim ◽  
I. Khaine ◽  
M. J. Kwak ◽  
H. K. Lee ◽  
...  
Keyword(s):  
Bacillus Subtilis ◽  
Plant Growth ◽  
Growth Promotion ◽  
Plant Growth Promoting Rhizobacteria ◽  
Physiological Changes ◽  
Plant Growth Promoting ◽  
Growth Promoting ◽  
Poplar Seedlings

scholarly journals Screening of plant growth-promoting rhizobacteria from maize (Zea mays) and wheat (Triticum aestivum)

2012 ◽  
Vol 12 (51) ◽  
pp. 6170-6185
Author(s):  
A Karnwal ◽  
Keyword(s):  
Acetic Acid ◽  
Bacillus Subtilis ◽  
Plant Growth ◽  
Root Elongation ◽  
Indole Acetic Acid ◽  
Growth Promotion ◽  
Plant Growth Promoting Rhizobacteria ◽  
Pot Experiments ◽  
Plant Growth Promoting ◽  
Growth Promoting

Plant growth-promoting rhizobacteria (PGPR) are free-living soil-borne bacteria that colonize the rhizosphere and have great importance in governing the functional property of terrestrial ecosystems. In this study, rhizospheric bacteria were isolated from maize and wheat and screened for their plant growth promoting activities. These isolates were identified as Pseudomonas , Bacillus , Azospirillum and Azotobacter species. All isolates were tested for their indole acetic acid (IAA) production ability. All isolates produce the varying amount s o f IAA ranging from 0.6- 2.7 μg/ml. The highest concentration of IAA was produced by bacterial strain Bacillus subtilis AK31. A series of growth pouch and pot experiments were conducted to study the effect of bacterial inoculants on the growth of maize and wheat. It was concluded that IAA plays a key role i n the growth promotion of roots in maize and wheat in growth pouch study. In maize, isolate AK1, AK21, AK31 and AK8 showed high indole acetic acid (6.86, 7.11, 7.11 and 7.36 pmol/ml, respectively) and root elongation activity ( 4.10, 5.00, 5.00 and 3.80 cm, respectively) after 96h of growth. In wheat, bacterial strains AK31, AK2, AK14, AK32 and AK15 showed high IAA ( 6.59, 5.66, 5.35, 7.53 and 5.66 pmol/ml, respectively) and root elongation ( 6.07, 4.00, 5.20, 6.90 and 5.20 cm, respectively) activity after 96h of growth. In pot experiments, Bacillus sp. AK21, Bacillus subtilis AK31, Azotobacter diazotrophicus AK14, Microbacterium sp. AK19 and Pseudomonas fluorescens AK32 showed effective results in term s of increase in root and shoot dry weight in maize (123, 130, 121, 120, 124g and 116, 126, 116, 114, 120g/pot, respectively) and wheat (130, 135, 125, 118, 140g and 105, 106, 110, 102, 110g/pot, respectively), in comparison to controls of maize and wheat crops. Thus, it might be concluded that PGPR strains AK21, AK31, AK14, AK19 and AK32 could be used as crop- enhancer and bio- fertilizer for production of maize and wheat .

Aplikasi Bacillus subtilis pada beberapa Bahan Organik terhadap Pertumbuhan dan Produksi Tanaman Cabai Rawit (Capsicum frutescens L.)

2020 ◽  
Vol 21 (1) ◽  
pp. 14-19
Author(s):  
Praptiningsih Gamawati Adinurani ◽  
Sri Rahayu ◽  
Nurul Fima Zahroh
Keyword(s):  
Bacillus Subtilis ◽  
Plant Growth ◽  
Plant Growth Promoting Rhizobacteria ◽  
Capsicum Frutescens ◽  
Plant Growth Promoting ◽  
Growth Promoting

Mikroba Bacillus subtilis merupakan agen pengendali hayati mempunyai kelebihan sebagai Plant Growth Promoting Rhizobacteria (PGPR) yaitu dapat berfungsi sebagai biofertilizer, biostimulan, biodekomposer dan bioprotektan. Tujuan penelitian mengetahui potensi B. subtilis dalam merombak bahan organik sebagai usaha meningkatkan ketersediaan bahan organik tanah yang semakin menurun. Penelitian menggunakan Rancangan Petak Terbagi dengan berbagai  bahan organik sebagai petak utama (B0 = tanpa bahan organik, B1 = kotoran ayam,  B2 = kotoran kambing, B3 = kotoran sapi) dan aplikasi B.subtilis sebagai anak petak (A0 = 0 cc/L, A1 = 5cc/L, A2 = 10 cc/L, Pengamatan meliputi variabel tinggi tanaman, indeks luas daun, jumlah buah per tanaman, berat buah per tanaman, dan bahan organik tanah. Data pengamatan  dianalisis ragam  menggunakan  Statistical Product and Service Solutions (SPSS) versi 25 dan dilanjutkan dengan uji Duncan untuk mengetahui signifikansi perbedaan antar perlakuan. Hasil penelitian menunjukkan tidak terdapat interaksi antara bahan organik kotoran ternak dan konsentrasi B. subtilis terhadap semua variabel pengamatan. Potensi B. subtilis sangat baik dalam mendekomposisi bahan organik yang ditunjukkan dengan peningkatan bahan organik, dan hasil terbaik pada kotoran  sapi (B3) dan konsentrasi B. subtilis 15 mL/L masing-masing sebesar 46.47 % dan 34.76 %. Variabel pertumbuhan tidak berbeda nyata kecuali tinggi tanaman dengan pertambahan tinggi paling banyak pada pemberian kotoran kambing sebesar 170.69 %.

scholarly journals Pengaruh Aplikasi Plant Growth Promoting Rhizobacteria terhadap Pertumbuhan dan Hasil Tanaman Bawang Merah (Allium cepa L. Aggregatum group)

Vegetalika ◽  
2020 ◽  
Vol 9 (4) ◽  
pp. 512
Author(s):  
Nanda Dwi Hafri ◽  
Endang Sulistyaningsih ◽  
Arif Wibowo
Keyword(s):  
Bacillus Subtilis ◽  
Plant Growth ◽  
Allium Cepa ◽  
Burkholderia Cepacia ◽  
Plant Growth Promoting Rhizobacteria ◽  
Bacillus Methylotrophicus ◽  
Plant Growth Promoting ◽  
Growth Promoting

Salah satu upaya penanganan penyakit moler bawang merah dilakukan melalui aplikasi Trichoderma. Aplikasi Trichoderma pada bawang merah memiliki beberapa keunggulan, yaitu mampu mensintesis hormon pertumbuhan tanaman. Terdapat jenis mikroba lain yang juga mampu meningkatkan fitohormon pada tanaman, yaitu Plant Growth Promoting Rhizobacteria (PGPR). Tujuan dari penelitian ini adalah untuk mengetahui dan menentukan isolat PGPR yang memiliki pengaruh paling baik terhadap pertumbuhan dan hasil bawang merah varietas Crok Kuning di lahan sawah. Penelitian ini menggunakan Rancangan Acak Kelompok Lengkap (RAKL) faktor tunggal dengan tiga blok sebagai ulangan. Faktor perlakuan yang digunakan adalah lima isolat PGPR, yaitu: Bp.25.7 Bacillus subtilis, BrSG.5 Bacillus amyloliquofaciens, Bp.25.2 Bacillus methylotrophicus, BrsM.4 Burkholderia cepacia, danBp.25.6 Bacillus amyloliquofaciens dengan dua kontrol, yaitu kontrol positif berupa Trichoderma dan kontrol negatif tanpa aplikasi perlakuan. Hasil penelitian menunjukkan bahwa pemberian perlakuan isolat Bp.25.2 Bacillus methylotrophicus pada bawang merah menyebabkan Laju Asimilasi Bersih (LAB) bawang merah lebih tinggi dibandingkan dengan pemberian perlakuan empat isolat PGPR lainnya maupun kontrol, tetapi sama baiknya dengan pemberian perlakuan Trichoderma. LAB yang tinggi menyebabkan Laju Pertumbuhan Tanaman (LPT) bawang merah dengan pemberian perlakuan Bp.25.2 Bacillus methylotrophicus yang lebih tinggi dibandingkan dengan BrSG.5 Bacillus amyloliquofaciens dan Bp.25.6 Bacillus amyloliquofaciens, tetapi sama baiknya dengan pemberian perlakuan dua isolat PGPR lainnya, kontrol, maupun Trichoderma. Pemberian aplikasi lima isolat PGPR sama baiknya dengan aplikasi Trichoderma dalam meningkatkan pertumbuhan tanaman bawang merah pada variabel luas permukaan daun dan bobot kering total dibandingkan kontrol. Peningkatan variabel pertumbuhan ini tidak diikuti oleh peningkatan variabel hasil dan produktivitas bawang merah tidak berbeda nyata antar perlakuan.

Rhizobium leguminosarum as a plant growth-promoting rhizobacterium: direct growth promotion of canola and lettuce

1996 ◽  
Vol 42 (3) ◽  
pp. 279-283 ◽  
Author(s):  
T. C. Noel ◽  
C. Sheng ◽  
C. K. Yost ◽  
R. P. Pharis ◽  
M. F. Hynes
Keyword(s):  
Acetic Acid ◽  
Plant Growth ◽  
Rhizobium Leguminosarum ◽  
Growth Promotion ◽  
Plant Growth Promoting Rhizobacteria ◽  
Plant Growth Promoting ◽  
Direct Growth ◽  
Early Seedling ◽  
Growth Promoting ◽  
Indole 3 Acetic Acid

Early seedling root growth of the nonlegumes canola (Brassica campestris cv. Tobin, Brassica napus cv. Westar) and lettuce (Lactuca saliva cv. Grand Rapids) was significantly promoted by inoculation of seeds with certain strains of Rhizobium leguminosarum, including nitrogen- and nonnitrogen-fixing derivatives under gnotobiotic conditions. The growfh-promotive effect appears to be direct, with possible involvement of the plant growth regulators indole-3-acetic acid and cytokinin. Auxotrophic Rhizobium mutants requiring tryptophan or adenosine (precursors for indole-3-acetic acid and cytokinin synthesis, respectively) did not promote growth to the extent of the parent strain. The findings of this study demonstrate a new facet of the Rhizobium–plant relationship and that Rhizobium leguminosarum can be considered a plant growth-promoting rhizobacterium (PGPR).Key words: Rhizobium, plant growth-promoting rhizobacteria, PGPR, indole-3-acetic acid, cytokinin, roots, auxotrophic mutants.

Colonization and growth promotion of outplanted spruce seedlings pre-inoculated with plant growth-promoting rhizobacteria in the greenhouse

2000 ◽  
Vol 30 (6) ◽  
pp. 845-854 ◽  
Author(s):  
Masahiro Shishido ◽  
Christopher P Chanway
Keyword(s):  
Plant Growth ◽  
Seedling Growth ◽  
Picea Glauca ◽  
Growth Promotion ◽  
Plant Growth Promoting Rhizobacteria ◽  
Population Declines ◽  
Growth Responses ◽  
Relative Growth Rates ◽  
Plant Growth Promoting ◽  
Growth Promoting

Seeds of two hybrid spruce (Picea glauca (Moench) Voss × Picea engelmannii Parry ex Engelm.) ecotypes were inoculated with one of six plant growth-promoting rhizobacteria (PGPR) strains previously shown to be able to stimulate spruce growth in controlled environments. The resulting seedlings were grown in the greenhouse for 17 weeks before outplanting at four reforestation sites. Inoculation with five of the six strains caused significant seedling growth promotion in the greenhouse, which necessitated analysis of relative growth rates (RGR) to evaluate seedling performance in the field. Four months after outplanting, most strains enhanced spruce shoot or root RGRs in the field, but seedling growth responses were strain specific. For example, Pseudomonas strain Ss2-RN significantly increased both shoot and root RGRs by 10-234% at all sites, but increases of 28-70% were most common. In contrast, Bacillus strain S20-R was ineffective at all outplanting sites. In addition, seedlings inoculated with four of the six strains had significantly less shoot injury than control seedlings at all sites. Evaluation of root colonization by PGPR indicated that bacterial population declines were not related to spruce growth response variability in the field. Our results indicate that once plant growth promotion is induced in the greenhouse, seedling RGR can increase by more than 100% during the first growing season in the field. However RGR increases of 21-47% were more common and may be more representative of the magnitude of biomass increases that can result from PGPR inoculation.

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